水合聚氨酯脲的力学性能、组成及氢键结构变化的研究  

THE CHANGE IN MECHANICAL PROPERTIES AND STRUCTURE OF THE HYDRATED POLYURETHANEUREA

作　　者：武利民[1] 游波[1] 李丹[1] 钱峰[1] 

机构地区：[1]复旦大学材料科学系,上海200433

出　　处：《高分子材料科学与工程》2001年第4期157-159,162,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金 (5 98730 0 4);教育部留学回国人员基金资助课题

摘　　要：研究了在聚氨酯脲盐溶液中 (0 .9% (质量 ) Na Cl,37℃ )浸泡不同时间后的静态和动态力学性能、组成、氢键结构的变化规律。结果表明 ,盐溶液浸泡可使平均分子量和相分离程度大大增加 ,并可提高力学强度和减少柔顺性 ,而平均分子量的增加是由于发生了分子间或分子内扩链或交联以及 PTMO低聚物的逸出。FT-The polyurethaneureas were immersed in saline solution( 0.9 mass% NaCl, 37 ℃) for periods of up to 60 d and evaluated by the change in static and dynamic mechanical properties, composition, and hydrogen bonding structure and surface morphology. Immersion in saline solution can greatly increase the average molecular weight and degree of phase separation, which enhance the mechanical strength and reduce the flexibility. This increase in average molecular weight is believed to come from the chain extension or crosslinking between intramolecules or intermolecules, and the leaching out of PTMO oligomers. FT IR analysis indicates that H 2O molecules can not obviously change the hydrogen bonding structure of polyurethaneurea.

关 键 词：聚氨酯 水合聚氨酯脲 分子量 力学性能 氢键 结构 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]