Subjects -> MANUFACTURING AND TECHNOLOGY (Total: 362 journals)
    - CERAMICS, GLASS AND POTTERY (31 journals)
    - MACHINERY (34 journals)
    - MANUFACTURING AND TECHNOLOGY (223 journals)
    - METROLOGY AND STANDARDIZATION (5 journals)
    - PACKAGING (19 journals)
    - PAINTS AND PROTECTIVE COATINGS (4 journals)
    - PLASTICS (42 journals)
    - RUBBER (4 journals)

PLASTICS (42 journals)

Showing 1 - 32 of 32 Journals sorted alphabetically
ACS Applied Polymer Materials     Hybrid Journal   (Followers: 9)
Acta Polymerica     Hybrid Journal   (Followers: 9)
Additives for Polymers     Full-text available via subscription   (Followers: 20)
Advanced Industrial and Engineering Polymer Research     Open Access   (Followers: 4)
Advances in Polymer Technology     Open Access   (Followers: 13)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 9)
Cirugia Plastica Ibero-Latinoamericana     Open Access  
European Polymer Journal     Hybrid Journal   (Followers: 44)
International Journal of Biobased Plastics     Open Access   (Followers: 2)
International Journal of Polymeric Materials     Hybrid Journal   (Followers: 6)
International Polymer Processing     Full-text available via subscription   (Followers: 1)
Iranian Journal of Polymer Science and Technology     Open Access   (Followers: 1)
Journal of Applied Polymer Science     Hybrid Journal   (Followers: 115)
Journal of Inorganic and Organometallic Polymers and Materials     Hybrid Journal   (Followers: 8)
Journal of Polymer Research     Hybrid Journal   (Followers: 7)
Journal of Polymer Science Part C : Polymer Letters     Hybrid Journal   (Followers: 5)
Journal of Polymers and the Environment     Hybrid Journal   (Followers: 1)
Majalah Kulit, Karet, dan Plastik     Open Access  
Microplastics and Nanoplastics     Open Access  
Plastic and Polymer Technology     Open Access   (Followers: 40)
Plastic and Reconstructive Surgery     Hybrid Journal   (Followers: 30)
Plastics Engineering     Partially Free  
Polymer     Hybrid Journal   (Followers: 86)
Polymer Bulletin     Hybrid Journal   (Followers: 7)
Polymer Engineering & Science     Hybrid Journal   (Followers: 15)
Polymer Science Series B     Hybrid Journal   (Followers: 4)
Polymer Science Series C     Hybrid Journal   (Followers: 3)
Polymer Science Series D     Hybrid Journal   (Followers: 3)
Polymer Science, Series A     Hybrid Journal   (Followers: 3)
Polymer-Plastics Technology and Materials     Hybrid Journal   (Followers: 5)
Reinforced Plastics     Full-text available via subscription   (Followers: 17)
SPE Polymers     Open Access  
Similar Journals
Journal Cover
Journal of Polymer Research
Journal Prestige (SJR): 0.403
Citation Impact (citeScore): 1
Number of Followers: 7  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1572-8935 - ISSN (Online) 1022-9760
Published by Springer-Verlag Homepage  [2469 journals]
  • 3D printed bio polymeric materials as a new perspective for wound dressing
           and skin tissue engineering applications: a review

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      Abstract: The skin is responsible for several necessary physiological activities and plays a prominent role in wound healing. Advanced wound healing requires the use of skin tissue engineering. It was developed primarily to address the difficulties associated with using traditional wound dressings when scars become inflamed or infected. In this way, 3D printing is a unique technology that has attracted an excellent deal of attention within the health profession. This technology improves the ability to combine various medications and proteins with the engineered microstructures of printed products. The advent of 3D printing offers exciting new possibilities for traditional wound dressings to heal broken skin with this new technique. Reconstruction of the skin can be attempted with a specially designed hydrogel with loaded drugs for advanced wound healing. Therefore, this technology can cause a dramatic reduction in the risk of infection and inflammation in wounds. This study comprehensively reviews the latest achievements in polymer 3D printing for wound dressings and skin tissue engineering. Commercially available 3D printing technologies are also explained and these technologies were compared for the wound dressing fabrication.
      PubDate: 2022-01-20
       
