Subjects -> MANUFACTURING AND TECHNOLOGY (Total: 363 journals)
    - CERAMICS, GLASS AND POTTERY (31 journals)
    - MACHINERY (34 journals)
    - MANUFACTURING AND TECHNOLOGY (223 journals)
    - METROLOGY AND STANDARDIZATION (6 journals)
    - PACKAGING (19 journals)
    - PAINTS AND PROTECTIVE COATINGS (4 journals)
    - PLASTICS (42 journals)
    - RUBBER (4 journals)

PLASTICS (42 journals)

Showing 1 - 39 of 39 Journals sorted by number of followers
Journal of Applied Polymer Science     Hybrid Journal   (Followers: 135)
Polymer     Hybrid Journal   (Followers: 89)
European Polymer Journal     Hybrid Journal   (Followers: 42)
Plastic and Polymer Technology     Open Access   (Followers: 40)
Plastic and Reconstructive Surgery     Hybrid Journal   (Followers: 31)
Additives for Polymers     Full-text available via subscription   (Followers: 20)
Reinforced Plastics     Full-text available via subscription   (Followers: 17)
Polymer Engineering & Science     Hybrid Journal   (Followers: 14)
Advances in Polymer Technology     Open Access   (Followers: 13)
ACS Applied Polymer Materials     Hybrid Journal   (Followers: 11)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 9)
Acta Polymerica     Hybrid Journal   (Followers: 9)
Journal of Inorganic and Organometallic Polymers and Materials     Hybrid Journal   (Followers: 8)
Polymer Bulletin     Hybrid Journal   (Followers: 6)
Journal of Polymer Research     Hybrid Journal   (Followers: 6)
International Journal of Polymeric Materials     Hybrid Journal   (Followers: 6)
Journal of Polymer Science Part C : Polymer Letters     Hybrid Journal   (Followers: 5)
Polymer-Plastics Technology and Materials     Hybrid Journal   (Followers: 5)
Advanced Industrial and Engineering Polymer Research     Open Access   (Followers: 5)
Polymer Science Series B     Hybrid Journal   (Followers: 4)
Polymer Science, Series A     Hybrid Journal   (Followers: 3)
Polymer Science Series C     Hybrid Journal   (Followers: 3)
Polymer Science Series D     Hybrid Journal   (Followers: 3)
Iranian Journal of Polymer Science and Technology     Open Access   (Followers: 1)
Progress in Rubber, Plastics and Recycling Technology     Hybrid Journal   (Followers: 1)
Microplastics and Nanoplastics     Open Access   (Followers: 1)
High Performance Polymers     Hybrid Journal   (Followers: 1)
Journal of Polymers and the Environment     Hybrid Journal   (Followers: 1)
International Polymer Processing     Full-text available via subscription   (Followers: 1)
Journal of Cellular Plastics     Hybrid Journal   (Followers: 1)
Journal of Plastic Film and Sheeting     Hybrid Journal   (Followers: 1)
Plastics Engineering     Partially Free   (Followers: 1)
Polymers from Renewable Resources     Hybrid Journal  
International Journal of Biobased Plastics     Open Access  
Polymers and Polymer Composites     Hybrid Journal  
SPE Polymers     Open Access  
Majalah Kulit, Karet, dan Plastik     Open Access  
Cirugia Plastica Ibero-Latinoamericana     Open Access  
Journal of Elastomers and Plastics     Hybrid Journal  
Similar Journals
Journal Cover
Journal of Polymer Research
Journal Prestige (SJR): 0.403
Citation Impact (citeScore): 1
Number of Followers: 6  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1572-8935 - ISSN (Online) 1022-9760
Published by Springer-Verlag Homepage  [2467 journals]
  • The preparation of the polyamide 6/fluorescein composite by in situ
           polymerization method and its properties

