Subjects -> CHEMISTRY (Total: 928 journals)
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    - PHYSICAL CHEMISTRY (65 journals)

INORGANIC CHEMISTRY (45 journals)

Showing 1 - 36 of 36 Journals sorted alphabetically
Acta Polymerica     Hybrid Journal   (Followers: 9)
Additives for Polymers     Full-text available via subscription   (Followers: 20)
Advances in Inorganic Chemistry     Full-text available via subscription   (Followers: 10)
Advances in Polymer Technology     Open Access   (Followers: 13)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 5)
Bioinorganic Chemistry and Applications     Open Access   (Followers: 5)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 1)
Communication in Inorganic Synthesis     Open Access  
European Journal of Inorganic Chemistry     Hybrid Journal   (Followers: 11)
European Polymer Journal     Hybrid Journal   (Followers: 43)
High Performance Polymers     Hybrid Journal   (Followers: 1)
Indian Journal of Chemistry - Section A     Open Access   (Followers: 9)
Inorganic and Nano-Metal Chemistry     Hybrid Journal  
Inorganic Chemistry     Hybrid Journal   (Followers: 33)
Inorganic Chemistry Communications     Hybrid Journal   (Followers: 14)
Inorganic Chemistry Frontiers     Hybrid Journal   (Followers: 4)
Inorganic Materials     Hybrid Journal   (Followers: 6)
Inorganic Materials: Applied Research     Hybrid Journal   (Followers: 1)
Inorganica Chimica Acta     Hybrid Journal   (Followers: 6)
Inorganics     Open Access   (Followers: 1)
International Journal of Bio-Inorganic Hybrid Nanomaterials     Open Access   (Followers: 5)
International Journal of Inorganic Chemistry     Open Access   (Followers: 3)
JBIC Journal of Biological Inorganic Chemistry     Hybrid Journal   (Followers: 2)
Journal of Inorganic and Organometallic Polymers and Materials     Hybrid Journal   (Followers: 8)
Journal of Inorganic Biochemistry     Hybrid Journal   (Followers: 3)
Journal of Inorganic Chemistry     Open Access   (Followers: 4)
Journal of Polymers and the Environment     Hybrid Journal   (Followers: 1)
Journal of Progressive Research in Chemistry     Open Access   (Followers: 2)
Journal of Separation Science     Hybrid Journal   (Followers: 5)
Materials Today Chemistry     Hybrid Journal   (Followers: 2)
Open Journal of Inorganic Chemistry     Open Access   (Followers: 1)
Polymer Bulletin     Hybrid Journal   (Followers: 8)
Polymer Composites     Hybrid Journal   (Followers: 17)
Russian Journal of Inorganic Chemistry     Hybrid Journal  
Separation Science plus (SSC plus)     Hybrid Journal   (Followers: 1)
Zeitschrift für anorganische und allgemeine Chemie     Hybrid Journal   (Followers: 1)
Similar Journals
Journal Cover
Journal of Polymers and the Environment
Journal Prestige (SJR): 0.562
Citation Impact (citeScore): 2
Number of Followers: 1  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1566-2543 - ISSN (Online) 1572-8919
Published by Springer-Verlag Homepage  [2468 journals]
  • Synthesis and Characterization of PEGylated Poly(Glycerol Azelaic Acid)
           and Their Nanocomposites for Application in Tissue Engineering

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      Abstract: In this study, new types of bio-copolymers based on Poly(glycerol azelaic acid) (PGAZ) and Poly(ethylene glycol) (PEG) (Mn=400, 1000, and 2000 gmol−1) were synthesized by melt polycondensation technique. Also, the solution casting method prepared their nanocomposites with 5 wt% of bioactive glass nanoparticles (BG). 1H-NMR and FTIR analysis confirmed that the pre-polymer resins were well synthesized. Crystalline plan (002) of PGAZ-co-PEG1000 and PGAZ-co-PEG2000 are increased compared to other samples. The SEM images of the surface of the samples showed that the increase in the molecular weight of PEG has made the surface morphology rougher, and the presence of nanoparticles causes a layered morphology. Also, the increase in molecular weight in PEG has caused better dispersion of nanoparticles. Among all the samples, the mechanical properties of PGAZ-co-PEG2000/BG were higher than others. The glass transition temperature (Tg) for the PGAZ sample is around 42.16 oC, and by copolymerizing this material with PEG, the Tg values have moved to lower temperatures. The degradation behaviour of PGAZ-co-PEG1000 and its nanocomposites was faster in fetal bovine serum (FBS) moiety. The dynamic contact angle showed that sample PGAZ-co-PEG400 showed the best hydrophilic conditions, and on the other hand, the PGAZ/BG sample behaved better among the nanocomposite samples. The behaviour of cytotoxicity after 72 h showed that the samples PGAZ-co-PEG400/BG and PGAZ-co-PEG2000/BG had better cell maintenance and proliferation. Cell adhesion is more on the surface of nanocomposite samples, and the acridine orange technique also showed that after 16 days, there are cells with very high density on the surface of bio-copolymer nanocomposite samples. Graphical
      PubDate: 2024-02-16
       
