Polymer Science, Series A最新文献_第2页

Effect of the Structure of the Modifying Polyolefin Fraction on the Deformation and Strength Properties of Reactor Polymer Compositions Based on Ultrahigh Molecular Weight Polyethylene 改性聚烯烃馏分结构对超高分子量聚乙烯反应器聚合物组合物变形和强度性能的影响

IF 1.1 4区化学

Polymer Science, Series A Pub Date : 2025-06-19 DOI: 10.1134/S0965545X25600425

E. E. Starchak, T. M. Ushakova, S. S. Gostev, V. G. Grinev, V. G. Krasheninnikov, L. A. Novokshonova

{"title":"Effect of the Structure of the Modifying Polyolefin Fraction on the Deformation and Strength Properties of Reactor Polymer Compositions Based on Ultrahigh Molecular Weight Polyethylene","authors":"E. E. Starchak, T. M. Ushakova, S. S. Gostev, V. G. Grinev, V. G. Krasheninnikov, L. A. Novokshonova","doi":"10.1134/S0965545X25600425","DOIUrl":"10.1134/S0965545X25600425","url":null,"abstract":"The morphology and tensile properties of reactor polymer compositions based on ultrahigh molecular weight polyethylene (UHMWPE, Mw = 106) with different contents of modifying polyolefin fractions have been studied. The compositions were obtained directly during the polymerization of ethylene using homogeneous catalysts. Modifying polyolefin fractions differed in their structure, molecular weight, and thermophysical properties and included linear HDPE with Mw = 5 × 104 and 1.5 × 105, as well as branched ethylene/hexene-1 copolymers with a 1-hexene content of 3, 10, and 20 mol %. The melting temperatures, the degrees of crystallinity of the materials and the dimensions of the crystallites were determined using the DSC and WAXS. The influence of morphology, physical and mechanical properties of modifying polyolefin fractions, their content on the stress-strain curves and tensile characteristics of reactor polymer compositions have been studied.","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"66 5","pages":"605 - 612"},"PeriodicalIF":1.1,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145167446","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

Relationship between Surface Energy and Gas Permeability of Polymer Films and Gas Separation Membranes 聚合物膜和气体分离膜表面能与透气性的关系

IF 1.1 4区化学

Polymer Science, Series A Pub Date : 2025-06-19 DOI: 10.1134/S0965545X25600437

Yu. G. Bogdanova, I. L. Borisov, E. A. Grushevenko, V. D. Dolzhikova, T. N. Rokhmanka, O. A. Ryabkova

{"title":"Relationship between Surface Energy and Gas Permeability of Polymer Films and Gas Separation Membranes","authors":"Yu. G. Bogdanova, I. L. Borisov, E. A. Grushevenko, V. D. Dolzhikova, T. N. Rokhmanka, O. A. Ryabkova","doi":"10.1134/S0965545X25600437","DOIUrl":"10.1134/S0965545X25600437","url":null,"abstract":"The specific free surface energy has been determined by the contact angle measurements for thin films of glassy polymers and dense membranes based on rubbery polymers. The obtained surface energy values have been compared with the coefficient of gas permeability towards nitrogen for the membranes based on investigated polymers. Regardless of the relaxation state of the polymers, linear correlation dependences have been found between the logarithm of the gas permeability coefficient and the nonpolar (dispersive) component of the surface energy of the films (membranes). For the films of glassy polymers, two parallel correlation dependences with close values of the slope tangent have been revealed. For the films of rubbery polymers, these dependences have been individual for each class of the substances. The slope tangents of the correlation dependences for glassy and rubbery polymers are opposite in sign, which is probably due to the difference in their relaxation states and, accordingly, the different nature of the free volume of these types of polymers. For the films based on poly[1-(trimethylsilyl)-1-propyne], the influence of the sample history on the value of the nonpolar component of the surface energy and gas permeability coefficient has been shown. The obtained results allow us to assume that the dispersive component of the surface energy of polymer films and dense polymer membranes can serve as a parameter for comparative evaluation of their gas permeability, and the contact angle measurements make it possible to trace the influence of the history on their surface and bulk properties.","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"66 5","pages":"655 - 670"},"PeriodicalIF":1.1,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145167477","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

Porous Structure of Hypercrosslinked Alpha-Methylstyrene Polymers 超交联α -甲基苯乙烯聚合物的多孔结构

