Polymer Science, Series A最新文献_第10页

Modifying Effect of Polyethylene Fractions of Different Molecular Weights on the Morphology and Properties of Reactor Polymer Compositions Based on Ultrahigh Molecular Weight Polyethylene 不同分子量聚乙烯馏分对基于超高分子量聚乙烯的反应器聚合物组合物形貌和性能的改性作用

IF 1 4区化学

Polymer Science, Series A Pub Date : 2023-08-09 DOI: 10.1134/S0965545X23700992

S. S. Gostev, E. E. Starchak, T. M. Ushakova, V. G. Grinev, V. G. Krasheninnikov, A. Ya. Gorenberg, D. N. Vtyurina, T. A. Ladygina, L. A. Novokshonova

{"title":"Modifying Effect of Polyethylene Fractions of Different Molecular Weights on the Morphology and Properties of Reactor Polymer Compositions Based on Ultrahigh Molecular Weight Polyethylene","authors":"S. S. Gostev, E. E. Starchak, T. M. Ushakova, V. G. Grinev, V. G. Krasheninnikov, A. Ya. Gorenberg, D. N. Vtyurina, T. A. Ladygina, L. A. Novokshonova","doi":"10.1134/S0965545X23700992","DOIUrl":"10.1134/S0965545X23700992","url":null,"abstract":"Reactor polymer compositions (RPCs) based on UHMWPE with Mw = 1000 kg mol–1 and low molecular weight HDPE (LMWPE) were studied. Two series of UHMWPE compositions were used to determine the influence of the molecular weight and properties of the LMWPE fraction on the morpho-logy, mechanical and rheological properties of UHMWPE/LMWPE. Сompositions, including from 10 to 80 wt % UHMWPE with Mw = 160 kg mol–1 (PE-160) were obtained in a two-stage process of ethylene polymerization with a metallocene catalyst. They differed in the order of introduction of PE-160 into UHMWPE (PE-160/UHMWPE and UHMWPE/PE-160). Compositions of UHMWPE and LMWPE with Mw = 48 kg mol–1 (PE-48/UHMWPE) with PE-48 content from 6 to 30 wt % were synthesized in a single-stage polymerization of ethylene in the presence of a tandem catalyst. A comparison of the shape and size of particles of nascent polymer products was made using the SEM method. The morphology, tensile, dynamic mechanical and rheological properties of RPC have been studied depending on the method of their preparation, the content of the low molecular weight fraction, its molecular weight and physical and mechanical properties. An increase in the proportion of PE-160 and PE-48 in PE-160/UHMWPE and PE‑48/UHMWPE leads to an increase in RPC crystallinity, tensile modulus and dynamic mechanical modulus with significant deviations from the additivity rule.","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"65 4","pages":"386 - 395"},"PeriodicalIF":1.0,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76562117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Mechanical Properties of Anisotropic Magnetic Elastomers 各向异性磁性弹性体的力学性能

IF 1 4区化学

Polymer Science, Series A Pub Date : 2023-07-17 DOI: 10.1134/S0965545X23700797

G. V. Stepanov, S. I. Kirichenko, E. E. Makhaeva, E. Yu. Kramarenko

引用次数: 0

Preparation of Nonwoven Carbon Materials from Fabrics Based on Flax Cellulose and Viscose Fibers 以亚麻纤维素和粘胶纤维为基料制备无纺布碳材料

IF 1 4区化学

Polymer Science, Series A Pub Date : 2023-07-10 DOI: 10.1134/S0965545X23700979

I. S. Makarov, A. G. Smyslov, D. N. Chernenko, M. I. Vinogradov, S. A. Legkov, I. S. Levin, H. A. Arkharova, V. G. Kulichikhin