  • Understanding the Interaction Between Gelatin and a Layered Silicate and
           

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      Abstract: Abstract Laponite® (Lap) is a synthetic layered nanoclay that is considered a potential candidate for improving the physicochemical properties of gelatin films. However, there is limited information in the literature about the interaction between Lap platelets and gelatin chains and its impact on the physicochemical film properties. Therefore, the current research aimed to systematically study the mechanism of interaction and the effect of Lap on the physicochemical properties of gelatin films (moisture content, optical properties, water contact angle, surface energy, water adsorption, water solubility, water vapor permeability, and mechanical properties). Furthermore, gelatin films with Lap were applied as UV-barrier materials in grape juice. Gelatin films were produced by casting method containing 0, 3, 5, 10, and 15% of Lap (based on the weight of the biopolymer). The incorporation of Lap reduced the formation of the gelatin triple helix structure and consequently film crystallinity. Hydrogen bonds and electrostatic interactions could be the principal interactions between gelatin/glycerol/Lap. The incorporation of Lap increased the thickness and moisture content. Lap platelets were completely exfoliated and did not modify the color and opacity of the gelatin films. The UV-barrier capacity of the gelatin films was improved with the incorporation of Lap. Gelatin films with 15% Lap exhibited a transmittance decreases of 86% and 5% in ultraviolet (280 nm) and visible (470 nm) light, respectively. Furthermore, a reduction of 29% in film water solubility was observed with 15% Lap. Other properties such as water contact angle, surface free energy, water vapor permeability, and mechanical properties were not modified by the incorporation of Lap. Gelatin films containing Lap (15%) reduced the degradation of anthocyanins (50%) in grape juice exposed to UV light when compared with samples covered with gelatin films without Lap.
      PubDate: 2024-02-08
       
  • Green Synthesis of Nanochitosan/Bentonite/SnO2–ZnO Bionanocomposite for
           

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      Abstract: Abstract Biotreatment of wastewater has attracted considerable attention due to its low cost and eco-friendliness. This study developed a novel bionanocomposite comprised of Nanochitosan (NCS), Bentonite (Bt), and SnO2–ZnO nanocomposite prepared using Salvia officinalis extract as a reducing/stabilizing agent. The NCS/Bt/SnO2–ZnO bionanocomposite exhibited a rough surface with porous nature. EDX, XRD, and FTIR results confirmed the formation of the bionanocomposite. TGA indicated high thermal stability of the NCS/Bt/SnO2–ZnO. DRS results revealed that the bionanocomposite had a band gap of 2.60 eV. The surface area of NCS/Bt/SnO2–ZnO was found to be 32.54 m2 g−1 with a 17.98 nm pore size. Adsorption of Fe(III) and Pb(II) ions and photocatalytic degradation of methylene blue (MB) dye using this bionanocomposite were studied. Under optimal conditions, the highest removal of Fe(III) (99.5%) and Pb(II) (91.5%) was achieved after 5 min and 40 min, respectively. The adsorption data fitted the Langmuir isotherm and indicated the removal capacity of 555.55 and 243.90 mgg−1 for Fe(III) and Pb(II), respectively. Also, the NCS/Bt/SnO2–ZnO showed the MB dye degradation efficiency of 99% within 30 min. Therefore, the NCS/Bt/SnO2–ZnO can be used as an environmentally friendly, cost-effective, thermally stable, and high-performance adsorbent/photocatalyst to remove heavy metal ions and dye molecules.
      PubDate: 2024-02-08
       
  • Preparation and Characterization of Cinnamon–Clove Compound Essential
           Oil Microcapsules/Graphene Oxide/Polyvinyl Alcohol/Polylactic Acid
           Composite Films for White Beech Mushrooms Packaging

