Studies on microdomain structure in segmented polyether polyurethaneureas by positron annihilation lifetime and small-angle X-ray scattering  

作　　者：YinChuan－Yuan GuQing－Chao 等 

机构地区：[1]DepartmentofPhysics,NanjiangUniversity,Nanjing210093 [2]DepartmentofPolymerScienceandEngineering,Nanjing

出　　处：《Nuclear Science and Techniques》1997年第4期221-224,共4页核技术（英文）

摘　　要：ＳｔｕｄｉｅｓｏｎｍｉｃｒｏｄｏｍａｉｎｓｔｒｕｃｔｕｒｅｉｎｓｅｇｍｅｎｔｅｄｐｏｌｙｅｔｈｅｒｐｏｌｙｕｒｅｔｈａｎｅｕｒｅａｓｂｙｐｏｓｉｔｒｏｎａｎｎｉｈｉｌａｔｉｏｎｌｉｆｅｔｉｍｅａｎｄｓｍａｌａｎｇｌｅＸｒａｙｓｃａｔｅｒｉｎｇ?..The microdomain structure of segmented polyether polyurethaneureas is investigated by means of positron annihilation lifetime spectroscopy, small angle X ray scattering and differential scanning calorimetry. The experimental results show that the decrease in the domain volume and free volume results from the increase in the hard segment (polyurethaneurea segment) contents as the number average molecular weight M n of the soft segments (polyethylene glycol segments)is the same, and that the increase in domain volume and free volume result from the increase in the M n of the soft segments when the hard segment content is the same or nearly the same. These results demonstrate that positron annihilation lifetime spectroscopy is a sensitive technique to probe the microdomain structure in polymers.

关 键 词：聚醚聚氨酯-脲 微观区结构 X射线散射 

分 类 号：TQ326.5[化学工程—合成树脂塑料工业]