Abstract

The structure of film and fibrous materials based on poly(3-hydroxybutyrate)–polylactide blends has been studied. Ultrafine fibers have been spun by the electrospinning of a polymer solution; the films have been prepared by casting onto a glass substrate. Using optical microscopy, it has been shown that, depending on the fiber composition, the fibers have different diameters and geometries. The features of the crystalline and amorphous structures of the composites have been studied by the spin-probe electron paramagnetic resonance method and differential scanning calorimetry. The addition of 10 and 30% of polylactide to the composite leads to a slowdown of the molecular mobility in the film and fibrous materials and an increase in the enthalpy of melting of the ultrafine fibers. At a polylactide content in the blend of 30%, a kink in the dependences of the enthalpy of melting, correlation time, and radical concentration is observed. Annealing at a temperature of 140°C and exposure to an aqueous medium at 25 and 70°C for 3 h have a significant effect on the polymer structure: the enthalpy of melting and molecular dynamics increase, while the radical concentration in the ultrafine fibers and the film material decreases. Ozonolysis has a complex effect on the structure of the ultrafine fibers.

中文翻译：

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外因对聚(3-羟基丁酸酯)和聚乳酸基薄膜材料结构和动态参数影响的研究

摘要

已经研究了基于聚（3-羟基丁酸酯）-聚丙交酯共混物的薄膜和纤维材料的结构。超细纤维是通过聚合物溶液的静电纺丝纺成的；这些薄膜是通过浇铸到玻璃基板上制备的。使用光学显微镜，已经表明，根据纤维组成，纤维具有不同的直径和几何形状。通过自旋探针电子顺磁共振法和差示扫描量热法研究了复合材料的晶体和非晶结构的特征。向复合材料中加入 10% 和 30% 的聚丙交酯会导致薄膜和纤维材料中的分子移动速度减慢，并增加超细纤维的熔化焓。在共混物中聚乳酸含量为 30% 时，观察到熔化焓、相关时间和自由基浓度的相关性的扭结。在 140°C 的温度下退火并在 25 和 70°C 的水性介质中暴露 3 小时对聚合物结构有显着影响：熔融焓和分子动力学增加，而超细纤维中的自由基浓度和薄膜材料减少。臭氧分解对超细纤维的结构有复杂的影响。