Polymer Science, Series A最新文献_第9页

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

Self-Organization Initiated by Shear Flow of Mixtures of Polymer Melts 聚合物熔体混合物剪切流动引发的自组织

IF 1 4区化学

Polymer Science, Series A Pub Date : 2023-07-03 DOI: 10.1134/S0965545X23700670

I. V. Gumennyi, A. Ya. Malkin, V. G. Kulichikhin

{"title":"Self-Organization Initiated by Shear Flow of Mixtures of Polymer Melts","authors":"I. V. Gumennyi, A. Ya. Malkin, V. G. Kulichikhin","doi":"10.1134/S0965545X23700670","DOIUrl":"10.1134/S0965545X23700670","url":null,"abstract":"Structure formation during deformation of a mixture of melts of a thermoplastic polymer (polysulfone) and a liquid crystal polymer has been investigated by means of analytical scanning electron microscopy. Viscosity of the LC polymer at high shear rate has been significantly lower in comparison with the thermoplastic. The experiment has been performed at controlled volume flow under conditions of flow through a capillary at a high and low deformation rate. The principal result of the observations has been the statement of self-organization effect manifested as the phase separation and formation of the regions with the increased concentration of the LC polymer in the thermoplastic matrix. Such system has been an emulsion, and a conical converging flow has been formed at the transition from the wide cylinder of the capillary viscometer to a narrow capillary installed at its bottom. Such geometry of deformation has led to the appearance of a longitudinal flow with the formation of jets (fibers) in the extrudate bulk and the surface layer of the liquid crystal polymer. Effective viscosity of the mixture has been lowered in comparison with this of the thermoplastic, due to self-assembly of the LC polymer.","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"65 1","pages":"104 - 110"},"PeriodicalIF":1.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4471565","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

Hydrogels Based on Interpolymer Complexes of Sodium Alginate and Synthetic Polyacids 海藻酸钠与合成聚酸互聚配合物的水凝胶研究

IF 1 4区化学

Polymer Science, Series A Pub Date : 2023-07-03 DOI: 10.1134/S0965545X23700803

I. F. Volkova, E. S. Grigoryan, G. A. Shandryuk, M. Yu. Gorshkova

引用次数: 0

Insight to Cellulose–Polycarboxylic Acid Intermolecular Interactions Using TG and DSC Thermal Analysis Tools 洞察纤维素-聚羧酸分子间相互作用使用TG和DSC热分析工具

IF 1 4区化学

Polymer Science, Series A Pub Date : 2023-07-03 DOI: 10.1134/S0965545X23700773

Ananda S. Amarasekara, Yen Maroney Lawrence, Victor C. Nwankwo, Nabila Shamim

{"title":"Insight to Cellulose–Polycarboxylic Acid Intermolecular Interactions Using TG and DSC Thermal Analysis Tools","authors":"Ananda S. Amarasekara, Yen Maroney Lawrence, Victor C. Nwankwo, Nabila Shamim","doi":"10.1134/S0965545X23700773","DOIUrl":"10.1134/S0965545X23700773","url":null,"abstract":"<div><div><h3>\u0000 Abstract\u0000 </h3>Interactions between polycarboxylic acids and cellulose was evaluated by using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) profiles of their mixtures. TGA, DSC of cellulose and acids were recorded as baseline data and peak shifts were calculated by subtracting the peak maximum values of cellulose from that of cellulose-polycarboxylic acid mixtures. In TGA, DL-tartaric and citric acid with cellulose mixtures showed the largest positive shifts of +58 and +23°C in the derivative-TGA second peak. In addition, DL-tartaric and citric acid showed the smallest cellulose DTGA peak 1 area/peak 2 area ratios of 0.50 and 1.58 respectively. In DSC the largest cellulose dehydration peak shifts of +39 and +21°C were recorded for DL-tartaric and citric acids. In acids studied, polycarboxylic acids with one or more hydroxyl groups are more strongly interacting with cellulose in the solid state. The strong interactions of these acids are probably due to their ability to wrap round the polysaccharide chains forming multiple hydrogen bonding between –COOH and –OH of acid with –OH groups of cellulose.</div></div>","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"65 1","pages":"53 - 62"},"PeriodicalIF":1.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4125909","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

Field Stability Tests of Polyethylene Composites with Organomineral Biocidal Additives in Aqueous Environments 含有机无机杀菌剂的聚乙烯复合材料在水环境中的现场稳定性试验

IF 1 4区化学

Polymer Science, Series A Pub Date : 2023-07-03 DOI: 10.1134/S0965545X23700694

D. I. Mendeleev, S. A. Legkov, V. A. Tikhomirov, V. V. Kurenkov, M. A. Belous’ko, Q. C. Hoang, V. A. Gerasin

{"title":"Field Stability Tests of Polyethylene Composites with Organomineral Biocidal Additives in Aqueous Environments","authors":"D. I. Mendeleev, S. A. Legkov, V. A. Tikhomirov, V. V. Kurenkov, M. A. Belous’ko, Q. C. Hoang, V. A. Gerasin","doi":"10.1134/S0965545X23700694","DOIUrl":"10.1134/S0965545X23700694","url":null,"abstract":"Laboratory and field stability tests for a composite based on low-density polyethylene with an organomineral biocidal additive to the effects of aqueous media have been carried out. As an organomineral additive, polyhexamethyleneguanidine hydrochloride (a high-molecular-weight nontoxic biocide used in antiseptic solutions) immobilized on an inorganic carrier (montmorillonite) was used to improve the quality of distribution of the organomineral additive in a thermoplastic polymer (without loss of the biocidal properties of polyguanidine) and to prevent polyguanidine from being washed out of the composite during operation. The composition and structure of the composite with an organomineral additive remain unchanged after exposure to distilled water and model seawater. Field tests of the composites in seawater at a depth of 1.5 m in a tropical climate revealed that there were no polyguanidine leaching from the material even after 21 months of exposure of the samples. The samples without an organomineral additive undergo insignificant photo-oxidative aging, whereas the molecular structure of the polymer in the composite with the additive is unchanged. Thus, the studied organomineral additive has a photostabilizing effect on polyethylene. When the samples are exposed to seawater, there is a slight decrease in the strength of the samples and an increase in the elastic modulus, which is associated with an increase in the degree of crystallinity of polyethylene during aging.","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"65 1","pages":"111 - 118"},"PeriodicalIF":1.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4125907","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