IF 1.1 4区化学

Polymer Science, Series A Pub Date : 2025-06-11 DOI: 10.1134/S0965545X25600346

A. V. Pastukhov

{"title":"Porous Structure of Hypercrosslinked Alpha-Methylstyrene Polymers","authors":"A. V. Pastukhov","doi":"10.1134/S0965545X25600346","DOIUrl":"10.1134/S0965545X25600346","url":null,"abstract":"A series of stereoregular linear polymers of alpha-methylstyrene have been synthesized by low-temperature cationic polymerization in solution. Molecular weight distribution functions of the synthesized poly(alpha-methylstyrenes) are determined by gel permeation chromatography. Depending on the synthesis conditions, the average molecular weight of the polymers varies in the range from 140 × 103 to 490 × 103. According to X-ray phase analysis, the polymers under study are X-ray amorphous. The syndiotactic structure of polymer chains is established by proton magnetic resonance spectroscopy. Hypercrosslinked alpha-methylstyrene polymers are prepared in a 1% polymer solution in dichloroethane by crosslinking phenyl groups of the polymers with 4,4'-bis(chloromethyl)-1,1'-biphenyl in an amount of 0.5 to 2.0 mol per mol of the monomer unit by the Friedel–Crafts reaction. Low-temperature nitrogen adsorption measurements show that the hypercrosslinked poly(alpha-methylstyrenes) possess a well-developed micro–mesopore system. With increasing the degree of crosslinking of the polymers, the volume of ~2 nm micropores doubles but the average size of mesopores decreases from 8 to 4 nm and their volume fraction decreases from 80 to 60%. The specific pore surface area at the maximum degree of crosslinking is 900 m2/g, and the total volume of pores up to 150 nm is 0.94 cm3/g. Hypercrosslinked alpha-methylstyrene polymers are characterized by a bimodal pore system with predominant micropore fractions of ~2 nm and mesopore fractions of 4–8 nm. The synthesized hypercrosslinked polymers are promising for biomedical applications as adsorbents of toxic organic compounds.","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"66 5","pages":"613 - 622"},"PeriodicalIF":1.1,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164059","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

Possibility of Predicting the Thermal Stability of Copolymers Based on Thermogravimetric Analysis Data of Individual Polymers 基于单体聚合物热重分析数据预测共聚物热稳定性的可能性

IF 1.1 4区化学

Polymer Science, Series A Pub Date : 2025-06-11 DOI: 10.1134/S0965545X25600358

V. B. Ivanov, E. V. Kalugina, A. L. Pomerantsev, A. V. Samoryadov, M. S. Shebanov

{"title":"Possibility of Predicting the Thermal Stability of Copolymers Based on Thermogravimetric Analysis Data of Individual Polymers","authors":"V. B. Ivanov, E. V. Kalugina, A. L. Pomerantsev, A. V. Samoryadov, M. S. Shebanov","doi":"10.1134/S0965545X25600358","DOIUrl":"10.1134/S0965545X25600358","url":null,"abstract":"Thermal degradation of polyarylene ketone of the general formula –[–O–C6H4–C(=O)–C6H4–O–C6H4–R–C6H4]n– containing two species differing in chemical structure (R1 = –C(CH3)2– and R2 = ‒[(C6H4–C(=O)O)]–) and in the stability of the units, analyzed within the framework of a kinetic model that includes two parallel reactions involving units and products of their transformation. The predicted kinetic curve of mass loss was obtained by adding the experimental curves of degradation of individual polymers, taking into account the mass fraction of their units in the copolymer. This makes it possible to predict a relatively low temperature resistance of the copolymer, which is consistent with experimental data. The contributions of the three stages of degradation and their activation energies were estimated by the method of nonlinear regression analysis, which includes simultaneous processing of all kinetic information obtained at different heating rates. The correspondence of the found values of the activation energies of the copolymer to the activation energies of the degradation of individual polymers confirms the adequacy of the proposed process model.","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"66 5","pages":"623 - 630"},"PeriodicalIF":1.1,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164057","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}

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Retraction Note: Characterization of Modified Styrene-co-2-acrylamido-2-methylpropane Sulfonic Acid Magnetite Nanoparticles 附注：改性苯乙烯-co-2-丙烯酰胺-2-甲基丙烷磺酸磁铁矿纳米颗粒的表征