{"title":"Preparation of Nonwoven Carbon Materials from Fabrics Based on Flax Cellulose and Viscose Fibers","authors":"I. S. Makarov, A. G. Smyslov, D. N. Chernenko, M. I. Vinogradov, S. A. Legkov, I. S. Levin, H. A. Arkharova, V. G. Kulichikhin","doi":"10.1134/S0965545X23700979","DOIUrl":"10.1134/S0965545X23700979","url":null,"abstract":"A method for obtaining nonwoven carbon materials by the staged heat treatment of cellulose felt is developed. Fabrics produced from fibrous flax cellulose and viscose fibers by needle punching are used as nonwoven precursors. To obtain carbon fabric precursors the optimum ratios of components are chosen from the data on the formation of nonwoven fabrics and the thermal analysis of various blend formulations. It is shown that the content of flax fibers in the system should be at least 50%. Viscose fibers play the role of a reinforcing material and so far cannot be fully excluded from the system. With an increase in the content of flax cellulose the value of carbon yield grows. The mechanical properties of the carbon felt are provided by the physical network of friction and dispersion contacts between individual fibers. Upon heat treatment of the composite nonwoven material, the morphological features of precursor fibers remain unchanged. The interplanar distances of carbon layers in the carbon material are calculated using X-ray diffraction analysis and transmission electron microscopy. The fraction of carbon upon heat treatment to 1700°С is at least 90%, and after graphitization to 2400°С the purity of the product is above 99%. The maximum values of carbon yield at this temperature may be as high as 25‒27%. The coefficients of thermal conductivity of the carbon felt are measured, and the values obtained are 30% lower than the corresponding parameters of carbon fabrics.","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"65 3","pages":"246 - 255"},"PeriodicalIF":1.0,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4729393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Influence of Ultralow Content of Graphene on Wear-Resistant Properties of Composites Based on Ultra-High Molecular Weight Polyethylene 超低含量石墨烯对超高分子量聚乙烯基复合材料耐磨性能的影响

IF 1 4区化学

Polymer Science, Series A Pub Date : 2023-07-10 DOI: 10.1134/S0965545X23700967

A. S. Zabolotnov, S. S. Gostev, M. V. Gudkov, L. A. Novokshonova, R. I. Chelmodeev

引用次数: 0

Structural Evolution and Electrical Property of Polyacrylonitrile-Based Nano and Micro Carbon Fibers 聚丙烯腈基纳米微碳纤维的结构演变与电学性能

IF 1 4区化学

Polymer Science, Series A Pub Date : 2023-07-03 DOI: 10.1134/S0965545X23700712

Yuexin Gao, Yanyan Wang, Siyu Liu, Sijia Zhong, Meijie Yu, Chengguo Wang

{"title":"Structural Evolution and Electrical Property of Polyacrylonitrile-Based Nano and Micro Carbon Fibers","authors":"Yuexin Gao, Yanyan Wang, Siyu Liu, Sijia Zhong, Meijie Yu, Chengguo Wang","doi":"10.1134/S0965545X23700712","DOIUrl":"10.1134/S0965545X23700712","url":null,"abstract":"Most commercial polyacrylonitrile-based carbon fibers are microfibers derived from the wet-spinning or dry-jet wet-spinning polyacrylonitrile fiber. Nano carbon fibers made by electrospinning and post-processing have many advantages over micro carbon fibers in performance, but the research on nano carbon fibers is far from enough. In this work, polyacrylonitrile-based nano- and microfibers obtained by electrospinning and dry-jet wet spinning are converted into nano- and micro carbon fibers under the same pre-oxidation and carbonization conditions. The evolution of morphology, elemental content, functional groups and apparent crystallinity of the two size-scale fibers before and after carbonization are studied. The relationship between their structure and their electrical property is speculated. The results show that pre-oxidized nano fibers’ absorption of visible light is much weaker than microfibers. The oxygen content of the pre-oxidized nanofibers is higher, and the carbon content in the carbonization process is always higher than that of microfibers. The nanofibers are more accessible to crystallize than microfibers. They can obtain better electrical properties than microfibers and have a more excellent application prospect as conductive fillers in antistatic composites.","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"65 1","pages":"27 - 35"},"PeriodicalIF":1.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4471564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Binding of Curcumin to Star Polyoxazolines in Aqueous Solutions 水溶液中姜黄素与星型多恶唑啉的结合

IF 1 4区化学

Polymer Science, Series A Pub Date : 2023-07-03 DOI: 10.1134/S0965545X23700657

A. N. Blokhin, N. D. Kozina, A. B. Razina, A. V. Tenkovtsev

引用次数: 0

Methacrylate Single-Ion Conducting Block Copolymers: Effect of the Chemical Structure on Conductivity and Morphological Organization 甲基丙烯酸酯单离子导电嵌段共聚物:化学结构对电导率和形态组织的影响