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      Abstract: This work developed a novel, environmental, and safe cinnamon–clove compound essential oil microcapsules/graphene oxide/polyvinyl alcohol/polylactic acid (CCCEOM/GO/PVA/PLA) composite films for the fresh-keeping packaging of white beech mushrooms and investigated the effects of essential oils and nano-fillers on prolonging food shelf life. Herein, PVA and PLA were blended to reduce the water solubility and improve the mechanical properties of the composites. The lamellar GO, a nucleating agent, was prepared using the modified Hummer method. Clove and cinnamon essential oils have been blended to obtain composite essential oils with better antibacterial activity and encapsulated in beta-cyclodextrin (β-CD) to produce CCCEOM, a sustained-release antibacterial agent. The CCCEOM/GO/PVA/PLA composites were fabricated by integrating GO and CCCEOM into the PVA/PLA matrix, and the morphology, water solubility, optical properties, mechanical properties, thermal stability, and oxygen permeability of the composites were characterized. It was found that the composites demonstrated significant antibacterial activity against Mucor and Aspergillus niger, low water solubility (0.009%), high light transmittance (84.63%), as well as excellent tensile strength (42.29 MPa), and oxygen transmission rate (82.65 cm3/(m2·24 h·0.1 MPa)) with the addition of 0.20 wt% GO and 10 wt% CCCEOM. Moreover, the results of the preservation experiment demonstrate that it can also maintain the quality of white beech mushrooms to some extent and prolong their shelf life for 4 days at 4 °C, which also provides support for their application in food packaging. Graphical
      PubDate: 2024-02-07
       
  • Development of 3D-Printed PCL/ Baghdadite Nanocomposite Scaffolds for Bone
           Tissue Engineering Applications

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      Abstract: Abstract A significant obstacle in bone tissue engineering is the creation of biodegradable bone replacements with the requisite mechanical and biological capabilities to treat more severe and intricately shaped injuries. Baghdadite has recently indicated that active biological ions such as silicon (Si4+) and zirconium (Zr4+) have been proven to increase bone growth considerably. In this study, we produced 3D-printed PCL-based scaffolds containing different amounts of Baghdadite using the robocasting solvent technique. Notably, PCL with 40 and 60 wt.% Baghdadite scaffolds (PB40 and PB60) promoted a more biomimetic environment for in vitro bone growth as their proper bioactivity and cell viability results were obtained without the addition of osteoinductive components. The printing process produced 3D scaffolds with a compressive strength of 7.94 MPa and elastic modulus of 29.95 MPa in PB40. According to the analytical prediction models in PB40, the elastic modulus was 24.7 and 26.89 MPa. Also, adding 60 wt.% Baghdadite increased the degradation rate to 5.1% in two months, more than six times that of PCL-based scaffolds. Cell proliferation assay demonstrated that the optical density of MG63 cells after 7 days of culture increased from 1.43 ± 0.03 to 1.82 ± 0.20 in PB40 as compared to pure PCL scaffold. Furthermore, bioactivity evaluation, ion release assessment, and morphological observation results further revealed that incorporating Baghdadite into a 3D-printed PCL-based scaffold could improve bone regeneration. Our findings demonstrate that the PCL/Baghdadite composite scaffold may be efficiently manufactured using 3D-printing technology and is extremely promising for bone tissue engineering applications.
      PubDate: 2024-02-06
       
  • Bioinspired Self-Assembly Polymer Based on Nucleobase for Enhanced Oil
           Recovery

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      Abstract: Abstract Polymer flooding is one of the most effective tertiary oil recovery technologies, which can significantly improve the sweep efficiency of the reservoir by injecting high-viscosity polymer solution. However, Conventional polymers are difficult to inject, easy to degrade after shearing, cause plugging in low-permeability reservoirs, functional monomers have potential environmental pollution risks, and limit its industrial application. In recent years, more and more attention has been paid to the development of adaptive supramolecular oil displacement materials from bio-based materials. Here, the bases of guanine and cytosine from ribonucleic acid are grafted onto polyacrylamide. With a multi-supramolecular interactions through synergistic hydrogen bonding and hydrophobic interactions, HPAM-C≡G-HPAM with excellent injectivity and high viscosity are developed to improve the recovery of low permeability reservoirs. Subsequently, HPAM-C≡G-HPAM was characterized by FT-IR, NMR, ESEM and DLS. The rheological test results show that the tackifying ability of the supramolecular system is much higher than that of polyacrylamide with the same molecular weight and has excellent shear resistance. In the laboratory core displacement experiment, the injection pressure of HPAM-C≡G-HPAM in low permeability core is only 1/3 of that of polyacrylamide with the same viscosity, and the oil recovery can be increased by 16.31%, The oil recovery can be increased by 10% under high temperature and high salinity conditions. Accordingly, HPAM-C≡G-HPAM has the potential to greatly enhance oil recovery in low permeability reservoirs.
      PubDate: 2024-02-05
       
  • QPCR-Guided Screening of Levansucrase: Levan Characterization and Genomic
           Insights