IF 1.1 4区化学

Polymer Science, Series A Pub Date : 2025-06-01 DOI: 10.1134/S0965545X24020019

Ayman M. Atta, Magda Akel, R. A. Elghazawy, Mohamed Alaa

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Investigation on Morphological and Structural Evolution during Stretching Process of Polyethylene Terephthalate Glycol Films with Different Molecular Structures 不同分子结构聚对苯二甲酸乙二醇酯薄膜拉伸过程中形态和结构演变的研究

IF 1.1 4区化学

Polymer Science, Series A Pub Date : 2025-06-01 DOI: 10.1134/S0965545X25600176

Jiangfeng Pei

{"title":"Investigation on Morphological and Structural Evolution during Stretching Process of Polyethylene Terephthalate Glycol Films with Different Molecular Structures","authors":"Jiangfeng Pei","doi":"10.1134/S0965545X25600176","DOIUrl":"10.1134/S0965545X25600176","url":null,"abstract":"Three polyethylene terephthalate glycol (PETG) resins with different molecular structures were used, and their molecular structures (comonomer types, comonomer content), fluidity, and crystallinity were comparatively studied. They were further molded into cast films and subjected to tensile tests at different temperatures, and a series of samples stretched to different ratios were prepared. The tensile behavior and morphological evolution mechanism of PETG cast films during stretching process were revealed by means of differential scanning calorimetry (DSC), two-dimensional small angle X-ray scattering (2D-SAXS), X-ray diffraction (XRD), polarized IR spectra, and tensile performance test. The results showed that the tensile stress-strain curves of the three PETG cast films are quite different, and PETG-A and PETG-C undergo more obvious stretch-induced crystallization behavior during the stretching process. With the increase of the stretching ratio, PETG-B is most likely to be oriented under the external force; while PETG-C is less likely to be highly oriented. Although PETG-A will also be oriented under stretching, its degree of orientation is significantly lower than that of PETG-B. After pre-stretching, the three PETG cast films were stretched again in different directions respectively, and the stress-strain curves of the secondary stretching was investigated. It was found that the secondary stretching behavior was closely related to the orientation and crystallization behavior during the initial pre-stretching. The related mechanism was discussed.","PeriodicalId":738,"journal":{"name":"Polymer Science, Series A","volume":"66 5","pages":"636 - 649"},"PeriodicalIF":1.1,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145160579","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

Dependence of the Stoichiometry of Poly(vinyl alcohol) Complexes with Lithium Chloride and Bromide on Its Degree of Saponification 聚乙烯醇与氯化锂、溴化物配合物的化学计量学与皂化度的关系

IF 1.1 4区化学

Polymer Science, Series A Pub Date : 2025-06-01 DOI: 10.1134/S0965545X25600280

I. Yu. Prosanov, A. V. Ukhina, T. A. Borisenko, V. A. Volodin

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Study of Properties of Polymer Film Materials Based on Polycaprolactone–Chitosan–Ceftriaxone Blends 聚己内酯-壳聚糖-头孢曲松共混聚合物薄膜材料的性能研究

IF 1.1 4区化学

Polymer Science, Series A Pub Date : 2025-06-01 DOI: 10.1134/S0965545X25600279

E. R. Bakirova, A. B. Sunargulov, R. Yu. Lazdin, A. S. Shurshina, E. I. Kulish

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Endowed Polyimide Films with Fluorescence Properties by Introducing Yttrium Oxide Powder 引入氧化钇粉末赋予聚酰亚胺薄膜荧光特性

IF 1 4区化学

Polymer Science, Series A Pub Date : 2025-03-09 DOI: 10.1134/S0965545X25600073

Jianrong Hang, Jiajia Zheng, Juan Yu, Pei Huang, Xiaodong Wang

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Carboxymethylcellulose-Based Dual-Network Ion-Conducting Hydrogel for Flexible Strain Sensors 基于羧甲基纤维素的柔性应变传感器双网络离子导电水凝胶

IF 1 4区化学

Polymer Science, Series A Pub Date : 2025-03-09 DOI: 10.1134/S0965545X25600085

Xinmin Huang, Yaning Wang, Xiaobin Tan, Lianhe Yang

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