  • Modifying the properties of poly(1,4-cyclohexylenedimethylene
           terephthalate) by hydroquinone bis(2-hydroxyethyl) ether

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      Abstract: A new copolyesters of poly(2-[4-(2-hydroxyethoxy)phenoxy]ethyl-co-1,4-cyclohexylenedimethylene terephthalate) (PHCT) with different compositions were synthesized from terephthalic acid, 1,4-cyclohexanedimethanol and hydroquinone bis(2-hydroxyethyl) ether (HQEE) via esterification-polycondensation reaction. The synthesized copolyesters were analyzed by 1H-NMR, FT-IR, GPC, intrinsic viscosity, DSC, TGA and tensile testing, respectively. The 1H-NMR and FT-IR analysis confirm the successful introduction of HQEE into poly(1,4-cyclohexylenedimethylene terephthalate (PCT) chains. The introduction of HQEE into PCT chains can effectively lower the melting point of PCT, making it easier to process. The glass transition temperature of PHCT is higher than 70 ℃ and it has the comparable thermal stabilities to PCT. In addition, introducing HQEE into PCT chains can effectively improve the molecular weights of PCT, thus imparting PHCT with better mechanical performance relative to PCT. The PHCT is a tough polymer, which owns the higher Young’s modulus (above 300 MPa), the higher tensile strength (above 39 MPa) and the higher elongation at break (above 226%).
      PubDate: 2022-01-20
       
  • The antibacterial activity and mechanism of polyurethane coating with
           quaternary ammonium salt

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      Abstract: An antibacterial PU coating with QAS was developed from polycarbonate diol (PCDL), 4,4'-Diphenylmethane diisocyanate (MDI), 3-dimethylamino-1,2-propanediol (DMAPD) and 1-bromododecane. The structural composition and surface morphology of this PU coating were characterized by X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM). Besides, the QAS-bearing PU showed markedly antimicrobial activity against both gram-positive Staphylococcus aureus (S. aureus) and gram-negative Escherichia coli (E. coli). The samples were marked as PU-2, PU-3, PU-4, PU-5, PU-6 and PU-7 according to the different theoretical molar fraction of DMAPD in chain extenders, which were 20, 30, 40, 50, 60 and 70%, respectively. Apparently, PU-4 coating showed the best antibacterial activity against S. aureus, whereas PU-5 against E. coli.
      PubDate: 2022-01-20
       
  • Synthesis and characterization of Aloe-vera-poly(acrylic
           acid)-Cu-Ni-bionanocomposite: its evaluation as removal of carcinogenic
           dye malachite green

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      Abstract: A semi interpenetrating polymer network (SIPN) of Aloe-vera-poly(acrylic acid) and its nano-composite were synthesized by free radical polymerisation method. Effect of various chemical properties on percentage swelling of nano-composites was investigated. Nanoparticles in SIPN was characterised by FTIR, Field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), thermal gravimetric analysis (TGA) and electron dispersive spectroscopy (EDS). Synthesized nanocomposite was evaluated as an adsorbent for the adsorption of carcinogenic dye malachite green. Optimised condition for removal of malachite green dye from synthesized nanocomposite was pH 10, time 16 h, dye concentration 10 ppm and adsorbent dosage 0.05g. Maximum dye removal exhibited by the synthesized nano composite was 98.2%. Dye adsorption isotherm and kinetics were best explained through Freundlich adsorption isotherm and pseudo second order model, exhibiting its correlation coefficient (R2)0.99569 and 0.99271. Thus, synthesized nano-composite was utilised as an efficient device for dye sorption.
      PubDate: 2022-01-20
       