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      Abstract: Abstract Eighty-seven bacteria isolates were screened for the presence of the levansucrase encoding gene and those possessing the gene were used in gene expression studies and the production of levan. Based on both screening methods, isolate P19-1 was determined as the producer bacterium with the highest amounts of levan. Whole genome sequencing was done to characterize the isolate and determine its genomic potential. Both its 16 S rRNA and genome were closest to Chromohalobacter salexigens. The levansucrase gene and genes suggesting a versatile carbohydrate and nitrogen metabolism were annotated. A secondary metabolism suggestive of a possible new role in promoting plant growth in hypersaline environments was revealed. The chemical structure analysis of the produced polymer was confirmed by comparison with commercial pure Erwinia herbicola levan. Also, C. salexigens levan showed high biocompatibility. Overall, this is a practical molecular approach that will help researchers to effectively screen microbes with levan production potential.
      PubDate: 2024-02-05
       
  • Enhancing the Sustainability of Poly(Lactic Acid) (PLA) Through
           Ketene-Based Chain Extension

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      Abstract: The widespread utilization of nonrenewable fossil-based polymers has led to significant environmental damage. Bio-based Poly(lactic acid) (PLA) has garnered substantial academic and industrial interest in the last two decades due to its advantageous characteristics for food packaging applications. Nonetheless, the improper disposal of PLA continues to contribute to the plastic waste problem. PLA recycling mainly involves thermal processes, facing challenges due to PLA’s limited stability. This study aims to enhance PLA’s molecular weight and melt viscosity by using chain extenders to increase its degree of branching. A modular chain extender capable of thermally forming highly reactive ketene intermediates is employed to react with PLA’s hydroxyl and carboxyl end groups in a single step. For this purpose, copolymers of styrene and 2,2,5-trimethyl-5-(4-vinylbenzyl)-1,3-dioxane-4,6-dione were synthesized using free radical polymerization and characterized through 1H-NMR, TGA, and DSC analyses. The chemical interaction between these chain extenders and molten PLA was also explored, resulting in increased PLA molecular weight and higher melting temperature (Tm), reaching 155.1 for PLA_2.5CE2. Additionally, the branching introduced through this process led to a notable increase in the UV absorption of PLA, suggesting potential applications in the packaging industry. The chemical tunability of this functional ketene-based chain extender holds promise for tailoring PLA’s structure for diverse applications, further advancing its sustainability and utility. Graphical
      PubDate: 2024-02-03
       
  • Biodegradable Conducting PVA-Hydrogel Based on Carbon Quantum Dots: Study
           of the Synergistic Effect of Additives

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      Abstract: Conductive hydrogels are becoming one of the most important milestones for the development of new scaffolds, biosensors, supercapacitors, and green electronics within the field of biomedicine. In this work, we study the effect of different types of electroactive additives such as poly(3,4-ethylenedioxythiophene), tannic acid, and carbon quantum dots (CQDs), to form different poly(vinyl alcohol) (PVA)-based hydrogels with enhanced electrochemical properties. Different physicochemical tests are carried out to characterize the different PVA-based hybrid hydrogels and the rates of their degradation and loss of electroactivity throughout an eight-week biodegradation process. This work shows the individual and synergistic effects of the additives on various mechanical properties, including storage modulus and swelling ratio, and electrochemical properties of the PVA hydrogel. The additives have proven to enhance the electroactivity of the PVA-based hydrogels but as well their degradation. Finally, the use of the new hydrogel as a pressure sensor is also investigated. The study provides an insight on the potential use of CQDs, in synergy with other electroactivity enhancers, in the fabrication of novel hybrid conducting hydrogels in green electronics. Graphical
      PubDate: 2024-02-03
       
  • Development of Microstructured Chitosan Nanocapsules with Immobilized
           Lipase

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      Abstract: This study developed three microstructured chitosan nanocapsules with immobilized lipase to explore chitosan-lipase interactions at different pH levels. Chitosan undergoes complete protonation or deprotonation based on pH level. Three distinct pH levels were examined: 5.5, where chitosan is fully protonated; 6.5, where chitosan is partially protonated/deprotonated; and 7.5, where chitosan is fully deprotonated. The nanocapsules exhibited nanoscale dimensions and the microstructures showed porous morphology. Immobilized lipase showed improved temperature stability, compared to free enzyme, especially in lipase supports at pH 5.5 and 7.5 due to electrostatic and hydrophobic interactions. The interactions between chitosan and lipase influenced the microenvironment around the active site, resulting in an optimum pH of 8 for all supports. Immobilized lipase at pH 5.5 and 7.5 displayed the best reusability in the hydrolysis of p-nitrophenyl palmitate under reaction conditions of 37 °C and pH 8. During refrigeration storage, all immobilized lipases maintained total activity for 7 days, but lipase immobilized at pH 6.5 maintained more the activity after 28 days. Therefore, this study has developed promising immobilized lipase, standing out not only for industrial application concerning cost-effectiveness, but also for the innovation in investigating the influence of chitosan-lipase interactions during immobilization. Graphical
      PubDate: 2024-02-03
       
  • The Impact of Temperature on the Formation, Release Mechanism, and
           Degradation of PLGA-based In-Situ Forming Implants

