PLLA基形状记忆复合材料的制备及协同形状记忆机理研究

项目名称： PLLA基形状记忆复合材料的制备及协同形状记忆机理研究

项目编号： No.51303085

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 张伟

作者单位： 南通大学

项目金额： 25万元

中文摘要： 申请者前期采用熔融共混方法制备出PLLA/PAE复合材料，该材料克服了纯PLLA脆性大的缺陷，显示出优良的韧性，拉伸断裂伸长率提高40倍左右，并且显示出优良的形状记忆能力，形状回复率高达90%以上。而且与传统的形状记忆聚合物不同的是，其实施方法更为简单且易于实施。传统形状记忆聚合物完成一次形状回复循环需要4步，而该材料在冷拉条件下实施仅需2步即可，并且力学保持性良好。在此基础上，本项目将继续深入研究该体系中PLLA分子量、结晶度、PAE弹性体的嵌段结构（软硬段比例）、两相相容性、界面粘结以及加工工艺等因素对增韧效果和形状记忆能力的影响，系统研究复合材料结构与性能之间的相互关系及控制方法。同时，探索PAE弹性体与PLLA的协同形状记忆机理。相信，通过不断的探索和积累基于PLLA增韧改性及形状记忆方面的研究，将对PLLA及其复合材料的应用具有革新性的变化，并对形状记忆材料的发展具有重要的意义。

中文关键词： 聚乳酸；聚酰胺弹性体；聚己内酯；增韧；形状记忆

英文摘要： The applicant prepared PLLA/PAE composite materials by melt blending earlier. The materials overcome the brittleness defect of pure PLLA, and showed good toughness, which tensile elongation at break improved about 40 times. It showed good shape memory ability, and shape recovery rate was above 90%. The materials were different to traditional shape memory polymers, its implementation method is more simple and easy to implement. Traditional shape memory polymers completing a shape cycle need 4 steps, and the materials in cold conditions need only 2 steps, and its mechanical properties remain well. On this basis, the project will continue to further research the effect of PLLA molecular weight, crystallinity, block structure of PAE elastomer (soft and hard section ratio), phase compatibility, interface bonding and processing technology factors on toughening and shape memory ability, and study on the relationship between composite structure and performance and control method systematically. At the same time, cooperative shape memory mechanism of PLLA and PAE elastomer will be discussed. We believe that through the continuous research on PLLA toughening modification and shape memory effect will change the application of PLLA composite materials, and improve development of shape memory materials significantly.

英文关键词： poly (lactic acid)；polyamide elastomer；polycaprolactone；toughening；shape memory