IF 1 4区化学

Polymer Science, Series A Pub Date : 2023-07-03 DOI: 10.1134/S0965545X2370075X

E. I. Lozinskaya, D. O. Ponkratov, A. S. Shaplov, I. A. Malyshkina, D. R. Streltsov, A. V. Bakirov

{"title":"Methacrylate Single-Ion Conducting Block Copolymers: Effect of the Chemical Structure on Conductivity and Morphological Organization","authors":"E. I. Lozinskaya, D. O. Ponkratov, A. S. Shaplov, I. A. Malyshkina, D. R. Streltsov, A. V. Bakirov","doi":"10.1134/S0965545X2370075X","DOIUrl":"10.1134/S0965545X2370075X","url":null,"abstract":"A series of novel anionic block copolymers, in which the neutral block is formed by 2-phenylethyl methacrylate (PEM) and the ionic block is prepared via statistical copolymerization of lithium 1-[3-(methacryloyloxy)-propylsulfonyl]-1-(trifluoromethanesulfonyl)imide (LiM) and methyl ether of poly(ethylene glycol) methacrylate (PEGM) have been synthesized. The effects of chemical structure, composition, and molecular mass of the blocks on ionic conductivity and thermal properties of the poly[PEM–block–(LiM–stat–PEGM)] block copolymers have been investigated. It has been found by means of small-angle X-ray scattering that the introduction of a small fraction of the lithium-containing units (~7 mol %) in the structure of neutral poly[PEM–block–PEGM] copolymer leads to microphase separation and ordering of the system. Combined small-angle X-ray scattering and atomic force microscopy data have evidenced the formation of lamellar structure with the interplanar distance of d ~ 28 nm.","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"65 1","pages":"36 - 52"},"PeriodicalIF":1.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4125174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

ESR Investigation of the Interaction of Copper Nanoparticles Precursors with Polyethylenimine 纳米铜前驱体与聚乙烯亚胺相互作用的ESR研究

IF 1 4区化学

Polymer Science, Series A Pub Date : 2023-07-03 DOI: 10.1134/S0965545X23700700

M. V. Motyakin, A. S. Ozerin, I. S. Ionova, F. S. Radchenko, I. A. Novakov

引用次数: 0

Phase Transitions and Structure of the Hydroxypropyl Cellulose–Water–Ethanol System 羟丙基纤维素-水-乙醇体系的相变和结构

IF 1 4区化学

Polymer Science, Series A Pub Date : 2023-07-03 DOI: 10.1134/S0965545X23700748

S. A. Vshivkov, E. V. Rusinova

引用次数: 0

Revisiting the Problem of Adsorption/Desorption Isotherms on Hypercrosslinked Polymers 高交联聚合物吸附/解吸等温线问题的再探讨

IF 1 4区化学

Polymer Science, Series A Pub Date : 2023-07-03 DOI: 10.1134/S0965545X23700682

V. A. Davankov, Z. K. Blinnikova, A. Yu. Popov, Yu. A. Davidovich, M. P. Tsyurupa

{"title":"Revisiting the Problem of Adsorption/Desorption Isotherms on Hypercrosslinked Polymers","authors":"V. A. Davankov, Z. K. Blinnikova, A. Yu. Popov, Yu. A. Davidovich, M. P. Tsyurupa","doi":"10.1134/S0965545X23700682","DOIUrl":"10.1134/S0965545X23700682","url":null,"abstract":"This contribution is focused on the examination of adsorption/desorptiom isotherms for nitrogen at 77 K and benzene vapors at 293 K on various hypercrosslinked polystyrene (HP) resins. All isotherms for N2 are identical in their shapes and are characterized by a steep rise of the adsorption branch at low p/p0 followed by a less steep hoisting of the branch with increasing relative pressure. Adsorption isotherm for benzene demonstrates an ill-defined convex initial part followed by a significant rise in network loading with further increase in relative pressure. In the both cases we assume the rise in adsorption to reflect the relaxation of inner stresses with the simultaneous increase in the volume of networks. The distinction between the two types of isotherms is conditioned upon the fact that in the networks cooled down to 77 K stresses are stronger and the initial volume of the sample is more compressed. The amounts of nitrogen and benzene absorbed at relative pressure of 0.95 are the same order of magnitude, indicating similar swelling of HP in the both adsorbates. The adsorption behaviors of hypercrosslinked PIM-type polymers are governed by the same effects.","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"65 1","pages":"15 - 21"},"PeriodicalIF":1.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4125399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0