嵌段比对左旋聚乳酸基立构复合物结晶行为及形貌的影响  

The influence of block ratio on crystallization behavior and morphology of PLLA-based stereocomplex

作　　者：陈晓浪[1,2] 白竹煜 吴一帆 陈少棚 CHEN Xiaolang;BAI Zhuyu;WU Yifan;CHEN Shaopeng(Key Laboratory of Advanced Materials Technology Ministry of Education, School of Materials Science andEngineering, Southwest Jiaotong University, Chengdu 610031, China;The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute ofSichuan University, Chengdu 610065, China)

机构地区：[1]西南交通大学材料科学与工程学院,材料先进技术教育部重点实验室,成都610031 [2]四川大学高分子研究所,高分子材料工程国家重点实验室,成都610065

出　　处：《功能材料》2020年第12期12142-12146,共5页Journal of Functional Materials

基　　金：四川省国际科技创新合作资助项目(2019YFH0047);四川大学高分子材料工程国家重点实验室开放课题资助项目(2017-4-02)。

摘　　要：聚乳酸具有优异的生物相容性及生物可降解性,是热塑性塑料理想的替代品,但结晶性、耐热性较差等缺点限制了其发展。本文以左旋聚乳酸(PLLA)为聚合物基体、右旋聚乳酸-聚乙二醇-右旋聚乳酸(PDLA-PEG-PDLA)三嵌段共聚物作为改性剂,通过溶液共混方法制备了PLLA/PDLA-PEG-PDLA共混物。通过红外光谱(FTIR)、X射线衍射(XRD)、差示扫描量热仪(DSC)和偏光显微镜(POM)研究了PDLA-PEG-PDLA的嵌段比变化对PLLA基共混物结构、结晶行为和结晶形貌的影响。结果表明,PDLA-PEG-PDLA三嵌段共聚物的添加,共混体系生成了PLA立构复合结构,其晶体结构、结晶行为与形貌与纯的PLLA相比均产生了较大的差异。而且,嵌段共聚物的嵌段比的改变也对PLLA/PDLA-PEG-PDLA共混物的结构、结晶行为与形貌产生了较大的影响。PLA is an ideal substitute for thermoplastic due to its excellent biocompatibility and biodegradability,but its poor crystallinity and low heat resistance limit its development.In this work,PLLA/PDLA-PEG-PDLA blends were prepared by solution blending using poly(L-lactide)(PLLA)as polymer matrix and poly(D-lactide)-poly(ethylene glycol)-poly(D-lactide)(PDLA-PEG-PDLA)triblock copolymer as the modifier.The influences of block ratio of PDLA-PEG-PDLA on the structure,crystallization behavior and crystal morphology of PLLA-based blends were studied by FTIR,XRD,DSC and POM.The results show that the PLA stereocomplex was formed due to the addition of PDLA-PEG-PDLA triblock copolymer,and its crystal structure,crystallization behavior and morphology were significantly different from that of pure PLLA.Moreover,the change of block ratio of block copolymer also had great influences on the structure,crystallization behavior and morphology of PLLA/PDLA-PEG-PDLA blends.

关 键 词：左旋聚乳酸 立构复合物 结晶行为 形貌 

分 类 号：TQ317.3[化学工程—高聚物工业]