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  
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Polymer Science Series B
Journal Prestige (SJR): 0.27
Citation Impact (citeScore): 1
Number of Followers: 4  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1560-0904 - ISSN (Online) 1555-6123
Published by Springer-Verlag Homepage  [2467 journals]
  • Features of Thermo-Oxidative Degradation and Pyrolysis of Nanocomposites
           Based on Porous Polyethylene and Silica

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      Abstract: — Effect of the structural mechanical modification via the crazing mechanism and composition of films based on HDPE nanocomposites and highly dispersed silica particles on the thermo-oxidative degradation and pyrolysis is studied. The incorporation of highly dispersed silica particles into the polymer matrix causes a reduction in the onset temperature of the intense weight loss of the composites by about 30°С and an increase in the temperature interval by 100°С under conditions of thermo-oxidative degradation. It is shown that in pyrolytic decomposition the HDPE‒SiO2 composite also starts to lose weight at lower temperatures (smaller by 50°С). Using various kinetic approaches to process the TGA curves the activation energy for each stage of thermal oxidation and pyrolysis is determined for structurally different HDPE-based samples. In the case of thermo-oxidative degradation, dependence of the activation energy on conversion is shown to be complex, thereby reflecting the multistage nature of the process. In pyrolysis, the activation energy is almost constant at all stages of the process. For various models of the processes, the activation energy is calculated by the Coats–Redfern method and the most probable mechanisms of thermal degradation and pyrolysis of the samples are proposed.
      PubDate: 2022-10-18
       
  • Anion Exchangers Based on 4-Vinylpyridine and Alkyl Dihalides: Synthesis
           and Application in the Sorption of Noble Metal Ions and the Addition of
           СО2 to Epoxides

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      Abstract: Strongly basic anion exchangers are synthesized by the spontaneous polymerization of 4-vinylpyridine under its interaction with alkyl dibromides. It is demonstrated that they can be successfully applied in the extraction of noble metal chloro complexes from acidic aqueous solutions and in the addition of СО2 to epoxides.
      PubDate: 2022-10-18
       
  • Preparation, Characterization, and Pyrolysis of Polycarbosilane with High
           Ceramic Yield and High Viscosity

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      Abstract: Liquid polycarbosilane substituted by allyl groups was prepared by the Grignard coupling reaction and reductive reaction synthesis with SiCl1.25(OCH3)1.75CH2Cl, Cl2CHSiMeCl2 and CH2=CHCH2Cl as the starting materials. The resultant polycarbosilanes were characterized by gel permeation chromatography, Fourier transform infrared and NMR spectroscopy. Moreover, the thermal properties and processing performance of polycarbosilanes were investigated. The ceramic yield of polycarbosilanes was about 77% at 1000°C, indicating that the polycarbosilanes have great potential to be promising precursors to SiC. With the increase of Cl2CHSiMeCl2 in the system, the viscosity of polycarbosilanes and C : Si ratio of ceramics increased, but the ceramic yield of polycarbosilanes decreased. Combining with its economical preparation, polycarbosilanes showed high potential as an economical SiC ceramic precursor for the fabrication of SiC matrix, coating and adhesives.
      PubDate: 2022-10-18
       
  • Preparation of Photocoated Polysiloxane Nanoparticles from
           3-Mercaptopropyl Trimethoxysilane with Furan Substitues by the
           Photoinitiated Thiol-Ene Reaction

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      Abstract: Adstract —Using one-pot synthesis, polysiloxane nanoparticles were successfully prepared from 3-mercaptopropyl trimethoxysilane. Next, the nanoparticles were photo-coated with furfuryl methacrylate by photo-initiated Thiol-Ene reaction for grafting furan substitutes on the surface of inorganic cores. In this process, polysiloxane core/poly(furfuryl methacrylate) shell nanoparticles were prepared at different irradiation times, and then their characteristic, morphological and thermal properties were investigated. Fourier transform infrared and solid-state 13C and 29Si nuclear magnetic resonance spectroscopies confirmed the successful photo-coating of the surfaces of nanoparticles. The size of coated nanoparticles prepared by irradiation for 24 h was measured as 186 nm in ethanol by dynamic light scattering, while the average diameter of 100 randomly selected pristine nanoparticles were determined at 42.8 nm by transmission electron microscopy. The coated polysiloxane nanoparticles were investigated by X-ray photoelectron spectroscopy and scanning electron microscopy, which revealed that they have the spherical core-shell structure.
      PubDate: 2022-10-18
       
