摘要
用热激放电电流（ＴＳＤＣ）技术研究了具有微相分离结构的聚乙二醇型多嵌段聚醚氨酯脲（ＰＥＵＵ）的弛豫行为．通过浇铸ＰＥＵＵ的Ｎ，Ｎ－二甲基乙酰胺溶液所得的ＰＥＵＵ薄膜，其ＴＳＤＣ谱显示４个峰（α，β，γ和ρ），发现这些峰与软段的分子运动即氧亚乙基序列的局部运动（γ峰）、微布朗运动引起的玻璃化转变（β峰）、Ｍａｘｗｅｌｌ－Ｗａｇｎｅｒ－Ｓｉｌｌａｒｓ界面极化（α峰）以及各种带电离子的迁移（ρ峰）密切相关，这些实验结果已经证明，ＴＳＤＣ分析是研究高分子固态离子导体的一种有价值的工具．
Relaxation behavior of poly (ethylene glycol)-type segmented polyether polyurethaneureas(PEUU),which have microphase separated structure formed by hard and soft segments ,was studied by thermally stim-ulated discharge current(TSDC)technique.TSDC spectra of the PEUU films obtained by casting a N,N-dimethylacetamide(DMA solution of PEUU showed four peaks(α,β,γ,and ρ).These peaks are found to beclosely related to molecular motion of the soft segment,namely, local motion of oxyethylene sequence(γpeak),glass transition caused by micro-Brownian motion(β peak),and Maxwell-Wagner-Sillars interfacialpolarization(α peak ),and transport of charged ionic species(ρ peak).These experimental results demonstrat-ed that the TSDC analysis is a valuable tool for studying polymeric solid-state ionic conductors.
出处
《科技通报》
1995年第1期7-10,共4页
Bulletin of Science and Technology
基金
江苏省自然科学基金
关键词
聚氨酯脲
热激放电电流
分子运动
聚乙二醇
polyurethaneurea
thermally stimulated discharge current
molecular motion