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      Abstract: This study explores the impact of varying temperatures on the release behavior of Triptorelin Acetate (TA) from a PLGA-based in-situ forming implant (ISFI) and polymer degradation. Formulations were prepared using the in situ forming method in an acetate buffer (pH = 6.8) and then exposed to temperatures of 4 to 60 °C. The drug release and polymeric depot behavior were evaluated using HPLC, SEM, GPC, Rheometer, and pH measurements. A modified Gallagher-Corrigan Model-based mathematical model was applied to fit the in-vitro data, and the activation energy for peptide release in diffusional and erosional phases was calculated using the Arrhenius equation. The results revealed that matrices formed at 37, 45, and 53 °C exhibited a highly porous structure, resulting from rapid phase inversion and surface pore closing. This led to a reduction in TA burst release, observed as 38%, 27%, and 15% at 37 °C, 45 °C, and 53 °C respectively. Conversely, matrices at 4 and 25 °C demonstrated a faster initial release, followed by the formation of dense structures. The accelerated drug release profiles at 45 and 53 °C showed a shortened ultimate drug release duration and a good correlation with the real-time results at 37 °C. Due to the discernible PLGA matrices degradation at different temperatures, biphasic and tri-phasic release patterns were observed. The experimental release results aligned well with the proposed mathematical model, and the drug release kinetic parameters were estimated. Thus, in in-vitro studies, the release medium temperature plays a significant role in the drug-release behavior of ISFIs. Graphical
      PubDate: 2024-02-03
       
  • Novel Fluoroboric Acid Additive for Blend Membrane to be Used in PEM Fuel
           Cell, Characterization Studies, and Performance Test

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      Abstract: This study focuses on developing an alternative membrane for PEMFC due to the disadvantages of using Nafion. Fluoroboric acid (FBA) was used as an additive material to SPEEK-PVA blend membranes at different weight ratios (1%, 5%, 7.5%, 10%, and 12.5%), and a synthesis procedure was carried out with the solution-casting. Thermal crosslinking was performed with all membranes. Utilizing FBA, with its highly electronegative fluorine groups, is a novel approach expected to enhance proton conductivity. The structural, morphological, and thermal properties of the synthesized membranes were determined by FTIR, XRD, SEM, TGA-DTG, and DSC. Water uptake capacity (WUC), swelling property, area change, dynamic mechanical analysis, ion exchange capacity (IEC), AC impedance analysis, hydrolytic stability, and oxidative stability analyses were performed for fuel cell applications. Although FBA does not have a crystal structure, the synergy it created with the SPEEK-PVA membrane increased the crystallinity of the membrane and, accordingly, glass transition temperature. SEM images of membranes at a ratio above 7.5% show that agglomerations occur in the structure and this is supported by other analyses. It was determined that the membrane composition with the highest WUC (16.44%), IEC (1.55 meq/g), and proton conductivity (0.57 S/cm) values contained 7.5% FBA from the characterization studies, and a single-cell performance test was actualized with this. 418 mA/cm2 current density and 250.8 mW/cm2 power density were obtained at 0.6 V cell potential, with the membrane containing 7.5% FBA. This study shows that the synthesized membrane, especially the FBA, is a promising option for PEMFC application. Graphical
      PubDate: 2024-02-01
       
  • Strategy for the Preparation of PBAT/Starch Blended Foam with High
           Resilience and Shrinkage Resistance

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      Abstract: Abstract Poly (butylene adipate-co-terephthalate) (PBAT), a biodegradable polyester, has gained increasing research interest. Foam polymers based on PBAT have demonstrated high potential for various applications. Here, we propose a novel method for blending foam made of starch and PBAT. Melt blending was used to create PBAT/starch blends, and batch supercritical CO2 autoclave foaming was used to create polymer foams. We looked into the mechanical characteristics, crystallization, and dispersion morphology of PBAT/starch mixes. The structure, together with the anti-shrinkage and compressive strengths of PBAT/starch foams were investigated. The findings demonstrate that starch can be more effectively incorporated into the PBAT matrix with the aid of polyol (glycerol) and that the addition of starch with specific quantities can create a clear bimodal-like cell structure, thus increasing the matrix's rigidity and lessen the shrinkage issue with PBAT foam, resulting in foam with good compression resilience. The largest expansion ratio, 19, the least shrinking, and outstanding compression resilience were found in the 70/30 mixture of PBAT and starch. It provides a broadly applicable method for possible large-scale manufacture of biodegradable polyester foams with anti-shrinkage and high compression resilience.
      PubDate: 2024-01-30
       
  • Bio-Based Poly(butylene 2,5-thiophenedicarboxylate-co-butylene
           4,4′-biphenyldicarboxylate) with Excellent Ultraviolet Shielding
           Properties and Barrier Properties