  • Hydrogels of N-(2-Carboxyethyl)chitosan with Vanillin

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      Abstract: In developing the concept of stimuli-responsive biodegradable hydrogels synthesis using dynamic covalent chemistry, gelation in a solution of low molecular weight N-(2-carboxyethyl)chitosan in the presence of vanillin is studied. It is shown that unlike chitosan its carboxyalkylated derivative can be used for the synthesis of hydrogels with good mechanical properties and low cytotoxicity. An analysis of the effect of vanillin : N-(2-carboxyethyl)chitosan molar ratio on the degree of functionalization of the polymer by a crosslinking agent and the rheological properties of the polymer in 3 М urea solution shows that, along with hydrophobic interactions, intermolecular hydrogen bonds play an important role in stabilizing the structure of the obtained hydrogels.
      PubDate: 2022-10-18
       
  • Study on the Performance of Micro-Nano Structured Coatings Containing
           Silsesquioxane

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      Abstract: A micro-nano structure coating containing silsesquioxane was synthesized through suspension polymerization with the addition of ladder-like polysilsesquioxane, in which the nano-particles were nano-titanium dioxide. The light transmittance was increased after coating the surface of the polyethylene terephthalate film, which could reach 94.3%. The numerous hydrophilic groups on the surface of the micro-nano structure gave the coatings a hydrophilic effect, making the contact angle of the film less than 20° and the antifog ability was improved. The SEM images show that the size of the micro-nano structure was about 1 μm, which was conducive to the formation of nano-scale pores and the pores were the reason for the increase in light transmittance. In addition, due to the strong thermal stability of the ladder-like polysilsesquioxane, the second stage of decomposition of the product began at 400°C, which was much higher than that of pure acrylate polymer and made it more resistant to heat.
      PubDate: 2022-09-21
      DOI: 10.1134/S1560090422700336
       
  • DFT Calculations of Some Important Radicals Used in the Nitroxide-Mediated
           Polymerization and Their HOMO‒LUMO, Natural Bond Orbital, and Molecular
           Electrostatic Potential Comparative Analysis

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      Abstract: Nitroxide radicals are important organic compounds, the stability of which is governed by a degree of delocalization of an unpaired electron and steric hindrances in their molecules. The most stable radicals can be identified by theoretical methods. The B3PW91/6-31G + (d, p) density functional theory calculation for the 2,2,5,5-tetramethylpyrrolidine-N-oxyl nitroxide, (2,2,6,6-tetramethylpiperidin-1-yl)oxyl, (2,2,8,8-tetramethyl-4-oxoazocan-1-yl)oxidanyl, 1,1,3,3-tetramethylisoindolin-N-oxyl nitroxide, 2,2,10,10-tetraethyl-isoindolin-N-oxyl, di-tert-buthyl nitroxide, 2,2,5,5-tetramethyl-4-phenyl-3-azahexane-N-oxyl, and N-(2-methylpropyl)-N-(1-diethyl-phosphono-2,2-dimethylpropyl)-N-oxyl nitroxide radicals has been made. The FTIR and UV–Vis vibrational frequencies have been calculated by the same method. It is shown that the shortest N‒O bond length (1.2684 Å) is observed in the 1,1,3,3-tetramethylisoindolin-N-oxyl nitroxide radical. It has been found that the most stable of the investigated radicals is 2,2,10,10-tetraethyl-isoindolin-N-oxyl, which is indicated by the low EHOMO‒LUMO value for this substance. For all the examined nitroxides, the electron density, electrostatic potential surfaces, and natural bond orbital data have been obtained. The natural bond orbital analysis has confirmed the electron density delocalization within the nitroxide radicals.
      PubDate: 2022-09-21
      DOI: 10.1134/S156009042270035X
       