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      Abstract: Abstract Fluorescein with carboxyl groups (-COOH) reinforced polyamide 6 (PA6) composite was prepared readily by in situ polymerization method, where carboxyl groups of fluorescein could react with the amino groups of PA6 prepolymer, thereby forming chemically bonded PA6/fluorescein composite (denoted as PA6-F). As-fabricated PA6-F was evaluated by means of X-ray diffraction (XRD), differential scanning calorimetry (DSC), Fluorescence spectrometry, etc. The results indicated that PA6-F showed fluorescence behaviors under 254 nm ultraviolet light illumination. Moreover, the addition content (mass fraction) of fluorescence had significant effect on the crystalline form of PA6, and γ crystalline was predominant while fluorescein was introduced to PA6 matrix, as well as crystallization and melting performances. Furthermore, the friction and wear resistance properties, mechanical strength of PA6-F were also tested. Findings showed that fluorescein as filler favored to generate PA6-F with improved mechanical properties and tribological properties.
      PubDate: 2022-11-30
       
  • Novel di and tripeptide side groups bearing acrylate polymers: synthesis,
           characterization, and their theoretical, and electrical properties

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      Abstract: Abstract In this study, the kinetic and dielectric properties of new acrylate polymers containing dipeptide and tripeptide side groups were studied. For this purpose, homopolymers containing peptide side groups were obtained through the new acrylate monomers (Tyr(Boc)-Met-OCH3 and Tyr(Boc)-Met-Phe-OCH3) via the free radical polymerization method. The glass transition temperatures (Tg) of polymers were determined as 221.58 and 206.25. The average activation energies of polymers were measured at different heating rates (5, 10, 20, 30 and 40 °C min−1) and calculated as 136,85 and 118,10 kj mol−1 based on Flynn–Wall–Ozawa (F-W–O) method, respectively. Theoretical experiments were carried out via density functional theory (DFT). The dielectric parameters of the polymers were determined as a function of frequency, so that, dielectric constant values of homopolymers at 1 kHz calculated as 8.64 and 5.12 and ac conductivities were calculated as 5.27 × 10–09 S cm−1 and 3.06 × 10–09 S cm−1.
      PubDate: 2022-11-30
       
  • Effect of blend ratio on thermal, mechanical, and shape memory properties
           of poly (lactic acid)/thermoplastic polyurethane bio-blends

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      Abstract: Abstract The increase in surgical interventions and the need for rapid patient recovery have sped up biomaterials research. Materials for sutures that feature shape memory properties prevent the opening of surgical stitches and accelerate wound healing and patient recovery. Shape memory polymers (SMP) are stimuli-responsive materials that can recover to their original shape, for example, non-strained, after some external stimulus, as the temperature can be used for thermo-responsive SMP. Poly (lactic acid) (PLA)/thermoplastic polyurethane (TPU) bio-blends have shape memory properties and can be an excellent choice of biomaterial for use in this area. In this work, PLA/TPU bio-blends with different blend mass ratios (100/0, 90/10, 80/20, 70/30, 60/40, 50/50, 40/60, 30/70, 20/80, 10/90, and 0/100) were prepared using a twin-screw extruder and the effect of blend ratio on the mechanical (tensile tests and Izod impact strength), thermal, morphological, rheological and shape memory properties of PLA/TPU bio-blends were evaluated. PLA/TPU bio-blends presented a dispersed phase morphology of the lower content component. A decrease in the degree of crystallinity of the PLA phase was observed for the PLA/TPU blends with the increase of the TPU phase. PLA/TPU bio-blends with higher TPU contents showed better shape recovery, highly prized property in SMP, and increased recovery temperature positively and directly affected this property. PLA/TPU (30/70) presented the best results for the use in sutures lines and passed the self-tightening knot test, with an elongation at break of 80% and a shape recovery ratio of 40%.
      PubDate: 2022-11-30
       
  • Enhanced photodetection properties of GO incorporated flexible PVDF
           membranes under solar spectrum

