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本文研究了固化剂和防老剂对 CTPB 推进剂加速老化的影响。如果使用的固化剂在羧基当量以上,那么推进剂中过量的固化剂就起着填料的键合剂的作用,但其反应速度远远慢于粘合剂的固化速度。苯二胺类化合物(CTPB 粘合剂的稳定剂)不仅降低交联速度,而且也降低交联密度。推进剂中的少量水分,按一级反应使填料与粘合剂间的交联断裂,进而使聚合物解聚。CTPB 推进剂的交联密度约为1×10~(-3)克分子/(厘米)~3,比粘合剂的交联密度高一个数量级。
This article studies the effect of curing agents and antioxidants on the accelerated aging of CTPB propellants. If the curing agent used is above the carboxy equivalent, the excess curing agent in the propellant acts as a filler bonding agent but at a much slower rate than the curing rate of the binder. Phenylenediamines (stabilizers for CTPB adhesives) not only reduce the crosslinking speed, but also reduce the crosslinking density. A small amount of water in the propellant breaks down the cross-linking between the filler and the binder according to a first order reaction, thereby depolymerizing the polymer. Cross-linked density of CTPB propellant is about 1 × 10 -3 mol / cm -3, which is an order of magnitude higher than that of the adhesive.