【摘要】 为了改善环氧树脂的韧性 ,以甲苯二异氰酸酯和聚氧化丙烯二元醇为原料 ,合成了端羟基聚氨酯预聚体 .该预聚体同环氧氯丙烷进行开环加成反应 ,得到中间体氯化聚醚二元醇 ,再经乙二胺胺解后 ,制得了氨酯基改性的端胺基聚醚型柔性固化剂 ,产物通过红外光谱和端基分析进行了表征 .在室温下研究了固化剂与环氧树脂胶片的力学性能 .以联二脲为填料 ,胶片在 2 0℃、5 0℃及 - 4 0℃下的拉伸强度和延伸率分别为 6 4 4MPa和 12 4 15 %、2 68MPa和 85 2 4 %、2 7 3 8MPa和 2 4 0 9% .玻璃化转变温度表明加入该固化剂后体系的柔性得到了增加 ,断面形貌呈现出明显的韧性断裂行为更多还原

【Abstract】 The polyurethane modified flexible curing agent is prepared by reacted epichlorohydrin with hydroxylterminated polyurethane oligomer, which is synthesized from toluene2, 4diisocyanate (TDI) and polyoxypropylene glycol (PPG). The resulting chlorinated polyether is then aminated by the reaction therewith of excess ethylene diamine and the product is characterized by infrared spectroscopy spectrum and end group analysis. The mechanical properties of the composite by using biurea as filler are studied. The tensile strength and elongation of the composite at different temperature are as follows respectively: 6 44 MPa and 124 15%(20 centigrade), 2 68 MPa and 85 24%(50 centigrade), 27 38 MPa and 24 09%(40 degree of frost). The glass transition temperature and the morphology of the fracture surface are also discussed.更多还原