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OALib Journal期刊
ISSN: 2333-9721
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pmma-pla-pmma三嵌段共聚物的制备
, PP. 22-25
Keywords: 原子转移自由基聚合,聚甲基丙烯酸甲酯,聚乳酸
Abstract:
以双溴端聚乳酸(br-pla-br)为引发剂,通过原子转移自由基聚合法(atrp)合成聚甲基丙烯酸甲酯-聚乳酸-聚甲基丙烯酸甲酯(pmma-pla-pmma)三嵌段共聚物。考察不同单体与引发剂比例对共聚产物相对分子质量的影响,结果表明:共聚产物相对分子质量随单体比例的增加呈线性增加及随时间延长而递增,但相对分子质量分布恒定,符合atrp活性、可控聚合的特点。热分析结果表明:该共聚产物的热分解温度和玻璃化转变温度较之聚乳酸均有明显的提高,说明该嵌段共聚物提高了聚乳酸的热稳定性。
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