二胺扩链剂对RIM聚氨酯－脲弹性体的结构与性能的影响  

THE EFFECT OF DIAMINE CHAIN EXTENDER ON STRUCTURE AND PROPERTIES OF SEGMENTED POLYURETHANE-UREAS BY RIM

作　　者：杲云[1] 修玉英[1] 潘肇琪[1] 王得宁[1] 胡春圃[1] 应圣康[1] 

机构地区：[1]华东理工大学材料科学研究所

出　　处：《高分子学报》1995年第6期685-692,共8页Acta Polymerica Sinica

基　　金：国家自然科学基金

摘　　要：采用实验室小型ＲＩＭ机制备了一组不同芳香二胺扩链的嵌段聚氨酯－脲（ＰＵＵ）弹性体，借助于ＩＲ、ＤＳＣ、ＤＭＴＡ、ＳＥＭ以及拉伸试验等测试手段对其结构与性能进行了研究．通过比较由ＭＤＡ、ＤＥＴＤＡ以及ＣＡＭＤＡ三种不同活性和结构的芳香二胺扩链剂与二异氰酸酯反应形成的硬链段对ＲＩＭＰＵＵ弹性体的结构与性能的影响，表明：ＭＤＡ基ＲＩＭＰＵＵ中软、硬链段微区界面作用指数很小，微相分离程度却很大，其性能最差；ＤＥＴＤＡ基ＲＩＭＰＵＵ弹性体有理想的界面作用指数，以及适当的微相分离程度，其性能位于三者之中最佳．ＤＭＴＡ研究证实在一定的温度范围内ＤＥＴＤＡ基ＲＩＭＰＵＵ的模量稳定性最好．A series of segment polyurethane-ureas from different kind of aromahc diamine chain extenders were prepared by laboratory-scale RIM machine. IR, DSC, DMTA, SEM have been used in comparing with tensile testing results to study the stmcture and properties of PUU. The influences of hard segments consisting of disocyanate and one of the three extenders (MDA, DETDA and CAMDA) on structure and properties of RIM PUU elastomers showed that the interface force index of soft-hard segment domain for the MDA-based material was smaller and its degree of phase Separation was greater than that based on either DETDA or CAMDA, while the DETDA-based one had ideal interface force index and adequate degree of phase separahon resulting in its best properties among the three. Moreover, the RIM material batal on DETDA had less dependence of modulus on temperature compared with materials based on ether MDA or CAMDA.

关 键 词：反应注射成型 聚氨酯 脲 PUU 二胺扩链剂 

分 类 号：TQ334.9[化学工程—橡胶工业] O631.11[理学—高分子化学]