【摘要】 <正> 不少研究者用介电驰豫的方法对聚合物进行了广泛的研究.对多嵌段的两相体系,介电驰豫的方法很灵敏.我们曾用此法研究了不同扩链剂及软段为聚四亚甲基醚二醇(PTMG)嵌段聚醚氨酯(SPEU)的分子运动,观察到软段结晶的α_c峰.本文用介电驰豫方法进一步考察软段链结构不同对温度谱的影响,以及不同驰豫单元的活化能.更多还原

【Abstract】 In this paper, the dielectric spectra of different chain structure of segmented poly(ether-urethane ) copolymer have been investigated. All relaxation phenomena were greatly influenced by the molecular weight of the prepolymer. Conditions of the micro-phase separation have been discussed. The apparent activation energies of relaxation processes were determined.更多还原