不同软段结构对聚脲基氨酯扩链反应动力学的影响研究EI

用ＦＴ－ＩＲ法系统地研究了３种不同软段结构ＴＤＩ封端预聚物对聚脲基氨酯扩链反应动力学的影响。结果显示，不同软段结构的预聚体与ＭＯＣＡ的扩链反应均为二级反应，软段为ＰＣＬ的预聚体其扩链反应速率大大快于软段为ＰＥＰＡ或ＰＴＭＯ的预聚体，聚酯型软段结构（ＰＣＬ或ＰＥＰＡ）的预聚体其扩链反应活化能大大低于聚醚型（ＰＴＭＯ）预聚体，同时对上述结果的产生原因从理论上进行了讨论。

STUDY ON POLYUREA URETHANES OF VARIOUS SOFT SEGMENTAL STRUCTURE CURING REACTION KINETICS

It was systematically studied that the different soft segments had a effect on chain extension reaction kinetic of polyurethane by FT IR method in this paper. The experimental results indicate that the chain extension reactions of NCO terminated prepolymers of various soft segments with MOCA are second order reactions. The chain extension reaction rate of the NCO terminated PCL soft segment prepolymer is faster than that of PEPA or PTMO soft segment prepolymer. The chain extension reaction activation energy of polyether soft segment(PTMO) prepolymer is higher than that of polyester as soft segment(PCL or PEPA) prepolymer. Meanwhile, the cause of these results obtained were detailedly discussed in this paper.