聚硅氧烷微球扩链改性聚乳酸熔体流动行为的研究  

Melt Flow Behavior of Polysilsesquioxane Microspheres Chain-extended Poly(lactic acid)

作　　者：韩婷[1] 辛忠[2] 石尧麒[1,3] 孟鑫[1] 周帅[1] 

机构地区：[1]华东理工大学,上海市多相结构材料化学工程重点实验室,上海200237 [2]华东理工大学,化学工程联合国家重点实验室,上海200237 [3]上海化工研究院,上海市聚烯烃催化技术重点实验室,上海200062

出　　处：《中国塑料》2015年第7期20-27,共8页China Plastics

基　　金：国家自然科学基金项目(21306047);中央高校基础研究基金(WA1214051、WA1314051)

摘　　要：设计合成了带有甲基、巯基、环氧基、乙烯基、氨基、甲基丙烯酰氧丙基6种官能团的聚硅氧烷微球(PSQ),以2%(质量分数,下同)的浓度与聚乳酸(PLA)熔融混合。结果表明,PSQ可以通过扩链反应有效改善PLA的熔体流动行为,其中聚环氧基硅氧烷微球(PESQ)与PLA的反应活性最高,其熔体流动速率最低,为6.0g/10min,相对于纯PLA的14.1g/10min,减小了1/2以上;PESQ改性PLA的相对分子质量提高了70.1%;热失重5%的热分解温度提高了8℃;基本可抑制PLA在加工35min中的降解,冲击强度提高了2倍多。Polysilsesquioxane microspheres （PSQs） with six different functional groups, methyl, thiopropyl, epoxy, vinyl, aminopropyl, and methacryloxypropyl, was synthesized, which was introduced into polylactic acid （PLA） separately through melt processing, with the concentration of PSQs kept at 2%. It was found that the PSQs could effectively improve the melt flow behavior of PLA. Poly（epoxypropoxy）silsesquioxane （PESQ） possessed the highest reactivity with PLA in the six PSQs. It rendered PLA matrix the smallest melt flow rate, 6.0 g/10min, which contrasted to 14.1 g/10 min of neat PLA. The molecular weight of PLA could be extended to 1.7 folds larger. Thermal decomposition temperature of 5% weight-lost increased by 8℃, and thus could inhibit PLA degradation in processing for 35 min. In addition, PESQ could also increase the toughness of PLA matrix, with impact strength increased by one fold.

关 键 词：聚乳酸 熔体流动 聚硅氧烷微球 官能团 

分 类 号：O631.2[理学—高分子化学]