具有相分离结构的PMMA/PEG半互穿网络形状记忆高分子  

PMMA/PEG Semi-interpenetrating Network Shape Memory Polymer with Phase Separation Structure

作　　者：李兴建 白宝仕 刘升 苗玉杰 郑朝晖[2] 丁小斌[2] LI Xingjian;BAI Baoshi;LIU Sheng;MIAO Yujie;ZHENG Zhaohui;DING Xiaobin(School of Materials Science and Engineering,Linyi University,Linyi 276000,China;Chengdu Institute of Organic Chemistry,Chinese Academy of Sciences,Chengdu 610041,China)

机构地区：[1]临沂大学材料科学与工程学院,临沂276000 [2]中国科学院成都有机化学研究所,成都610041

出　　处：《材料导报》2020年第2期2142-2146,共5页Materials Reports

基　　金：国家自然科学基金(51173185;51303179);中国博士后科学基金(2017M611977)~~

摘　　要：采用一步法,将不同分子量的线型聚乙二醇(PEG)与甲基丙烯酸甲酯(MMA)单体和交联剂原位聚合,制备了具有相分离结构的聚甲基丙烯酸甲酯/聚乙二醇半互穿聚合物网络(PMMA/PEG semi-IPNs)形状记忆高分子。采用差示扫描量热分析(DSC)、动态热力学分析(DMA)和应力-应变分析,对具有不同分子量PEG的PMMA/PEG semi-IPNs形状记忆高分子的热性能、动态力学性能和力学性能进行了表征,同时采用DMA对其双形形状记忆效应和三形形状记忆效应进行了研究。结果表明,PMMA/PEG semi-IPNs形状记忆高分子同时具有PEG的结晶相和复合网络的无定形相区,由于PEG结晶熔融温度处于复合网络的玻璃化转变温度区,能够辅助增强复合材料的形状记忆性能,其固定率和回复率都可达99%以上,而且利用这两个热转变作为形状记忆的开关相可以实现PMMA/PEG semi-IPNs优异的三形形状记忆功能,并对其三形形状记忆效应机理进行了阐释。In this work,in-situ polymerization of linear polyethylene glycol(PEG)with different molecular weights,methacrylate(MMA)monomers and crosslinking agent was carried out by a one-step approach,in order to prepare the shape memory polymer of poly(methyl methacrylate)/polyethylene glycol semi-interpenetrating networks(PMMA/PEG semi-IPNs)with phase separation structure.The thermal properties,dynamic mechanical properties and mechanical properties of PMMA/PEG semi-IPNs shape memory polymers with diverse molecular weights of PEG were investigated by differential scanning calorimetry(DSC),dynamic mechanical analysis(DMA)and stress-strain analysis.Furthermore,DMA was also employed to study the double shape memory effect and triple shape memory effect of the PMMA/PEG semi-IPNs.It was found that the PMMA/PEG semi-IPNs shape memory polymer showed both crystal phase of PEG and amorphous phase region of the composite network.Thanks to the melting temperature of PEG crystal that located in the glass transition temperature zone,the shape memory performance of the semi-IPNs could be synergistically enhanced,and both the fixed rate and the recovery rate of semi-IPNs exceeded 99%.Accordingly,exceptional triple shape memory effect can be achieved by taking these two thermal transitions as the switching phase of shape memory.Additionally,the mechanism of triple shape memory effect of PMMA/PEG semi-IPNs was expounded.

关 键 词：形状记忆高分子 相分离 半互穿聚合物网络 三形形状记忆效应 

分 类 号：TB381[一般工业技术—材料科学与工程]