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首页> 外文期刊>Journal of Applied Polymer Science >Polyamide4-block-poly(vinyl acetate) via a polyamide4 azo macromolecular initiator: Thermal and mechanical behavior, biodegradation, and morphology
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Polyamide4-block-poly(vinyl acetate) via a polyamide4 azo macromolecular initiator: Thermal and mechanical behavior, biodegradation, and morphology

机译：通过聚酰胺4偶氮大分子引发剂的聚酰胺4嵌段聚乙酸乙烯酯：热和机械行为，生物降解和形态

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摘要

A series of polyamide4-block-poly(vinyl acetate)s were synthesized by the radical polymerization of vinyl acetate (VAc) using an azo macromolecular initiator composed of polyamide4 (PA4). The block copolymers were investigated by examining their molecular weight, structure, thermal and mechanical properties, biodegradation, and the morphology of the film surface. The compositions and molecular weights (Mw) ranging from 46,800 to 163,700 g mol(-1) of the block copolymers varied linearly with increasing molar ratio of VAc to azo-PA4. The block copolymers have high melting points of 248.2-262.5 degrees C owing to PA4 blocks and heats of fusion, which were linearly dependent on the PA4 content. The mechanical properties of the block copolymers were monotonically dependent on the composition, i.e., increasing the PA4 content increased the tensile strength, whereas increasing the poly(vinyl acetate) content increased the elongation at break. The morphology of the block copolymers suggested the appearance of microphase separation. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42466.
机译：使用由聚酰胺4（PA4）组成的偶氮高分子引发剂，通过乙酸乙烯酯（VAc）的自由基聚合反应，合成了一系列聚酰胺4-嵌段-聚乙酸乙烯酯。通过检查嵌段共聚物的分子量，结构，热和机械性能，生物降解性以及膜表面的形态来研究其嵌段共聚物。嵌段共聚物的组成和分子量（Mw）为46,800至163,700 g mol（-1），随VAc与偶氮-PA4的摩尔比增加而线性变化。由于PA4嵌段和熔融热，该嵌段共聚物具有248.2-262.5℃的高熔点，这与PA4含量线性相关。嵌段共聚物的机械性能单调取决于组成，即，增加PA4含量增加了拉伸强度，而增加了聚（乙酸乙烯酯）含量增加了断裂伸长率。嵌段共聚物的形态表明出现了微相分离。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，42466。

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