【摘要】 采用动态扭振法研究HTPB/TDI体系的固化过程,获得体系在80,90,100,110℃下时扭矩随固化时间变化关系,发现HTPB/TDI的固化过程分为3个阶段:第1个阶段为液态到凝胶点阶段;第2阶段为凝胶点到高弹态阶段;第3阶段为硬化点到固化终点阶段.根据Flory凝胶化理论计算得到HTPB/TDI体系在TPB催化时固化反应活化能为1.58kJ/mol,与傅里叶变温红外法根据Arrhenius公式求得的41.98kJ/mol基本一致.通过ATR漫反射红外对HTPB/TDI胶片进行氢键分析,证实的确发生动态扭振法所得到的固化第3阶段.更多还原

【Abstract】 A dynamic torsional vibration method was applied to on-line monitor the curing behaviour of hydroxyl-terminated polybutadiene/toluene diisocyanate(HTPB/TDI)system at different temperature.According to the diagram of torque change with time,the curing process was divided into three phases:the first phase was the period from liquid stage to the gel point;the second phase was the period from the gel point to the hardening point;the third phase was the period from the hardening point to the curing end-point.During the third stage the internal chemical cross-linking basically completed while the physical cross-linking point still forming.Therefore,the value of torque was growing slowly till the curing end-point.According to the Flory gelation theory,the calculatedΔEaof HTPB/TDI system is 41.58 kJ/mol,almost the same result calculated with the FT-IR method.FT-TR method can only reflect the first and the second period of the curing process.And the dynamic torsional vibration method can monitor fullrange of the curing process.The infrared diffuse reflectance spectroscopy of HTPB/TDI system validates the dynamic torsional vibration method.更多还原