  • An ultraviolet light-responsive polyacrylate film with high fatigue
           resistance

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      Abstract: Photochromic materials with stable properties during long-term use have a very broad application prospect. Herein, five kinds of spirooxazines (SO1-SO5) with antioxidant properties were successfully synthesized by blending and covalently bonding antioxidants. Then various photochromic polyacrylate laminating adhesives (PA1-PA7) with good fatigue resistance were prepared by incorporating spirooxazines into polyacrylate. Among them, this study used 2, 6 -di-tert-butyl-4-methylphenol (BHT) as the main antioxidant, and tris (2, 4-di-tert-butylphenyl) phosphite (168) as the auxiliary antioxidant. Upon ultraviolet (UV) activation, these PA films possessed superior photochromism and light responsiveness. Importantly, unlike traditional physical blending photochromic polymers, SO2 was successfully covalently bonded into PA through reaction (PA6), effectively improving the fatigue resistance and thermal stability of the PA film. Doping with BHT, it further improved the photochromic properties of the compound film (PA7).
      PubDate: 2022-01-19
       
  • Low-melting point eutectic mixture of two bismaleimides containing
           polymethylene flexible and aramide-arylate mesogen groups

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      Abstract: In this work, low melting point binary mixtures of two bismaleimide (BMI) monomers are investigated. The bismaleimide monomers, designed B9 and B11, containing polymethylenic group in the center linked with aramide-arylate mesogenic groups through ester junctions, were synthesized with high yields. The binary mixtures were prepared by a solution process, with molar composition varied from 0.1 to 0.9. The differential scanning calorimetry analysis showed that the two monomers are miscible and the melting temperature of mixtures were a function of compositions. Two melting points were observed, except the mixture with determined composition around 0.56/0.44. This mixture showed only one melting temperature that was 23 °C lower than the lowest one of pure BMI (B9) and was considered as eutectic mixtures. This decrease in the melting temperature of the eutectic mixture allows to expand the processing window. Additionally, the blend didn’t affect the formation of mesogenic phase after crosslinking.
      PubDate: 2022-01-19
       
  • P(VDF-TrFE)/ZnO nanofiber composite based piezoelectric nanogenerator as
           self-powered sensor: fabrication and characterization

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      Abstract: P(VDF-TrFE)/ZnO based electrospun nanofiber composites have been developed using electrospinning method to cater the need of self-powered small wearable devices. Even though after huge work in this field, real-time commercial applications are very less because pure PVDF based electrospun mats have very low electrical outputs. In this paper, an effort is made to enhance the voltage output of the P(VDF-TrFE) based nanomats by adding ZnO nanoparticles into the viscous solution. The fiber composites have been made with the fixed ratio of dimethylformamide, acetone, matrix concentration, and different percentage concentration of ZnO nanopowder. The electrical output of the piezoelectric nanogenerators (PENG) have been measured using Digital Storage Oscilloscope under various loading conditions at room temperature. The results reveal that the nanofiber composite is formed defect-free at specific electrospinning conditions. The beta crystalline phase, specific surface area, rheological properties and dynamic modulus are significantly improved after the addition of nanofiller. A systematic and detailed analysis is conducted to assess the effect of ZnO nanoparticles. It has been observed that voltage output increases with the increment of ZnO weight percentage up to 7 and then decreases. The piezoelectric voltage and current of the piezoelectric nanogenerator device based on fiber composite is found 2.52 V and 20.8 µA whereas 1.04 V and 12.8 µA for the pristine P(VDF-TrFE) nanofiber under free fall loading conditions. The present results open the field of development of P(VDF-TrFE)/ZnO based nanomats and their use in sensors and actuators in the health and engineering industry.
      PubDate: 2022-01-18
       
  • Preparation of anionic waterborne polyurethane composites with silica from
           rice husk ash