  • Green Synthesis Method of Poly[(2,5-diyl pyrrole)(4-hydroxy-3-methoxy
           benzylidene)] Semiconductor Polymer Using an Ecologic Catalyst

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      Abstract: A new synthesis of poly[(2,5-diyl pyrrole)(4-hydroxy-3-methoxy benzylidene)] copolymer was achieved via the polycondensation of vanillin and pyrrole in bulk and in solution using CH2Cl2 as solvent with acid exchanged montmorillonite clay called Maghnite-H+, a green catalyst initiator, non-toxic and recoverable by simple filtration. The effects of several parameters, such as the amount of catalyst, time and temperature of the polymerization and molar ratio of monomers on the polymers yield were studied. The conjugated polymer was characterized by means of 1H NMR, Fourier transform infrared spectroscopy and UV–Visible spectroscopy, as well as X-ray diffraction. The thermal properties of the prepared polymers were studied by thermogravimetric analysis. Poly[(2,5-diyl pyrrole)(4-hydroxy-3-methoxy benzylidene)] was found to be a semiconductive polymer.
      PubDate: 2022-09-21
      DOI: 10.1134/S1560090422700348
       
  • Novel Potential Precursor of Carbon Fiber Based on Copolymers of
           Acrylonitrile, Acrylamide, and Alkyl Acrylates

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      Abstract: Controlled synthesis of terpolymers of acrylonitrile with acrylamide and alkyl acrylate of similar composition but differing in the alkyl substituent (methyl, butyl, 2-ethylhexyl, and lauryl) has been performed for the first time via the reversible addition-fragmentation chain transfer polymerization under the action of dibenzyl trithiocarbonate. Investigation of thermal behavior of the terpolymers under inert atmosphere has allowed determination of the activation energy of the ionic cyclization as of ~80 kJ/mol irrespectively of the alkyl acrylate nature. Mechanism of chemical transformations of the terpolymers under isothermal treatment at 250°C has not differed from this known for the binary acrylonitrile–acrylamide and acrylonitrile–alkyl acrylate copolymers. At the same time, the rate of the polyconjugated structure formation has been higher in comparison with the analogous terpolymers with acrylic acid. The rate of the stabilization has changed along the following series of alkyl acrylates: methyl acrylate < butyl acrylate ≈ 2-ethylhexyl acrylate < lauryl acrylate. Concentration ranges of the dilute, semidilute, and concentrated solutions have been determined for the synthesized terpolymers.
      PubDate: 2022-09-21
      DOI: 10.1134/S1560090422700324
       
  • New Approach to the Synthesis of Thermoresponsive Polyrotaxanes

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      Abstract: A new approach to the synthesis of thermoresponsive polyrotaxanes, which is based on the termination of poly(2-ethyl-2-oxazoline) living chains by the end groups of polypseudorotaxane obtained from α,ω-diamino poly(ethylene glycol) 2000 and α-cyclodextrin, is proposed. It is shown that poly(2-ethyl-2-oxazoline) synthesized by cationic ring-opening polymerization interacts with polypseudorotaxane end groups and thus effectively blocks dissociation of the complex in solution. The structure of the synthesized copolymers is characterized in detail by 1Н and 13С spectroscopy, IR analysis, and GPC. It is demonstrated that the aqueous solutions of the synthesized polymers feature the lower critical solution temperature.
      PubDate: 2022-08-31
      DOI: 10.1134/S156009042270021X
       
  • Nitrones and Nitroso Compounds in the Coupling Reactions for the Synthesis
           of Macromolecular Structures Based on Polystyrene

