液晶型聚氨酯弹性体的固体高分辨核磁共振研究  

Solid-State High-Resolution ￣(13)C NMR Study on Main-Chain Liquid Crystalline Polyurethane Elastomer

作　　者：陈群[1] 杨光[1] 余学海[1] 王源身[1] 黑子弘道 安藤勋 

机构地区：[1]华东师范大学分析测试中心,南京大学化学系高分子专业,日本东京工业大学高分子工学科

出　　处：《功能高分子学报》1995年第4期400-408,共9页Journal of Functional Polymers

基　　金：国家教委留学归国人员科研资助

摘　　要：采用固体高分辨１３Ｃ核磁共振谱以及溶液碳谱、氢谱的方法对以聚四氢呋喃（ＰＴＭＯ）为软段、４，４’－二苯基甲烷二异氰酸酯（ＭＤＩ）为硬段、４，４’－二羟已氧基联苯（ＨＢ６）为扩链剂的液晶型聚氨酯弹性体的相态结构、分子运动、氢键相互作用等问题进行了研究。探讨了样品的化学结构与上述问题间的关系。he 13C CP/MAS,PST/MAS and DD/MAS NMR experiments were carried out on a mainchain liquid-crystalline polyurethane elastomer based on poly(tetramethylene oxid)(PTMO),4,4'-diphenylmethane diisocyanate(MDI)and 4,4'-bishydroxyhexyloxybiphenyl(HB6).The HB6 segment which serves as chain extender in the sample was found to be well crystallized,whereas the hard segment MDI was not because of the great content of graft structure in the MDI segment(Scheme2).The mobility of MDI segment was found to be higher than that of the HB6 segment in both MHz and low frequency regions.Two carbonyl peaks were observed in the 13C CP/MAS spectrum and were assigned to hydrogen-bonded and free carbonyl groups.The relative content of free carbonyl groups is higher than that of the hydrogen-bonded ones.A small peak at about 64.80 ppm in both 13C high-resolution spectrum in DMF-d7 and 13C CP/MAS spectrum is assigned to the methylene carbon that locates at the chain end of the PTMO soft segment.

关 键 词：液晶型 聚氨酯弹性体 核磁共振 

分 类 号：TQ334.1[化学工程—橡胶工业] O641.133[理学—物理化学]