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      Abstract: Anionic waterborne polyurethane (aWPU) composites were fabricated using hydoxytelechelic epoxidized natural rubber (HTENR) and silica, extracted from rice husk ash (RHA). Silica was then modified by poly(diallyldimethyl ammonium chloride) (PDDA), a cationic polymer. The PDDA content attached to the modified particles was about 4.43%. PDDA-SiO2 particles were smaller and the size distribution narrower than pristine SiO2 due to deagglomeration. The chemical structure of PDDA-SiO2 was confirmed by Fourier infrared spectroscopy (FTIR). PDDA-SiO2 particles were then loaded in aWPU at contents of 0.5 to 5.0% wt. using self-assembly by electrostatic interaction and hydrogen bonding between PDDA-SiO2 particle and aWPU. At PDDA-SiO2 loadings of 0.5 to 1.5% wt., aWPU/PDDA-SiO2 composites formed homogenous emulsions and transparent films. PDDA-SiO2 loadings of 3.0% wt. and 5.0% wt. produced PDDA-SiO2 agglomerations and filler clusters were seen in the obtained films due to poor dispersion of PDDA-SiO2 particles in the WPU matrix. PDDA-SiO2 incorporation increased Tg and raised the degradation temperature at 10% weight loss from 276 °C to 300 °C but reduced tensile strength compared to neat aWPU. Due to the insufficient interaction of aWPU and PDDA-SiO2 in case of physical mixing, sedimentation of PDDA-SiO2 particles in the PU matrix was observed but with PDDA modification the particles were uniformly embedded in nano-scale clusters.
      PubDate: 2022-01-17
       
  • Configuration of molecularly imprinted polymers for specific uptake of
           pharmaceutical in aqueous media through radical polymerization method

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      Abstract: Most of the MIP technology are used as sensors, especially for acetaminophen detection. However, there is a very limited study using MIP as acetaminophen separation. Thus, the current study elucidates the use of MIP for acetaminophen uptake in aqueous media. Application of MIP can reduce fouling. Acetaminophen, methacrylic acid (MAA), ethylene glycol dimethacrylate (EDGMA), 1,1’-Azobis(cyclohexanecarbonitrile) (ABCN) were used as template, functional monomer, cross-linker and initiator respectively. The molarity of cross-linker and functional monomer were varied for the study of imprinting effect of MIPs. High concentration of cross-linker exhibits poor binding ability of MIPs while high molarity of monomer demonstrated better performance in binding capacity. The optimum MIP was observed from template:monomer:cross-linker molar ratio at 1:58:15 with binding capacity of 5.2 mg/g polymer. Next, pristine PES and molecularly imprinted membrane (MIM) were fabricated using phase inversion method. MIM was prepared by adding optimum MIPs in casting solution for the study of antifouling properties as compared to pure membrane. The relative flux of MIM has showed a poor antifouling behaviour in real wastewater sample while demonstrating a good performance in synthetic solution. However, MIM has revealed a better rejection of acetaminophen in synthetic solution and aquaculture wastewater as compared to pristine membrane at 50.2 and 73.06% respectively.
      PubDate: 2022-01-17
       
  • Enhancement in forward osmosis performance of thin-film nanocomposite
           membrane using tannic acid-functionalized graphene oxide

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      Abstract: In this work, graphene oxide (GO) is functionalized with natural tannic acid macromolecules (GO-TA) and introduced as a novel hydrophilic modifier of thin-film nanocomposite (TFN) membranes. The active layers of the TFN membranes were modified with GO-TA using interfacial polymerization between m-phenylenediamine and trimesoyl chloride monomers. Afterward, the effects of surface modification on the surface hydrophilicity, roughness, morphologies, and surface chemistry of active layer were studied by water contact angle measurement, Fourier transform infrared spectrometer, scanning electron microscopy and atomic force microscopy, respectively. These analyses revealed that the surface characteristics of the TFN membranes were changed remarkably. In addition, the FO performance of the modified membranes was studied using DI water as feed solution and 1 M NaCl as draw solution in FO mode. Compared to the neat TFC (16.1 LMH), the GO-TA embedded TFN membranes present higher water flux (25.7 LMH), which could be ascribed to the variation of morphology, roughness, thickness, and hydrophilicity of the PA thin-film embedment of GO-TA. The satisfactory separation performance suggests more potential of the recently designed TFN-FO membrane for commercial application. Graphical abstract
      PubDate: 2022-01-17
       