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      Abstract: The capacity of the coupling reactions of polystyrene bearing an ω-terminal bromine group in the presence of various nitrones and nitroso compounds has been disclosed. As exemplified by the coupling using С-phenyl-N-tert-butylnitrone, acetonitrile and tetrahydrofuran have been found the best solvents of the probed series (toluene, ethyl acetate, benzene, acetonitrile, and tetrahydrofuran). The said solvents have revealed the strongest coordination ability towards the catalytical system based on copper(I) bromide and have afforded high coupling degree (above 90%) preserving low polydispersity of the synthesized samples. It has been shown that the nitroso compounds involved in the coupling with styrene favor the formation of terminal nitroxyl fragments. In contrast to nitroso compounds, the nitrones have afforded symmetrical high-molecular alkoxyamines bearing a nitroxyl fragment in the middle of the polymer chain.
      PubDate: 2022-08-31
      DOI: 10.1134/S1560090422700257
       
  • Facile Fabrication of Hollow Molecularly Imprinted Polymer Particles with
           Multicore Structure via Miniemulsion Polymerization

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      Abstract: The meticulous design on the internal structure of molecularly imprinted polymers particles has been widely concerned because of their unique recognition ability. In this study, we construct the molecularly imprinted polymers particles with hollow multicore structure for the specific recognition of bisphenol A via miniemulsion polymerization. The hollow multicore structure inside particles derives from the polymerization induced phase separation occurring within miniemulsion droplets. The formation mechanism of hollow multicore structure was analyzed in detail. The binding property of molecularly imprinted polymers was estimated by the binding kinetics, binding isotherm and special recognition. The molecularly imprinted polymers particles with hollow multicore structure exhibit remarkable binding kinetics because of low mass transfer resistance and desirable selectivity towards bisphenol A.
      PubDate: 2022-08-31
      DOI: 10.1134/S1560090422700269
       
  • Isolation and Physicochemical Characteristics of Pectin from Inonotus
           Hispidus

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      Abstract: — Pectin polysaccharides have been isolated from an unconventional natural source, the basidial mushrooms Inonotus hispidus of various substrates. Data on the content of free and esterified carboxyl groups and methoxyl groups; the degree of esterification; and UV and IR spectra are presented, as well as information on the size and molecular mass of pectin particles.
      PubDate: 2022-08-31
      DOI: 10.1134/S1560090422700221
       
  • Study on Lanthanum Cerium 6-Methyluracil As Heat Stabilizer of Polyvinyl
           Chloride

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      Abstract: Rare earth thermal stabilizers are a kind of newly discovered stabilizers, which are considered as a series of very promising stabilizers for inhibiting the degradation of PVC in the application and processing. Therefore, the continued exploration of new rare earth heat stabilizer is very necessary for scientific research and practical application. In this work, a new rare earth thermal stabilizer lanthanum cerium 6-methyluracil (LCMUA) was successfully synthesized via using cerium nitrate, lanthanum nitrate, 6-methyluracil (MUA) and aqueous ammonia as raw materials. And it was characterized by elemental analysis, FTIR, TG and other methods, the molecular formula of lanthanum cerium 6-methyluracil is confirmed as: La0.35Ce0.65(C5H4N2O2)NO3⋅2H2O. Subsequently, congo red tests and thermal aging tests of pristine LCMUA and LCMUA with calcium stearate (CaSt2), zinc stearate (ZnSt2), and pentaerythritol (PE) composite samples were performed, when LCMUA/CaSt2/PE is compounded with mass ratio of 3 : 1 : 1, the heat stabilization time reached 70 min, and the heat stabilization performance was the best, which is better compared to those of commercial CaSt2 and ZnSt2. The excellent experimental results can be attributed to the special absorption effect of LCMUA for hydrogen chloride gas derived from the thermal decomposition of PVC, thereby removing in time hydrogen chloride gas to restrain the PVC self-decomposition process caused by HCl gas.
      PubDate: 2022-08-31
      DOI: 10.1134/S1560090422700300
       