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      Abstract: Abstract Here we report the enhanced photodetection capabilities of graphene oxide (GO) incorporated highly flexible polyvinylidene fluoride (PVDF) membranes when illuminated by solar spectrum. Free-standing and β-crystalline PVDF membranes with varied amount of GO (~ 5%, 10%, 15% and 20%) are fabricated by easy and cost-effective chemical synthesis technique. Significant improvement in dark current as well as solar photocurrent is observed while very small amount of GO are added into the host PVDF matrix at different proportions. For wide band of solar spectrum having input light power of 1 sun (100 mW/cm2), the responsivity for pristine PVDF arises out to be 0.004 µA/cm2/W with response time of ~ 44 s. Due to addition of GO into PVDF the photocurrent and photoresponsivity increased while the response time decreased. Maximum responsivity of 0.026 µA/cm2/W is observed for PVDF/GO (15%) with response time of ~ 21 s. When measured in bending state the flexible polymer composite membranes exhibit better photocurrent compared to their relief condition which is attributed to the piezo-phototronic effect. Complex impedance spectroscopic study at room temperature in dark and light clearly indicates the facilitation of charge transport due to modification of grain boundaries which in turn enhances the photocurrent in PVDF/GO composite membranes making them suitable for flexible photovoltaic and piezo-phototronic devices.
      PubDate: 2022-11-29
       
  • Preparation and process optimization of epoxidized styrene-butadiene latex

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      Abstract: Abstract Epoxidation modification is an effective method to improve compatibility and dispersion of polar fillers in styrene-butadiene rubber (SBR). However, large amount of organic solvents used in common process of epoxidation modification not only increases cost, but also poses threat to environment. In this paper, epoxidized styrene-butadiene rubber (ESBR) with different epoxy degrees were synthesized by direct epoxidation modification of styrene-butadiene latex utilizing in-situ generated peroxyformic acid. Meanwhile, the effects of different experimental conditions on epoxy degree of ESBR were investigated. The spectra of 1H NMR and FT-IR indicated that polar epoxy groups were successfully introduced into molecular chain. Thermal analysis showed that the glass transition temperature Tg increased with the increase of epoxy degree of ESBR, and the thermal stability before and after modification did not change significantly. The optimal process for ESBR was also determined with response surface analysis.
      PubDate: 2022-11-29
       
  • Cobalt -mediated radical polymerization of vinyl acetate in a packed
           column system: simultaneous effective control of molecular weight,
           separation, and purification

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      Abstract: Abstract The simultaneous control of the molecular weight, separation, and purification of polyvinyl acetate was achieved using a cobalt-mediated radical polymerization (CMRP) in a packed column with silica gel particles (PC-CMRP). The controlled radical polymerization of VAc in the packed columns was evaluated from the linear time dependence of Ln[M]0/[M], linear increase of molecular weight with the increase in conversion, and narrow molecular weight distribution. PC-CMRP method was used to produce high-purity polymers with controlled molecular weight and narrow molecular weight distribution without requiring additional purification steps. The high ability of silica gel particles to adsorb free Co(acac)2 from the polymer matrix leads to the formation of pure polymers with decolorization efficiency = 91%. This method introduced a new capability for separation of polymers with known molecular weights and narrower molecular weight distributions, during the polymerization. Packed column in CMRP reactions can physically lead to the generation of long-lived propagating radicals and thus enhance the probability of producing polymers with a higher molecular weight and lower polydispersity index.
      PubDate: 2022-11-29
       
  • Preparation and optical characterization of poly (vinyl alcohol) and
           starch (native and modified) blend films

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      Abstract: Abstract Polymeric films of Poly(vinyl alcohol) (PVA) to produce a lower band gap by blending it with native basmati rice starch (BRS) and Octenyl Succinic Anhydride (OSA) modified basmati rice starch (MBRS) were generated in the current study. The recorded UV–visible spectra in the wavelength range 190–1100 nm specified a redshift in the UV region from 190 to 220 nm, which attributed to the π → π* transitions. The UV–visible absorbance data was utilized to evaluate the optical constants such as band gap, extinction coefficient, refractive index, carbon atoms in conjugation, Urbach’s energy, and optical conductivity. The Eg of PVA significantly decreased from 6.36 to 5.77 eV with BRS and MBRS addition. The shifts and alteration in the OH band intensity in the FTIR spectrum confirmed the hydrogen bonding among the blended films. The XRD analysis specified blending of PVA with BRS or MBRS reduced the crystallinity of the blended films.
      PubDate: 2022-11-29
       
