聚乳酸立构复合物的合成与表征  

Synthesis and Characterization of Poly(lactic acid) Stereocomplex

作　　者：李菁[1] 陈大凯[1] 任杰[1,2] 

机构地区：[1]同济大学材料科学与工程学院纳米与生物高分子材料研究所,上海200092 [2]同济大学先进土木工程材料教育部重点实验室,上海200092

出　　处：《塑料》2011年第3期73-75,共3页Plastics

基　　金：上海市优秀学科带头人计划(07XD14029);上海市国际科技合作基金项目(075207046)

摘　　要：采用直接熔融缩聚法制备不同分子量特征的聚乳酸预聚物,将分子量相近的PLLA和PDLA预聚物等量混合,经过熔融共混后再进行固相聚合,制备得到聚乳酸立构复合物。结果表明:sc-PLA与两种PLA预聚物相比,熔点提高50℃左右,通过固相聚合PLA的分子量也得到显著提高。该方法工艺简单,产物纯净,是改善聚乳酸耐热性的一种有效途径。PLA prepolymcrs with different molecular weight were prepared by direct melt polycondensation. Then PLLA and PDLA prepolymers with a similar molecular weight were mixed equally, after melt blending and solid-state polycondensation, the stereocomplex structure of PLA was prepared. The result showed that the melt point of sc-PLA was increased by nearly 50℃ compared with PLLA and PDLA prepolymers, the molecular weight of PLA was increased by solid- state polycondensation. An effective way to improve the heat resistance of PLA was offered.

关 键 词：聚乳酸立构复合物 熔融共混 耐热性 直接缩聚 固相聚合 

分 类 号：Q946.816[生物学—植物学]