摘要
采用非等温差示扫描量热法(DSC)研究了三苯基铋(TPB)与三-(乙氧基苯基)铋(TEPB)对端羟基聚丁二烯-2,4-甲苯二异氰酸酯(HTPB-TDI)体系固化反应动力学的影响。测定不同催化剂体系的固化峰温,采用Kissinger法和Crane法分别计算其动力学参数,得出了相应的固化反应动力学方程。结果表明,加入催化剂后,HTPB-TDI固化温度降低,固化温差缩短。未加催化剂时固化反应的活化能为51.29kJ·mol-1,加入TPB和TEPB后活化能分别为46.43kJ·mol-1和40.14kJ·mol-1,TPB与TEPB均能降低固化反应的活化能,增大反应速率,从而降低反应温度,缩短固化时间。TEPB能使固化体系在34℃时的反应速率常数达到使用TPB作为催化剂时50℃的值,因此TEPB催化活性更大,可以用作室温催化剂。
Effect of triphenyl bismuth（TPB）and tri（exhoxyphenyl）bismuthine（TEPB）on kinetics of hydroxyl terminated polybutadiene-toluene diisocyanate（HTPB-TDI）curing reaction were studied by non-isothermal differential scanning calorimetry（DSC）.Characteristic temperature of curing systems were measured for calculating kinetic parameters by Kissinger and Crane method and the curing reaction kinetic equations was established.Results show that catalysts decrease the curing temperature and shorten the curing temperature gradient.Activation energy（Ea）of uncatalyzed HTPB-TDI curing system is 51.29 kJ·mol^-1,the Eaof HTPB-TDI are decreased to46.43 kJ·mol^-1 and40.14 kJ·mol^-1 by using TPB and TEPB.Both catalysts lower reaction temperature and curing time through decreasing activation energy of curing reaction and accelerating reaction rate.The reaction rate constant value of HTPB-TDI catalyzed by TEPB at 34℃is similar to that of HTPB-TDI catalyzed by TPB at 50 ℃,indicating that the catalytic activity of TEPB is higher than that of TPB and it′s available for ambient catalyst.
出处
《含能材料》
EI
CAS
CSCD
北大核心
2015年第6期568-572,共5页
Chinese Journal of Energetic Materials
基金
山西省自然基金