  • Performance and mechanism study of PESA-IA as a green oilfield scale
           inhibitor: experimental and molecular dynamics simulation

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      Abstract: Abstract Modified polyepoxysuccinic acid (PESA-IA) was prepared by grafting itaconic acid (IA) on polyepoxysuccinic acid (PESA), which was applied to inhibit the formation of calcium carbonate (CaCO3) scale in oilfield environment. The increase of the carboxylic acid group enhances the chelating effect on calcium ions, which leads to the inhibition effect. The effects of temperature, scale inhibitor concentration and salt content on scale inhibition performance were investigated. The results show that in the static scale inhibition experiment, PESA-IA has good inhibition effect on CaCO3 scale sample, and the scale inhibition efficiency increases gradually as the temperature decreases and the concentration increases. When the temperature is 50 ℃ and the concentration is 100 mg/L, the scale inhibition efficiency reaches 98.84%. When the temperature is 70 ℃ and the concentration is 60 mg/L, the inhibition effect of scale inhibitor on CaCO3 scale increases with the salt content. The effect showed a trend of first increasing and then slightly decreasing, reaching a maximum value of 84.78% at 16 g/L, and the scale inhibition performance of PESA-IA was significantly better than that of PESA improved by 13.6%. The morphology, structure and composition of the scale samples were characterized and analyzed by scanning electron microscopy and EDS energy spectroscopy. Molecular dynamics (MD) method was used to simulate the interaction between PESA-IA and CaCO3 crystalline surface at different temperatures. The results show that the binding energy decreases as the temperature of the system increases, and the reaction between polymer molecules and CaCO3 crystals in the system can be seen by increasing the time step and the concentration of water molecules in X, Y, Z direction, and the calculated results are consistent with the experimental phenomena.
      PubDate: 2022-11-28
       
  • Amine-functionalized fibrous sepiolite and graphene oxide in situ
           self-assembled hybrid network for reinforcement of natural rubber
           composite

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      Abstract: Abstract Efficient fabrication of graphene oxide (GO) network in rubber composites is critical for enhancing its mechanical properties. Herein, the surface of fibrous sepiolite is modified with amino-silane to form amine-functionalized fibrous sepiolite (afSep), then the segregated networks of GO and afSep hybrid sheets in natural rubber (NR) latex can be self-assembled by the electrostatic attraction between the protonated amine groups of afSep and the carboxyl groups/epoxy groups of GO, thereby casting and drying at room temperature to form GO-afSep/NR composite. When the hybrid network is assembled with 0.2 phr (per hundred parts of rubber) GO and 0.4 phr afSep in un-crosslinked NR composite, the tensile strength and elongation at break improve by 33.9% and 4.8% compared with un-crosslinked GO/NR composite, respectively, which is attributed to the segregated network of the afSep fibers attached to the basal plane of GO sheets in NR composite.
      PubDate: 2022-11-28
       
  • Synthesis of controlled release hydrogels from dimethylacrylamide/maleic
           acid/starch and its application in lettuce cultivation

