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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 block polyurethane-urea (PUU) elastomers with different aromatic diamines were prepared by a laboratory small RIM machine. Their structures and properties were tested by means of IR, DSC, DMTA, SEM and tensile test Study. By comparing MDA, DETDA and CAMDA three different activities and structures of aromatic diamine chain extender and diisocyanate reaction of the formation of hard segment on the structure and properties of RIMPUU elastomer showed that: MDA-based RIMPUU soft, hard chain The function index of segment micro-zone interface is very small, the degree of micro-phase separation is very large, and its performance is the worst. DETDA-based RIMPUU elastomer has ideal interface effect index and appropriate degree of micro-phase separation, and its performance lies in the three good. DMTA studies confirm that the DETDA-based RIMPUU has the best modulus stability over a range of temperatures.