  • Sustainable biocomposites produced from cotton stalk wastes: Effect of
           heat treatment

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      Abstract: The novelty of this study is to explore the effect of heat treatment of CS on the properties of biocomposites. 200°C, 300°C, 500°C, and burning of 500°C were selected to heat treat CS to obtain CS fillers, and the biocomposites were prepared using CS fillers and LLDPE. The heat treatment of CS can improve the interface bonding and compatibility of biocomposites by the results of FTIR, SEM, and CA. The crystal planes were not changed by the addition of CS fillers. The results of DSC and TGA showed that the heat treatment of CS promoted crystallization and improved the heat resistance of LLDPE. In addition, the flexural properties, tensile properties, stiffness, elasticity, creep resistance, and stress relaxation resistance were all increased by the heat treatment of CS, although it exhibited an adverse effect on the impact strength of LLDPE. After comparison, the best flexural strength and modulus (13.00 MPa and 0.75 GPa) were obtained in 200CSB-L due to the enhancement of CS rigidity by 200°C heat treatment. Also, 200CSB-L showed the best stiffness, elasticity, and dimensional stability than others. The best tensile strength and modulus (10.89 MPa and 0.26 GPa) were obtained in 500CSB-L due to its mechanical interlocking structure. The results of this study indicate that heat treatment would play an important role in biocomposites in terms of the benefit in mechanical properties.
      PubDate: 2022-01-17
       
  • Static and high strain rate behavior of aged virgin PVB

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      Abstract: In this paper, the static and dynamic constitutive behavior of aged and unaged virgin PVB were evaluated at different strain rates using static and impact drop-weight testing. The aged virgin PVB was subjected to random environmental conditions of different temperature and moisture levels. All static tests were performed at room temperature ranging between 21 and 32 °C. The results showed that the aged and unaged virgin PVB dynamic constitutive response consists of two linear parts. The first part is linearly elastic and independent of the rate of loading. However, the second linear part was found to be dependent on the strain rate. Aging significantly affected both the static and dynamic constitutive stress-strain relations. Comparing aged and unaged high-strain rate results showed that aging significantly affects the material response of the interlayer materials used in laminated glass, and subsequently, their dynamic response under blast loads. For the aged material tested in this paper, the strain rate effect was found to be less significant in the current test temperature range.
      PubDate: 2022-01-17
       
  • Brittle ductile transition of POE toughened HDPE and its lowest rigidity
           loss: effect of HDPE molecular weight

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      Abstract: In this study, the brittle-ductile transition of poly(ethylene-co-octene) (POE) toughened high density polyethylene (HDPE) was studied in terms of HDPE molecular weight, elastomer content and temperature. The relation among HDPE molecular weight, critical elastomer content and temperature, the relation among critical interparticle distance ( \({ID}_{c}\) ), HDPE molecular weight and temperature at critical brittle-ductile transition point were given. From these relations, the high impact HDPE blends with the lowest elastomer content, i.e. with the lowest rigidity loss, could be obtained. The results show that the lowest modulus loss for high impact HDPE/POE blend reduces markedly with the increase of HDPE molecule weight.
      PubDate: 2022-01-15
       
  • Enhancement of biofilm formation and microalgae growth by preparing
           cellulose film with rough surface