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      Abstract: Abstract Over or under the application of fertilizers raises concerns about soil and environmental degradation, and the recently developed controlled application of fertilizers is the focus of addressing these concerns. In this study, we aimed to synthesize a new N,N-Dimethylacrylamide (DMAAm)—Maleic Acid (MA) – Starch (St)-based superabsorbent (p(DMAAm-co-MA-co-St) (DMSt1)) and to evaluate the suitability of controlled release fertilizers in lettuce cultivation. HCl/NaOH were used to create negative and positive surface modifications of DMSt1 and respectively, were named to be p(DMAAm-co-MA-co-Starch)/HCl (DMSt2) and p(DMAAm-co-MA-co-Starch)/NaOH (DMSt3). The finished product had a high-water absorbency and improved the soil's water retention capacity. Moreover, after the urea sorption and release studies of the synthesized superabsorbent were carried out in vitro, their effects on the development of the lettuce plant were also examined. During the application, the length, root diameter, number of leaves, chlorophyll amount and color characteristics of the lettuce were measured. It was also observed and photographed how the morphological and structural properties of lettuce were affected by applying drought stress. At the end of the drought stress, the color of the lettuce growing in pots with hydrogel was found to be greener and the chlorophyll content was higher compared to the control group. In addition, according to the results of the membrane damage index obtained from lettuce leaves, it was determined that water deficiency did not occur in the lettuce thanks to the hydrogels, and thus, no deterioration in the structure of the membranes occurred. In summary, it can be said that the newly synthesized superabsorbent has an alternative application potential in agricultural production.
      PubDate: 2022-11-28
       
  • Synthesis of fluorine-contained hyperbranched polysiloxane with blue
           photoluminescence and research on its fluorescence properties

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      Abstract: Abstract In order to obtain a new type of aggregation-induced emission (AIE) polymer without traditional chromophore groups and large π-electron conjugates, the fluorine-containing hyperbranched polysiloxane (F-HBPSi) were prepared. The 3,3,3-trifluoropropyl trimethoxysilane and excess neopentyl glycol (NPG) were used as raw materials, and the F-HBPSi with a large number of F–C bonds and hydroxyl groups was successfully synthesized by one-step polycondensation reaction. The fluorescence properties of the F-HBPSi were also studied. Excitingly, the prepared F-HBPSi is able to emit bright blue photoluminescence and exhibit significant ultraviolet absorption when illuminated by an ultraviolet lamp at 365 nm wavelength. It can also be observed that the excitation and emission intensity of the F-HBPSi gradually increased with the increase of their molecular weight, and decreased with the increase of temperature. These indicating that the fluorescence properties of F-HBPSi was related to molecular weight and the temperature. The results also showed that both F–C bonds and hydroxyl groups are important in the formation of blue-emitting species. This work therefore opens up new avenues for designing new luminescent materials.
      PubDate: 2022-11-28
       
  • A novel polyamidoamine dendrimer based nano-carrier for oral delivery of
           imatinib

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      Abstract: Abstract Designing and developing efficient and non-toxic drug delivery systems is an exciting subject in pharmacology and cancer therapy. In this study, we have developed a nano-carrier based on the third generation of polyamidoamine (PAMAM-G3) dendrimer, grafted with polyethylene glycol (PEG 4000) and folic acid (FA) for oral delivery of Imatinib (IM) with sustained release. The synthesized drug carrier and the manufactured nano-complexes (two different amounts of IM encapsulated by the drug carrier) were characterized using FTIR and 1HNMR spectroscopy, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), dynamic light scattering (DLS), and zeta potential analysis. The SEM images showed a typical smooth brittle structure for nano-complexes and, DSC thermograms confirmed the purity and integrity of both formulations. The average size of nano-complexes using DLS analysis was estimated to be around 100 nm with a zeta potential of + 0.2 mV. The drug loading efficiency and the drug release of nano-complexes were also studied in-vitro at pH 7.4 using UV–Vis spectroscopy. The manufactured nano carrier showed efficient entrapment of IM drug, and a sustained release was observed for nano-complexes in physiological conditions. Both formulations were effective against the human colorectal cancer cell line (SW480) and the human lung cancer cell line (A549) in the in-vitro cellular growth inhibition method. The best result was acquired against the cell line SW480 with the IC50 value of 38.88 ± 0.13 (μg.mL−1).
      PubDate: 2022-11-25
       
  • Physical, mechanical and abrasive wear behavior of attapulgite reinforced
           walnut shell/PVC composites