  • Synthesis of Bis-GMA Grafted Co-Polymer of Acrylic–Itaconic Acid and
           its Composite

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      Abstract: This study aims to develop a LED curable composite with higher compressive strength. We are reporting the synthesis of copolymers from acrylic and itaconic acid using simple free radical polymerization technique. The synthesized copolymer (acrylic-co-itaconic acid) was then grafted with bisphenol A-glycidyl methacrylate (Bis-GMA) using conventional condensation polymerization technique. The synthesized and purified copolymer was then characterized using FTIR, DSC, and TGA. We also synthesized glass ionomer powder using well established melt and quench method using various inorganic components, such as, SiO2, Al2O3, CaO, NaF, AlF3, P2O5, and Na3AlF6. The synthesized glass ionomer powder was characterized using powder X-ray diffraction and scanning electron microscopic techniques. Finally, we prepared the copolymer-glass ionomer composite by mixing the grafted copolymer and the glass ionomer with hydroxymethacrylate and camphorquinone. The resultant composite was cured with a LED light (440–480 nm) for 20 s and its surface morphology was studied using scanning electron microscopy. The compressive strength of the developed LED cured composite material and the commercially available Vitrebond (3M ESPE), a resin modified glass ionomer was compared using Universal Tensile Machine. It was found that the developed composite is 35% more strong in terms of compressive strength as compared to Vitrebond (3M ESPE).
      PubDate: 2022-08-01
       
  • Synthesis and Characterization of Ethylene
           Glycol-Polydimethylsiloxane-Polybutyl Methacrylate Copolymer

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      Abstract: — In this article, the octamethylcyclotetrasiloxane is introduced into ethylene glycol. The reaction is terminated using acrylic acid to obtain a linear polydimethylsiloxane intermediate comprising double bonds at the ends. The targeted copolymer is prepared by copolymerizing polydimethylsiloxane intermediate and butyl methacrylate. Additionally, blended-porous film is prepared by adding the copolymer to the cyclodextrin copolymer. The results reveal that the thermal stability of the copolymer increases with the increase of the polydimethylsiloxane content. The ethanol solution of the copolymer of a certain formulation has temperature sensitivity. The contact angle hysteresis of cyclodextrin copolymer is larger on the inclined surface at five degrees from the horizontal, but the blended-porous films all have low contact angle hysteresis, and the minimum contact angle hysteresis decreased to 2°. The main reason for the observed difference is that the presence of the copolymer makes the surface morphology of the film changed greatly. The blended-porous films have a waterproof and easy-to-slide surface.
      PubDate: 2022-08-01
       
  • Effect of Processing Temperature on the Thermal and Mechanical Properties
           of BPDA–PDA

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      Abstract: High heat resistant and stable dimensional PI films have been widely used in organic light emitting diode industry, therefore the comprehensive performance should be enhanced. The PI films of low CTE and high heat resistance were prepared with 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) and p-phenylenediamine (PDA) under different processing conditions. WAXD and FTIR were performed to characterize the microstructure of the films. DMA and TMA were conducted to investigate the mechanical and thermal properties of the films. The results showed that the density of the films increased and water absorption rate decreased with fabrication temperature as a result of the smectic structure. The smectic structure of the film attributed to the oriented polymer chains was observed in the DMA curves peaked at 470°C. The film would shrink at round the glass transition temperature as indicated by the TMA curves when it was prepared at relatively lower fabrication temperature, resulting in a larger CTE value compared with other prepared at high fabrication temperature. The 1% weight loss temperature increased with the fabrication temperature for the smectic structure. The tensile strength and elongation at break of the film increased with smectic density. The heat resistance and mechanical performance of bioriented films were the best among all the samples as the PI chains were stretched during the imidization process when all the edges of the film were fixed. The results obtained in this paper could offer practical and valuable references to optimization of processing parameters for the preparation of high performance PI films.
      PubDate: 2022-08-01
       
  • Enhancing Glass Transition Temperature of Poly(methylmethacrylate) by
           Incorporating Methacrylate-Functional Silane Grafted SiO2 Nanoparticles