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      Abstract: A series of cellulose films with rough surface were prepared by dissolution and regeneration in the ionic liquid, 1-allyl-3-methylimidazolium chloride (AmimCl). The cellulose films possessed a rough surface with the maximum height difference (Sz) of 128–217 μm, a macroporous structure with a high porosity of 84.7%-90.5%, and a negative potential between -40.00 and -54.15 mV. Furthermore, the cellulose films exhibited excellent microalgae adhesion properties. After 18 days of attached Chlorella sp. cultivation experiments, the average productivities of C-A-120 films (C-A–X, X means the mesh number of the substrate) reached 20.80 g m−2 d−1), which is 2.69 times than that of the cellulose film with a smooth surface. The result indicates that the cellulose films with a rough surface and high water adsorption ratio have a huge potential in serving as the substrate of the attached microalgae cultivation to promote microalgae cells growth and biofilm formation.
      PubDate: 2022-01-14
       
  • Nontoxic double-network polymeric hybrid aerogel functionalized with
           reduced graphene oxide: Preparation, characterization, and evaluation as
           drug delivery agent

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      Abstract: Biopolymer aerogel microspheres based on K-carrageenan, Sodium-alginate, and reduced graphene oxide (SA/K-CG/rGO) were fabricated by crosslinking with divalent cation (Ca2+) and sol–gel technique followed by super critical drying. Then, the synthesized SA/K-CG/Ca2+-k+/rGO hybrid aerogel has been evaluated as an effective drug delivery system (DDS). The obtained aerogel was characterized using Fourier transformed infrared spectroscopy (FT-IR), X-ray Diffraction spectroscopy (XRD), Scanning Electron Microscope (SEM/EDS), and Brunauer–Emmett–Teller (BET). Amoxicillin as a model drug was immobilized in aerogel up to 94%. The release profile designated a continuous pH-dependent discharge at two studied pH scales (4.0, 5.5, 7.4 and 9.0). Finally, Korsmeyer-Peppas model and Higuchi model have been applied to evaluate the release kinetics, and it proves that the release of Amox from the hybrid aerogels is controlled by Fickian diffusion. The minimum inhibitory concentration (MIC) index for Aerogel/Amox with rGO was 250 µg/ml and 62 µg/ml for Streptomyces aureus and Escherichia coli, respectively. Besides, the cell viability assay did not show toxicity against normal endothelial cells. Collectively, the results determine the SA/K-CG/Ca2+-k+/rGO aerogel would be a potential material for the fabrication of pH-controlled drug delivery scaffold.
      PubDate: 2022-01-14
       
  • Synthesis of porous poly-HIPE @ nano silica core–shell composites and
           their application for oily wastewater treatment

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      Abstract: Oil contaminated wastewater is one of the major problem in the petroleum industry since it is not properly disposed. Drainage of such water either in seawater or soil may have a negative impact on life of human beings as well as other creatures. Therefore, this research work reports new approach for recovery of this type of wastewater via synthesis of core–shell nanocomposite structures as efficient adsorbents for oil droplets elimination. The core of these composites was made of different percentages of freshly synthesized nanoparticles of silica (2.5, 5 and 7.5 Wt. %). These cores were then shelled by polystyrene polymer through the usage of high internal phase emulsion (HIPE) polymerization technique. The three core–shell structures could effectively show increased percentages of oil removal from wastewater. However, the highest level of emulsified oil removal from wastewater (88.5%) could be attained by the composite which contained a silica percentage of 5%. This Nanocomposite, which is labeled as NC 5%, had exhibited specific surface area of 28.84 m2/g, pore volume equals 0.09587cm3/g and an average pore diameter of 18.71 nm. These nice surface characteristics of this Nanocomposite adsorbent are the reason behind its efficient oil capture from the oily wastewater sample.
      PubDate: 2022-01-13
       
  • Polycarboxylate-based water reducing admixture – clay compatibility;
           literature review

