TPB对HTPB—TDI固化反应的影响

采用非等温示差扫描量热法（DSC）研究了三苯基铋（TPB）对HTPB—TDI体系固化反应动力学的影响。测定了其固化峰温，以Kissinger法和Crane法计算其活化能等动力学参数，列出了固化反应动力学方程。结果表明，未加催化剂时活化能为51．29kJ／mol，加入TPB后活化能降至46．43kJ／mol。因此，TPB能有效地降低固化反应的活化能，加快反应速率，降低反应温度，缩短固化时间，并使固化体系在27℃时的反应速率达到未加催化剂时80℃的值，当催化剂浓度为0．5％时，催化活性达到最大。

Effect of TPB on curing reaction of HTPB-TDI

Catalysis effect of triphenyl bismuth （TPB） on kinetics of hydroxyl terminated polybutadiene-toluene diisocyanate （HTPB-TDI） curing reaction was studied by non-isothermal differential scanning calorimetry （DSC）. The characteristic temperature of curing system was measured for calculating kinetic parameters and establishing curing reaction kinetic equations. The results show that activation energy （Ea） of uncatalyzed HTPB-TDI curing system is 51.29 kJmol-1, and TPB decreases Ea to 46.43 kJ＇mol-1. Catalyst lowers reaction temperature and shortens curing time through decreasing ac- tivation energy of curing reaction and accelerating reaction rate. TPB can increase the reaction rate at 27 ℃ to the value of uncatalyzed system at 80 ℃. The catalytic activity reaches the maximum when concentration is 0.5 %.