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首页> 外文期刊>Colloid journal >A study of cryostructuring of polymer systems. 46. physicochemical properties and microstructure of poly(vinyl alcohol) cryogels formed from polymer solutions in mixtures of dimethyl sulfoxide with low-molecular-mass alcohols
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A study of cryostructuring of polymer systems. 46. physicochemical properties and microstructure of poly(vinyl alcohol) cryogels formed from polymer solutions in mixtures of dimethyl sulfoxide with low-molecular-mass alcohols

机译：聚合物体系冷冻水晶研究。 46.具有低分子量醇的聚合物溶液中聚合物溶液形成的聚（乙烯醇）冷冻蛋白的物理化学性质和微观结构

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摘要

Poly(vinyl alcohol) (PVA) cryogels (PVACGs) are obtained and studied. The PVACGs are formed by freezing-defrosting of polymer solutions in dimethyl sulfoxide (DMSO) or its mixtures with one of the first members of the series low-molecular-mass aliphatic alcohols (methanol, ethanol, n-propanol, and n-butanol). PVA content in these solutions is 100 g/L, while the concentration of an aliphatic alcohol is varied in a range of 0.44-2.55 mol/L depending on its nature. The polymer solutions are subjected to the cryogenic treatment at temperatures 30, 40, or 50A degrees C lower than the crystallization temperature of DMSO (+18.4A degrees C). The frozen samples are defrosted at a heating rate of 0.03A degrees C/min. It is shown that, in a certain range of lowmolecular-mass alcohol content in an initial system, its cryogenic treatment yields coarse-pored heterophase cryogels that have higher rigidity and heat endurance than those of DMSO-PVA cryogels. It has been shown that polymer cryoconcentration and phase separation play important roles in the formation of a cellular microstructure and an increase in the rigidity and heat endurance of PVACGs obtained in the presence of low-molecular-mass alcohols.
机译：获得并研究聚（乙烯醇）（PVA）冷冻胶（PVACGS）。通过将聚合物溶液（DMSO）的聚合物溶液或其混合物中的聚合物溶液的冻结除霜，与甲醇，乙醇，乙醇，正丙醇和正丁醇的混合物中的一种聚合物溶液的冷冻除霜形成。 。这些溶液中的PVA含量为100克/升，而脂族醇的浓度根据其性质而在0.44-2.55mol / L的范围内变化。将聚合物溶液在低于DMSO的结晶温度的温度30,40或50A℃下进行低温处理（+ 18.4Ac）。冷冻样品以0.03A℃/ min的加热速率进行除霜。结果表明，在初始系统中的一定范围的低分子 - 质量醇含量中，其低温处理产生粗焦的异相色碱基冷冻胶质，其具有比DMSO-PVA冷冻凝胶更高的刚性和耐热性。已经表明，聚合物低温浓缩和相分离在形成细胞微观结构的形成中起重要作用，并且在低分子质浓缩醇存在下获得的PVACG的刚性和耐热性的增加。

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  • 来源
    《Colloid journal》 |2017年第6期|共9页
  • 作者

    Lozinsky V. I.; Leonova I. M.; Ivanov R. V.; Bakeeva I. V.;

  • 作者单位

    Russian Acad Sci Nesmeynov Inst Organoelement Cpds Moscow 119991 Russia;

    Lomonosov State Univ Fine Chem Technol Moscow 119571 Russia;

    Russian Acad Sci Nesmeynov Inst Organoelement Cpds Moscow 119991 Russia;

    Lomonosov State Univ Fine Chem Technol Moscow 119571 Russia;

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  • 正文语种 eng
  • 中图分类 胶体;
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