摘要
测定了浇注高聚物粘结炸药(PBX)粘结剂固化反应的放热量,探讨了端羟基聚丁二烯(HTPB)分子量对固化反应速率的影响。采用非等温差示扫描量热法(DSC)研究了分子量分别为1500(M1)和2800(M2)的HTPB与2,4-甲苯二异氰酸酯(TDI)固化反应的动力学。结果表明,M1固化体系比M2固化体系的粘度增长迅速,固化放热量大。M1体系固化反应表观活化能约为55.87 kJ·mol-1,反应级数为0.88,指前因子为4.70×104s-1;M2体系的固化峰温升高,表观活化能、反应级数和指前因子分别提高至60.77 kJ·mol-1、0.89、1.07×105s-1,M1与M2体系反应机理函数仍遵循n级反应模型f(α)=(1-α)n,方程中的指数n有所变化。
Curing processes of hydroxyl-terminated polybutadiene（HTPB） with different molecular weight （M11500; M22800）/2,4-toluene diisocyanate （TDI） systems were studied by rotational viscometer and non-isothermal differential scanning calorimetry（DSC）, and effect of molecular weight on curing reation kinetic of system was investigated. Results show that the viscosity of M1 system increases faster than that of M2 system, and the curing reaction heat of M1 systems is greater than that of M2 system. The values of apparent activation energy, reaction order and pre-exponential factor of M1 system are 55.87 kJ·mol-1, 0.88,4.70×104 s-1, respectively. While for M2 system,the peak temperature of the curing process increases and the values of apparent activation energy,reaction order and pre-exponential factor increase to 60.77 kJ·mol-1, 0.89,1.07×105 s-1, respectively. The curing reaction mechanism of two curing system follows f（α）=（1-α）n and index n of M1 system curing reaction is only slightly different from that of M2 system.
出处
《含能材料》
EI
CAS
CSCD
北大核心
2013年第6期771-776,共6页
Chinese Journal of Energetic Materials
基金
国防973资助项目(51340030101)
关键词
高分子化学
端羟基聚丁二烯(HTPB)
非等温DSC
固化反应
动力学
polymer chemistry hydroxyl-terminated polybutadiene（HTPB） non-isothermal differential scanning calorimetry curing reaction curing kinetics