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      Abstract: Polycarboxylate-based water reducing admixtures (PCE) are widely used in concrete technology as they have superior properties such as ease of molecular structure change, high dispersing and water reduction capacity. Besides these positive effects, PCEs show a high sensitivity to clay particles. Surface adsorption and intercalation of PCEs with clays reduce their dispersing and water reduction capacity. The action-performance of PCE depends on the morphological properties of clays and the chemical structure of PCEs. Approaches such as increasing PCE dosage, adding polyethylene-glycol (PEG)—grafted lignin, and using clay tolerant sacrificial agents were proposed to avoid the adverse effect of clays on the action performance of PCE. However, as these approaches are not economical, there is a need to synthesize modified PCEs. In this study, PCE-clay interaction and methods to increase the action-performance of PCE in systems containing clay were investigated in detail. It was reported that the addition of functional groups to PCEs or use of PCEs with short polyethylene oxide (PEO) side chain lengths limit intercalation. In addition, it was emphasized that the size of the side chain shape that the clays cannot be included in the interlayer region prevents intercalation and increases the action-performance of PCE.
      PubDate: 2022-01-11
       
  • One-pot synthesis of polydopamine/Ag microspheres through microemulsion
           environment and its methylene blue removal application

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      Abstract: Organic dyes had caused many environmental problems. It penetrated underground water and caused widespread and long-term pollution. Although many works had been reported, there were still challenges for developing novel technologies of dyes eliminations. In this work, polydopamine/Ag microspheres were synthesized immediately through a convenient synthesis approach in emulsion solutions. Polydopamine microspheres were obtained through the microemulsion method at room temperature. Ag nanoparticles in-situ grew on the surface of modified microspheres. Through the MB solution test, polydopamine/Ag microspheres removed the MB from the solution quickly. Polydopamine/Ag microspheres also eliminated the MB at different temperatures, as well as concentrations and pH values. This method pointed out a new way to develop new materials for dyes elimination.
      PubDate: 2022-01-11
       
  • The structure and properties of porous poly(tetrafluoroethylene)

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      Abstract: Porous materials based on poly(tetrafluoroethylene) (PTFE) in a wide range of values of porosity (φ) 65 ÷ 90% have been formed by the method of leaching a porogen. The technological parameters required to produce PTFE materials of a spatially homogeneous porous structure have been determined. The mechanism of porous space formation has been proposed. The data characterizing the permeability of porous PTFE structures and the maximum effective diameters of the pore-connecting “interporous windows” have been obtained. The data for microhardness HSa for porous PTFE have been obtained. The temperature dependence of HSa was found to have a V-shaped valley in the region of the triclinic-hexagonal phase transition. However, the hexagonal – pseudo-hexagonal phase transition entails no features in the HSa (T) curves. It is shown that the estimation of HSa can be used as a check on the spatial homogeneity of a porous structure. The porous structure in the indentation area and its recovery after the indenter removal have been examined. The significance of temperature in the recovery process has been determined.
      PubDate: 2022-01-10
       
  • The microstructure-tensile property relationship of polyethylene resin for
           biaxially stretched film

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      Abstract: The market capacity of biaxially oriented polyethylene (BOPE) films increases rapidly (> 15% annually) due to the extremely excellent optical and economical feature, which meets the carbon neutrality requirements. Thus, the polyethylene resins selection is critical for BOPE films production and usage. In this contribution, we investigated the effects of molecular weight, branch chain distribution, melting behaviors, and crystallization behaviors of LLDPE resins on their biaxial stretchable properties for establishing the microstructure-mechanical property relationship and screening criteria for tenter-frame biaxially oriented polyethylene (TF-BOPE) resins. It was observed that a wider biaxial stretchable temperature range and a lower biaxial stretching temperature were required to facilitate the biaxial stretching process. A suitable molecular weight, a moderate crystallization rate, a thinner lamellae thickness, and a lower initial melting temperature are beneficial for the film stretch and production. Besides, A uniform lamellae thickness distribution in this molecular weight interval was conducive to expanding the biaxial stretch temperature range and reducing the films breakage.
      PubDate: 2022-01-08
       
 
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