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      Abstract: Abstract The effects of attapulgite (ATP) addition (0, 1, 3, 5 and 7 wt %) on the microstructure, chemical composition, thermal stability, physical properties, mechanical properties, water absorption and abrasive wear resistance of walnut shell (WS) filled polyvinyl chloride (PVC) composites were studied. ATP was blended with WS powder, and the WS/ATP/PVC composites were prepared by melt blending extrusion using a single screw extruder. The performance test results of the composites showed that, properties of the composites were improved after the addition of ATP when compared to the composites without ATP, although the chemical structure of the composites did not change significantly. The composites with 3% ATP have the best thermal stability and wear resistance, as well as the lowest water absorption. The tensile strength, bending strength, hardness and density increased by 31%, 16%, 10% and 1% respectively. However, the composite has the highest impact strength after adding 1% ATP, which was 11% higher than without ATP. The results indicate that ATP has the potential to improve the characteristics of biomass composites in a simpler and more environmentally friendly method.
      PubDate: 2022-11-24
       
  • Synthesis and properties of bio-based thermoplastic poly(ether urethane)
           for soft actuators

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      Abstract: Abstract In this study, bio-based thermoplastic polyurethane (TPU) for use in soft actuators is bio-based poly(ether-urethane) made using fermented corn, along with bio-derived compounds such as propane-1,3-diol (PDO) as a chain extender. Bio-based TPUs were obtained through a solvent-free one-shot synthesis method, and the effects of varying the [NCO]/[OH] molar ratio and type of isocyanates on chemical structure, thermal stability, and mechanical properties were investigated. The degree of phase separation (DPS) and state of hard segment (HS) / soft segment (SS) of TPU are important factors affecting the thermal and physical properties of the prepared film. These properties depend on the [NCO]/[OH] molar ratio and the type of isocyanates used for polymerization. The results showed that, when aromatic isocyanate was used, the degree of separation of the HS/SS was improved as the molar ratio increased. The average molecular weight and DPS as well as thermal and mechanical properties of 1-isocyanato-4-[(4-isocyanatophenyl)methyl]benzene (MDI)-based TPU samples are all higher than those of 1,1’-methylenebis(4-isocyanatocyclohexane) (H12MDI)-based TPU samples in spite of the lower HS content. These findings of this study are expected to contribute to the preparation of fused deposition modeling (FDM) 3D printing or 4D printing for shape memory polymer from bio-based TPU filaments for use in soft actuators with a shore hardness range of 59~84A.
      PubDate: 2022-11-24
       
  • PAAm/CMC/nanoclay nanocomposite hydrogel: understanding the influence of
           initiators on the chain-growth mechanisms

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      Abstract: Abstract In this study, heat measurements were used to investigate the influence of three initiators on the chain-growth mechanisms of polyacrylamide/carboxymethylcellulose/nanoclay nanocomposite hydrogels. All the matrices had highly interconnected porous surfaces with intercalated configurations. Swelling degree measurements were conducted to investigate the effect of the various formed chains on the physicochemical properties of these matrices. According to the findings, hydrogels synthesized using a potassium persulfate initiator had the highest water absorbency (around 40.8 ± 0.8 g.g^−1), followed by those synthesized using sodium persulfate (38.1 ± 1.0 g.g^−1) and ammonium persulfate initiators (34.8 ± 0.7 g.g^−1). The nanoclay-containing nanocomposite had a similar water absorption tendency. Additionally, all the nanocomposites had a lower swelling degree than pure hydrogel because nanoclay acted as a physical crosslinker in the polymeric matrix, decreasing the chain elasticity and water sorption ability. Different physicochemical properties were then generated due to the difference in polymerization mechanisms. Chain combination was the preferred termination mechanism for the polymerization of the hydrogel with the highest water absorbency. It was also plausible to assume that chain transfer reactions favored the termination mechanisms of the polymerization of the nanocomposites synthesized using NaPS and APS initiators, generating polymeric chains with low molecular weight and reducing the water absorption capacity. The insertion of nanoclay inhibited the start of the polymerization initiation step by preventing the initiator from attacking the monomer. Thus, a better understanding of the interaction between the initiators and hydrogel components can aid in the synthesis of hybrid nanocomposites with desirable characteristics and properties.
      PubDate: 2022-11-23
       
