【摘要】 聚氨酯弹性体(PUE)的合成工艺、组成对它的分子结构、规整性和微相分离程度产生直接的影响,进而影响其性能。本文用控制预聚体反应中单体的摩尔比、减压共沸蒸馏去除预聚体中游离甲苯二异氰酸酯(TDI)、两步法加扩链剂EG的方法合成了聚醚(PPG)聚氨酯材料。结果表明:1.采用预聚体工艺并且分步加入乙二醇(EG)所制备的聚氨酯弹性体具有较好的力学性能,玻璃化温度向高温方向偏移了6℃;2.采用减压共沸蒸馏工艺制备的聚氨酯材料在低温区的tanδ峰消失。更多还原

【Abstract】 The ordered and micro-phase structures of PU molecular depend directly on its synthesis technology and composition.The general studies on PU was carried out by the methods of controlling the prepolymerization technology,taking off dissociative TDI from prepolymer through decompress co-boiling distilling technology.The results showed that the mechanical properties of PU prepared by added EG in a two-step process in prepolymerization technology were better than that of one-step process,its T_g shifted 6℃ towards high temperatures;the tanδ peak of PU material at low temperature disappeared through decompress co-boiling distilling technology.更多还原