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      Abstract: Abstract To improve the glass transition temperature and ultraviolet shielding properties of poly(butylene 2,5-thiophenedicarboxylate) (PBTF), a series of poly(butylene 2,5-thiophenedicarboxylate-co-butylene 4,4′-biphenyldicarboxylate) (PBTFBs) were synthesized from 2,5-thiophenedicarboxylic acid (TDCA), 1,4-butanediol (BDO), and dimethyl 4,4′-biphenyldicarboxylate (BDD). The composition and molecular weights of PBTFBs were investigated by 1H NMR, .13C NMR and GPC. The results showed that the glass transition temperature of PBTFBs gradually increased, and the thermogravimetric analysis results also showed that the thermal stability gradually increased with increasing the BDD content. Compared with PBTF, the polyester with 40% butylene 4,4′-biphenyldicarboxylate unit (PBTFB40) showed a higher Young’s modulus (1166.8 MPa) and tensile strength (25.8 MPa). In addition, the ultraviolet (UV) shielding ability of PBTF was greatly enhanced, and the UV transmittance at 350 nm decreased from 19.66% (PBTF) to 6.22% (PBTFB30). The average transmittance at wavelengths of 320–400 nm decreased from 26.25 to 15.20%. The gas permeability coefficient of CO2 decreased from 0.3120 barrer to 0.0321 barrer. Because the biphenyl structure was successfully introduced into PBTF, the rigidity of the chain segment was improved, and excellent thermal stability, mechanical properties and UV shielding properties were obtained. PBTFB30 has potential application in outdoor products.
      PubDate: 2024-01-30
       
  • Sustainable Production of Hierarchically Porous Carbon from Lignin-Acrylic
           Acid Copolymers

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      Abstract: Abstract Microporous carbon adsorbents with high surface area and porosity were synthesized from lignin using an acrylic acid pretreatment strategy. Lignin was grafted with acrylic acid via hydrothermal treatment to introduce carboxyl groups, as verified by NMR and FT-IR spectroscopy. The incorporated carboxyls enabled ion exchange reactions between lignin and potassium during subsequent potassium hydroxide (KOH) activation. This optimized the dispersion of potassium, allowing effective activation even at low KOH levels. The effects of process parameters, including acrylic acid content, hydrothermal time, and KOH ratio, were investigated. Optimal conditions of 5 wt% acrylic acid and 6 h hydrothermal reaction produced a carbon adsorbent with exceptional Brunauer–Emmett–Teller (BET) surface area of 1708 m2/g and pore volume of 0.82 cm3/g at a lignin:KOH:acrylic acid ratio of 1:0.5:0.05. Characterization by FE-SEM, XRD, EDS, and Raman spectroscopy confirmed the successful synthesis of an optimized microporous carbon material. The carbon exhibited an outstanding lead ion adsorption capacity of 371 mg/g by Langmuir modeling. Adsorption kinetics followed pseudo-second-order, indicating chemisorption as the rate-controlling step. Thermodynamic analysis revealed the endothermic nature of lead adsorption, further enhanced at higher temperatures. Overall, the acrylic acid pretreatment approach enabled sustainable production of high surface area microporous carbon adsorbents from lignin using minimal KOH activation. The adsorbents demonstrated tremendous potential for removing lead ions via chemisorption mechanisms.
      PubDate: 2024-01-29
       
  • Rare Earth Metal Ions Adsorption Using
           2-[2-Oxo-2-(1-pyrrolidinyl)ethoxy]acetic acid/Sodium Alginate Gel

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      Abstract: Abstract In this research, adsorbents synthesized from natural sodium alginate polymers incorporated with varying concentrations of 2-[2-oxo-2-(1-pyrrolidinyl)ethoxy]acetic acid (PYRDGA) were investigated. Analyses of adsorption properties indicated that the pristine sodium alginate gel (SAG) demonstrated adsorption capacities of 222.4, 202.6, 199.1 and 398.0 mg g−1 for La, Gd, Y, and Sc, respectively. The composite gel infused with PYRDGA at a 1:1 ratio exhibited adsorption values of 278.2, 270.6, 283.2 and 374.9 mg g−1 for the same elements. Across all synthesized gels, an optimal pH of 5 was identified for the adsorption of rare earth element (REE)3+ ions. The introduction of the extractant PYRDGA notably reduced the gel's selectivity towards Cu, Pb, Cd, and Cr. Spectroscopic analyses highlighted the critical involvement of C=O and C–O functional groups in the adsorption mechanisms. Kinetic assessments suggested the applicability of R–P model, inferring that the rare earth ions' adsorption onto the gels could be characterized by uniform or non-uniform monolayer surface adsorption. Furthermore, thermodynamic evaluations were conducted for various gels against REE3+ ions at 298.15 K. Among the eluents analyzed, the most efficient recovery of REE3+ was observed with 0.1 M HCl/CaCl2。
      PubDate: 2024-01-29
       
