丁羟推进剂固化体系中活泼氢组分的反应活性研究

分别对端羟基聚丁二烯(HTPB)/苯异氰酸酯(PI),键合剂(BA-5)/PI和防老剂H(N,N′—二苯基对苯二胺)/PI在甲苯/二甲基亚砜混合溶液体系中进行了反应动力学研究,计算了相应体系的反应速率和活化能。结果表明,在相同的条件下,这三种体系中活泼氢组分的反应速率由大到小依次为:键合剂(BA-5)上的胺基、HTPB,BA-5上的羟基、防老剂H上的胺基。对上述活泼氢组分构成的四个不同配方用TD I固化并制成胶片,对固化时间不同的胶片进行了单向拉伸和溶胀比测试;力学性能和交联密度变化的结果验证了动力学结果,同时也表明BA-5和防老剂H都能有效提高丁羟推进剂的力学性能。

A study for reactive activity of active hydrogen components in curing system of HTPB propellant

Kinetics of hydroxyl-terminated polybutadiene(HTPB)/ phenyl isocyanate(PI),bonding agent(BA-5)/PI and antioxidant H/PI were studied in toluene/dimethyl sulphoxide solution.The rate constants and the activation parameters were calculated.The results show that the reactionary rate of these three active hydrogen components decreased in same condition.The sequence is in following order: amine of BA-5>HTPB>hydroxyl of BA-5>antioxidant H. Then four different formulations composed of these active hydrogen agents were cured with TDI and were made into rubber sheets.The effects of active hydrogen components on curing process were investigated by measurement of uniaxial tensile properties and swell ratio.Variety of rubber sheets mechanical properties and crosslink density were confirmed with the results of kinetics.The results also show that both BA-5 and antioxidant H can improve HTPB propellant mechanical properties effectively.