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      Abstract: Nanocomposites attract the attention of researchers due to the increasing demand on materials having unique properties. Incorporation of nanoparticles into polymers considerably improves some materials properties such as thermal stability. In current study, PMMA/SiO2 hybrid nanocomposites including ungrafted and grafted silica nanoparticles have been prepared. The surfaces of SiO2 nanoparticles were grafted with 3-(methacryloyloxypropyl)trimethoxysilane (MPTS) and 3-(methacryloyloxypropyl)triethoxysilane (MPTES) by sol-gel technique. The structure, morphology and thermal properties of the obtained bulk materials were investigated by FTIR, SEM-EDX, TGA and DSC. Based on the studies of infrared spectroscopy, polymerization of MMA monomers was approved by following the intensity of acrylate group. Thermal characteristics of nanocomposite structures enhanced remarkably as SiO2 nanoparticles were introduced to the polymer matrix and glass transition temperature Tg value reached to the highest (166°C) for MPTES@20% SiO2-PMMA hybrid nanocomposite. According to SEM analysis, the most homogenous structure belonged to MPTES@20% SiO2-PMMA hybrid nanocomposite.
      PubDate: 2022-08-01
       
  • Possible Approaches to the Synthesis of Nanocomposites from a
           Liquid-Crystalline Polymer and CdSe/ZnS Quantum Dots

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      Abstract: Liquid-crystalline polymer poly[4-(ω-acryloyloxyhexyloxy)]benzoic acid is synthesized by reversible addition-fragmentation chain transfer polymerization. The ligand exchange reaction of core-shell CdSe/ZnS quantum dots with the gradient composition of constituent elements stabilized by oleic acid (combined with trioctylphosphine) affords 4-(ω-acryloyloxyhexyloxy)benzoic acid-based ligands which are bound through the interaction of carboxyl groups the surface of quantum dots via ionic bonding. The RAFT polymerization of 4-(ω-acryloyloxyhexyloxy)benzoic acid in solution in a mixture with initial quantum dots gives rise to a polymer in which a part of benzoic acid fragments is bound with quantum dots while another part retains the ability to form cyclic dimers. The polymerization product becomes insoluble in organic solvents which most probably indicates that the process of polymerization is accompanied by crosslinking. The direct mixing of quantum dots with poly[4-(ω-acryloyloxyhexyloxy)]benzoic acid in solution causes the partial replacement of quantum dots with macromolecule units while maintaining the liquid-crystalline state of the system in general at the content of quantum dots in the composite up to 50 wt %.
      PubDate: 2022-08-01
       
  • Isophorone Diisocyanate and Trimethylolpropane in-situ Prepared
           Hydroxyl-Terminated Block Copolymer Binder with Excellent Mechanical
           Properties

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      Abstract: A novel hydroxyl-terminated block copolymer (ITPP) binder was prepared through an in-situ preparation method. The new binder having similar block structure as HTPE binder, without complex synthesis process to prepare HTPE prepolymer intermediate, reduces cost and optimizes the preparation process. Thus, it is expected to be used as binder of insensitive propellant. Infrared spectroscopy, low-field nuclear magnetic resonance, and uniaxial tensile testing were used to investigate the curing networks and mechanical properties of the binder. The crosslink density Ve increased with the increase of TMP content and R value. The ultimate tensile strength σm of the in-situ-prepared ITPP binder is 20.50 MPa and the percentage of breaking elongation εb is 743.47%. Additionally, in order to study the pot life of the in-situ-prepared ITPP binder, the rheological properties of the curing reactions were also studied. Finally, compared to HTPE binder, the in-situ-prepared ITPP binder’s strength and elongation increase by 694 and 276%, respectively. Besides, the in-situ-prepared ITPP binder has better process performance. This exciting result greatly enhances that the in-situ-prepared ITPP binder has great potential for application in rocket propellant formulations.
      PubDate: 2022-08-01
       
 
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