  • Preparation of TiO2/Ag/GO/Nylon 6,6 nanofiber membrane by a novel
           electrospinning method and its photodegradation efficiency under visible
           light

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      Abstract: Abstract With the development of industry in recent years, the problem associated with water pollution has been aggravated, and so this causes serious damage to our environment. One of the most effective ways to improve water pollution is the use of the "titanium dioxide (TiO2) photocatalytic method". For this reason, we prepared TiO2 photocatalyst with silver (Ag) and graphene oxide (GO) by means of sol–gel method to obtain TiO2/Ag, TiO2/GO and TiO2/Ag/GO three photocatalysts. We then employed the visible light as light source, the methylene blue as pollutants, the UV–Visible absorption spectrometer measurement, and so compared the removal fraction of the three photocatalysts. Among them, the TiO2/Ag/GO photocatalyst has the highest dye removal fraction (51.41 ± 5.58%). The comparison of the TiO2/Ag/GO photocatalyst with the best efficiency was made with commercially available P25 photocatalyst to block the UV light. By referring to the experiments on the UV light block, the removal fraction of TiO2/Ag/GO photocatalyst (48.71 ± 2.02%) was higher than commercially available P25 photocatalyst (25.66 ± 3.66%). In this study, in order to efficiently recover the used photocatalyst, a photocatalyst blended solution was prepared with different weight percentages of TiO2/Ag/GO photocatalyst and nylon (Nylon 6,6)/formic acid solution (8wt%). To that end, the technology of electrospinning was used to produce a nanofiber membrane (TiO2/Ag/GO/Nylon 6,6 NFM). Based on the experimental results, the 3.0wt% TiO2/Ag/GO/Nylon 6,6 nanofiber membrane has the best visible light removal fraction of methylene blue (90.52 ± 0.58%).
      PubDate: 2022-11-23
       
  • Adsorption behaviours of copper(II), lead(II), and cadmium(II) ions from
           aqueous solution by polyethylenimine -modified magnetic hydrogel
           nanocomposites

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      Abstract: Abstract A series of novel polyethylenimine (PEI)-modified magnetic hydrogel nanocomposites (PEI-mHNs) for heavy metal ions removal were prepared by copolymerization of acrylamide, acrylic acid and PEI-modified magnetic nanoparticles using polyethylene glycol diacrylate as chemical crosslinker and PEI-modified magnetic nanoparticles as physical crosslinker. FTIR and XRD results preliminarily confirmed the target structure of PEI-mHNs without destroying the structure of magnetic nanoparticles during modification and radical copolymerization. PEI-mHNs have rough and uneven surface with many porous and gap structure, which makes the rapid adsorption rate and high adsorption capacity of heavy metal ions(Cu(II) (150 mg/g), Cd(II) (236.7 mg/g) and Pb(II) (371.4 mg/g). The adsorption capacity of PEI-mHNs could be improved by increasing the pH of the original solution and initial concentration of heavy metal ions. Heavy metal ions adsorption isotherms and kinetics conformed to the Langmuir model and pseudo-second-order kinetic model, respectively. Besides, PEI-mHNs had good magnetic responsiveness, desorption and reusability which made them potential materials to remove heavy metal ions from the aqueous solution.
      PubDate: 2022-11-23
       
  • Fabrication of high-performance lignin/PHBH biocomposites with excellent
           thermal, barrier and UV-shielding properties