  • Preparation of 3D Cellulose-Carbon Quantum Dots Hydrogels for Adsorption
           of Mercury from Aqueous Solution

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      Abstract: Abstract Hydrogels with high mechanical properties and excellent adsorption capacity are expected in wastewater treatment. Herein, 3D porous hydrogels were prepared by free radical copolymerization using carboxymethyl cellulose nanofibers (CNFs) grafted with N, S atom doped carbon quantum dots (N, S-CDs) and 1-Allyl-2-thiourea. N, S-CDs introduced in the hydrogel can uniformly disperse and increase the adsorption site of Hg(II) by grafting method. Meanwhile, the good mechanical strength of N, S-CDs is beneficial to improve the hydrogel mechanical properties. The experimental results show that the 3D porous hydrogel has great swelling properties (SR = 875.22 g/g) and mechanical properties (elastic modulus = 86.77 MPa). Moreover, compared with the hydrogel without N, S-CDs, the 3D porous hydrogel has an excellent Hg(II) adsorption capacity (943.77 mg/g). In addition, the 3D porous hydrogel has outstanding regeneration performance. The adsorption capacity accounts for 94.6% of the first adsorption capacity after 5 cycles. Therefore, the 3D porous hydrogels are considered as a promising adsorbent for the hazardous Hg(II) absorption.
      PubDate: 2024-01-28
       
  • Valorising Cassava Peel Waste Into Plasticized Polyhydroxyalkanoates
           Blended with Polycaprolactone with Controllable Thermal and Mechanical
           Properties

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      Abstract: Approximately 99% of plastics produced worldwide were produced by the petrochemical industry in 2019 and it is predicted that plastic consumption may double between 2023 and 2050. The use of biodegradable bioplastics represents an alternative solution to petroleum-based plastics. However, the production cost of biopolymers hinders their real-world use. The use of waste biomass as a primary carbon source for biopolymers may enable a cost-effective production of bioplastics whilst providing a solution to waste management towards a carbon–neutral and circular plastics economy. Here, we report for the first time the production of poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) with a controlled molar ratio of 2:1 3-hydroxybutyrate:3-hydroxvalerate (3HB:3HV) through an integrated pre-treatment and fermentation process followed by alkaline digestion of cassava peel waste, a renewable low-cost substrate, through Cupriavidus necator biotransformation. PHBV was subsequently melt blended with a biodegradable polymer, polycaprolactone (PCL), whereby the 30:70 (mol%) PHBV:PCL blend exhibited an excellent balance of mechanical properties and higher degradation temperatures than PHBV alone, thus providing enhanced stability and controllable properties. This work represents a potential environmental solution to waste management that can benefit cassava processing industries (or other crop processing industries) whilst developing new bioplastic materials that can be applied, for example, to packaging and biomedical engineering. Graphical
      PubDate: 2024-01-27
       
  • Polyhydroxyalkanoate Biosynthesis from Waste Cooking Oils by Cupriavidus
           necator Strains Harbouring phaCBP-M-CPF4

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      Abstract: Abstract Waste cooking oil (WCO) from various sources were evaluated as low-cost carbon feedstock to produce poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoate] [P(3HB-co-3HHx)] copolymer, which is a type of polyhydroxyalkanoate (PHA). Different Cupriavidus necator transformants harbouring phaCBP−M−CPF4 were employed as PHA-producing organisms in one-stage cultivation in shake flasks. Biological and chemical recovery of PHA were evaluated. C. necator Re2058/pHT1-CBP−M−CPF4 was able to achieve a cell dry weight (CDW) of 8.5 g/L, PHA content of 75.5 wt% and PHA concentration of 6.4 g/L from 1% (v/v) WCO. The weight-average molecular weight (Mw) of the synthesized PHA obtained from the same strain was 1440 kDa. The CDW, PHA content and concentration acquired using WCO are comparable to those using fresh oils as carbon substrates. The copolymer produced from distinct sources of WCO and different extraction methods did not have significant differences in molecular weights and thermal properties. Mealworms can perform biological recovery of PHA from cells fed with WCO from distinct sources. This study suggests that WCO from any source can be used as carbon source for bacteria to produce PHA. WCO can be a sustainable alternative for the more expensive fresh oils, and the synthesized PHA can be biologically recovered by mealworms. A combination approach of utilising low-cost substrate such as WCO, high-performance PHA producer including C. necator transformants and biological recovery to extract PHA is beneficial in biosynthesis of PHA copolymer, since this can make PHA production more economical and can improve the ability of PHA to compete with conventional petrochemical plastics.
      PubDate: 2024-01-24
       
