SIOC English
化学学报
高级检索

化学学报 ›› 2011, Vol. 69 ›› Issue (06): 719-724. 上一篇    下一篇

研究论文

聚乳酸基可降解形状记忆聚合物的制备、结构与性能

马艳1，石文鹏1，赵辰阳1，杨冬梅1，逯琪1，李速明1，涂建军2，王巍2，范仲勇*,1   

  1. (1 复旦大学材料科学系 上海 200433)
    (2中国石油化工股份有限公司上海石油化工研究院 上海 201208)
  • 投稿日期:2010-09-15 修回日期:2017-01-31 发布日期:2010-11-15
  • 通讯作者: 范仲勇 E-mail:zyfan@fudan.edu.cn
  • 基金资助:

    国家自然科学基金项目;国家自然科学基金项目;上海市重点学科建设项目资助

Synthesis, Structure, and Properties of Polylactide-Based Degradable Shape Memory Polymers

Ma Yan1 Shi Wenpeng1 Zhao Chenyang1 Yang Dongmei1 Lu Qi1 Li Suming1 Tu Jianjun2 Wang Wei2 Fan Zhongyong*,1   

  1. (1 Department of Materials Science, Fudan University, Shanghai 200433)
    (2 Shanghai Research Institute of Petrochemical Technology, China Petroleum and Chemical Corporation, Shanghai 201208)
  • Received:2010-09-15 Revised:2017-01-31 Published:2010-11-15

被引次数

14

以三枝化低不饱和度聚环氧丙烷/聚乳酸两嵌段共聚物(POLA)为原料, 甲苯二异氰酸酯(TDI)交联制备可降解聚环氧丙烷/聚乳酸基聚氨酯(POLA-PU). 通过对POLA共聚物序列结构的调控, 制备了由高模量低断裂伸长率的脆性到低模量高断裂伸长率的韧性POLA-PU可降解形状记忆材料. 由TMA测得POLA-PU的形变温度为96～153 ℃. POLA-PU试样在140 ℃的形状记忆恢复时间不超过20 s. 在200%拉伸形变条件下, POLA-PU的形变固定率在65%～100%之间, 形变回复率均可达100%. 实验表明, 形状记忆行为取决于链的交联密度, 记忆效应归属于不同温度下柔性链的构象熵变化. 降解实验结果表明, 聚乳酸链段的引入赋予了该形状记忆材料良好的降解性能, 且随着聚乳酸含量的降低而下降.

关键词: 聚醚, 聚乳酸, 聚氨酯, 形状记忆, 降解

A series of degradable poly(propylene oxide)-poly(L-lactide)-polyurethane (POLA-PU) shape memory polymers were synthesized by crosslinking triarm POLA diblock copolymers with tolylene diisocyanate (TDI). The mechanical properties of POLA-PU could be conveniently adjusted through variation of composition to prepare materials from high modulus and low elongation at break to low modulus and high elongation at break. The transition temperatures of POLA-PU were between 96 and 153 ℃ by thermomechanical analysis (TMA) and the restoration time was less than 20 s in 140 ℃. When the deformations from the permanent to the temporary shape were up to 200%, POLA-PU samples had a shape fixity rate between 65% and 100% and a shape recovery rate of 100%. Shape memory behavior relies on the cross-linking densities, and this effect can be achieved with changing conformational entropy of soft chains in different temperatures. The degradation of POLA-PU was investigated in 10% NaOH at 80 ℃. The results showed that the PLLA segments were introduced to novel shape memory materials with the degradable property, and the rate of degradation was decreased with decreasing the PLLA segments content.

Key words: polyether, polylactide, polyurethane, shape memory, degradation