支化结构对形状记忆聚甲基丙烯酸酯-星形聚乙二醇半互穿网络性能的影响  

Effect of Branched Structure on the Properties of Shape Memory Polymethacrylate/Star-Shaped Polyethylene Glycol Semi-Interpenetrating Networks

作　　者：李兴建 成俊杰 薛申奥 徐守芳 郑朝晖[2] 丁小斌[2] Xingjian Li;Junjie Cheng;Shen’ao Xue;Shoufeng Xu;Zhaohui Zheng;Xiaobin Ding(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,山东临沂276000 [2]中国科学院成都有机化学研究所,四川成都610041

出　　处：《高分子材料科学与工程》2021年第11期62-68,76,共8页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(21777065);山东省自然科学基金资助项目(ZR2020QE092,ZR2020KE002);山东省高等学校青年创新团队项目(2019KJA021);国家级大学生创新创业训练计划项目(202110452054)。

摘　　要：半互穿聚合物网络(semi-IPNs)是设计形状记忆聚合物的一种模型网络结构。为了探究semi-IPNs中非交联网络组分的结构形态对形状记忆高分子性能的影响,文中设计制备了形状记忆聚甲基丙烯酸甲酯/星形聚乙二醇半互穿网络聚合物(PMMA/SPEGsemi-IPNs),探究了SPEG分支长度对其力学强度、热性能、相分离程度、动态力学性能和形状记忆性能的影响,阐明了形状记忆PMMA/SPEGsemi-IPNs中SPEG的支化结构与形状记忆性能之间的关系。基于Edwards管道模型理论分析了SPEG支化结构对形状记忆PMMA/SPEGsemi-IPNs形状记忆性能的影响机制,采用蠕变测试对其理论分析进行了验证。研究结果表明,随着SPEG分支长度的增大,形状记忆PMMA/SPEGsemi-IPNs中的物理缠结作用增强,分子链松弛过程变慢,材料的玻璃化转变温度升高,模量增大,蠕变柔量增大,固定率降低,回复速度显著增大。Semi-interpenetrating polymer networks(semi-IPNs)are a model network structure for designing shape memory polymers.To explore the influence of the structural morphologies of the non-crosslinked network components in semi-IPNs on the properties of shape memory polymers,shape memory polymethyl methacrylate/star-shaped three-arm polyethylene glycol semi-interpenetrating network polymers(PMMA/SPEG semi-IPNs)were designed and prepared.The effect of SPEG branch length on mechanical strength,thermal properties,degree of phase separation,dynamic mechanical properties and shape memory properties of PMMA/SPEG semi-IPNs was explored,and the relationship between shape memory performance and branched structure of SPEG in PMMA/SPEG semi-IPNs was clarified.Based on the Edwards model theory,the influence mechanism of the branched structure of SPEG on the shape memory performance of shape memory PMMA/SPEG semi-IPNs was analyzed,and the theoretical analysis was verified by creep test.The results show that as the branch length of SPEG increases,the physical entanglement in shape memory PMMA/SPEG semi-IPNs increases,the relaxation process of molecular chains becomes slower,the glass transition temperature of the material increases,the modulus and creep compliance increase,the shape fixity ratio decreases,and the shape recovery rate increases significantly.

关 键 词：形状记忆高分子 半互穿网络 星形聚乙二醇 支化结构 

分 类 号：TQ317[化学工程—高聚物工业]