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      Abstract: Abstract Sustainable EHL/PHBH biocomposites were prepared by the addition of enzymatic hydrolyzed lignin (EHL) into poly (3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH) via solution casting technique. The research comprehensively evaluated the effects of EHL contents on the morphological, thermostability, barrier and anti-ultraviolet properties of EHL/PHBH biocomposites. SEM and FT-IR analysis showed that the EHL filler had good dispersibility in PHBH matrix and the good interface binding was observed in biocomposites. Compared with neat PHBH, the tensile strength and Young's modulus of biocomposites with 3 ~ 5 wt% EHL increased by 46.1% and 130.4%, respectively, and the maximum degradation temperature (Tmax) increased by 50 °C. More notably, a 30.2% and 52.3% reduction of the moisture and oxygen permeability, which were much higher than conventional plastics. It was also found that the biocomposites exhibited excellent UV resistance, almost completely shielding UV-A (320–400 nm) and UV-B (280–320 nm), and good antioxidant activity with 76.6% DPPH scavenging rate. The above, EHL/PHBH were demonstrated a promising biocomposites for anti-oxidation, UV-blocking, oxygen barrier and moisture-proof packaging materials.
      PubDate: 2022-11-22
       
  • Effect of POSS-NH2-grafted different plasticizers on the crystallization
           properties of SC-Poly (l-lactic acid)

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      Abstract: Abstract Poly (l-lactic acid) (PLLA) and polycarbonate (PCL) grafted Monoamino-Polyhedral oligomeric silsesquioxane (POSS-NH2) (POSS-PLLA and POSS-PCL) by ring-opening polymerization of L-lactide (L-LA) and caprolactone (ε-CL) from POSS-NH2 were obtained in this work. The fourier transform infrared spectrometer (FTIR) results show that the stretching vibration peaks of -C(O)-NH- of POSS-PLLA and POSS-PCL appears at 1650 cm−1 and 1645 cm−1. The crystal diffraction peaks of POSS-PLLA at 22°, 16.7° and 19° are same as the peak positions of PLLA; POSS-PCL at 21.7° 23.7° are same as the peak positions of PCL by X-Ray diffraction (XRD). Both FTIR and XRD results indicate that the grafted products are synthesized successfully. Then, the different contents of POSS-PLLA, POSS-PCL and purchased POSS-polyethylene glycol (POSS-PEG) were blended with PLLA/Poly (d-lactic acid) (PDLA) (with the mass ratio of 1:1) to prepare ternary blends with different contents of polymer grafted POSS. The effects of POSS-PLLA, POSS-PCL and POSS-PEG on the crystallization behavior of PLLA/PDLA were investigated. The results show that compared with POSS-PCL and POSS-PLLA, POSS-PEG enhances the crystallization ability of PLLA/PDLA, and promotes the formation of stereocomplex (SC); on the contrary, POSS-PCL and POSS-PLLA inhibit the formation of SC.
      PubDate: 2022-11-21
       
  • Improved mechanical and tribological properties of PAAm/PVA
           hydrogel-Ti6Al4V alloy configuration for cartilage repair

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      Abstract: Abstract Cartilage disease is one of the most common clinical conditions, decreasing the quality of life in a wide range of population. Hydrogels have been widely reported as potential cartilage repair materials, but the inadequate mechanical strength limits their further application. Inspired by the soft-on-hard structure of natural articular cartilage, we fabricated PAAm/PVA hydrogel on Ti6Al4V alloy configuration combining the excellent lubrication of hydrogel layer and good load-bearing capacity of rigid substrate. The mechanical and tribological properties of bulk PAAm/PVA hydrogel and PAAm/PVA hydrogel-Ti6Al4V alloy configuration as the function of PAAm:PVA mass ratio (wt/wt) were investigated. Meanwhile the bonding state of the PAAm/PVA hydrogel-Ti6Al4V alloy configuration was also detected. The mechanical properties are improved by incorporating PAAm in PVA hydrogel, but a higher mass ratio of PAAm:PVA results in the degradation of the mechanical properties. PAAm/PVA hydrogel with PAAm:PVA ratio of 1:1 shows a higher interfacial toughness, while PAAm/PVA hydrogel with PAAm:PVA ratio of 1:3 presents a lower friction coefficient of ~ 0.050. Collectively, the load carrying ability of the PAAm/PVA hydrogel is notably improved by the support of the titanium alloy substrate in the PAAm/PVA hydrogel-Ti6Al4V alloy configuration.
      PubDate: 2022-11-19
       
 
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