  • Application of Poly(Glycerol Itaconic Acid) (PGIt) and
           Poly(ɛ-caprolactone) Diol (PCL-diol) as Macro Crosslinkers Containing
           Cloisite Na+ to Application in Tissue Engineering

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      Abstract: Abstract Biomaterials are a crucial issue in the field of tissue engineering. Two types of polymeric biomaterials, such as Poly(glycerol Itaconic acid) (PGIt) and Poly(ɛ-caprolactone) diol (PCL-diol), were synthesized by polycondensation and ring opening polymerization (ROP) respectively. The PCL-diol was selected as a minor phase with 30 and 50 wt%, and Closite-Na + was selected as the nanophase with a constant amount of 5 wt%. Molecular structures PGIt and PCL-diol were analyzed by FTIR, 1H-NMR, and GPC techniques. Microstructures showing the presence of PCL-diol in the PGIt have not created compatible morphologies, albeit the presence of clay nanoparticles has helped to achieve the proper morphologies. Low angle XRD showed exfoliated, and intercalated morphologies can be predicted to pure PGIt and PGIt70PCLdiol30Clay5 samples. Mechanical analysis showed that Young’s modulus and elongation at the break of PGIt50PCLdiol50Clay5 and PGIt100 samples were higher than other samples. DMTA analysis showed that adding PCL-diol into the PGIt increased glass transition temperature (Tg) and storage modulus at 37 °C. The master curve of the studied samples was prepared by the WLF equation at body temperature. Hydrocatalytical degradation, contact angles, and MTT analysis showed that all samples behave well in biological conditions. Cell adhesion, Dapi, and Alizarin red analysis were carried out on the selected samples, and their results showed that the presence of PCL-diol and Clay into the PGIt has improved the biological behavior of the sample and PGIt50PCLdiol50Clay5 shows just behavior.
      PubDate: 2024-01-23
       
 
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  Subjects -> CHEMISTRY (Total: 928 journals)
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INORGANIC CHEMISTRY (45 journals)

Showing 1 - 36 of 36 Journals sorted alphabetically
Acta Polymerica     Hybrid Journal   (Followers: 9)
Additives for Polymers     Full-text available via subscription   (Followers: 20)
Advances in Inorganic Chemistry     Full-text available via subscription   (Followers: 10)
Advances in Polymer Technology     Open Access   (Followers: 13)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 5)
Bioinorganic Chemistry and Applications     Open Access   (Followers: 5)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 1)
Communication in Inorganic Synthesis     Open Access  
European Journal of Inorganic Chemistry     Hybrid Journal   (Followers: 11)
European Polymer Journal     Hybrid Journal   (Followers: 43)
High Performance Polymers     Hybrid Journal   (Followers: 1)
Indian Journal of Chemistry - Section A     Open Access   (Followers: 9)
Inorganic and Nano-Metal Chemistry     Hybrid Journal  
Inorganic Chemistry     Hybrid Journal   (Followers: 33)
Inorganic Chemistry Communications     Hybrid Journal   (Followers: 14)
Inorganic Chemistry Frontiers     Hybrid Journal   (Followers: 4)
Inorganic Materials     Hybrid Journal   (Followers: 6)
Inorganic Materials: Applied Research     Hybrid Journal   (Followers: 1)
Inorganica Chimica Acta     Hybrid Journal   (Followers: 6)
Inorganics     Open Access   (Followers: 1)
International Journal of Bio-Inorganic Hybrid Nanomaterials     Open Access   (Followers: 5)
International Journal of Inorganic Chemistry     Open Access   (Followers: 3)
JBIC Journal of Biological Inorganic Chemistry     Hybrid Journal   (Followers: 2)
Journal of Inorganic and Organometallic Polymers and Materials     Hybrid Journal   (Followers: 8)
Journal of Inorganic Biochemistry     Hybrid Journal   (Followers: 3)
Journal of Inorganic Chemistry     Open Access   (Followers: 4)
Journal of Polymers and the Environment     Hybrid Journal   (Followers: 1)
Journal of Progressive Research in Chemistry     Open Access   (Followers: 2)
Journal of Separation Science     Hybrid Journal   (Followers: 5)
Materials Today Chemistry     Hybrid Journal   (Followers: 2)
Open Journal of Inorganic Chemistry     Open Access   (Followers: 1)
Polymer Bulletin     Hybrid Journal   (Followers: 8)
Polymer Composites     Hybrid Journal   (Followers: 17)
Russian Journal of Inorganic Chemistry     Hybrid Journal  
Separation Science plus (SSC plus)     Hybrid Journal   (Followers: 1)
Zeitschrift für anorganische und allgemeine Chemie     Hybrid Journal   (Followers: 1)
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