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研究了细粒度 AP及工艺助剂 PA含量对丁羟高燃速推进剂低温 (-4 0℃ )力学性能的影响 ,结果显示 :大量细粒度AP加入高燃速配方中 ,一方面加剧了单向拉伸过程中填料 (主要是细 AP)颗粒附近的应力集中 ;另一方面降低了填料 /粘合剂间的粘结强度 ,是造成低温力学性能偏低的主要原因。由于工艺助剂 PA极性及刚性 ,使得它易于富集于填料表面 ,低温下降低了界面层的柔性 ,物理作用也极大地束缚了填料附近粘合剂网络的分子运动 ,因此 ,它在改善工艺性能的同时 ,对推进剂低温力学性能有不利影响。
The effects of fine-grained AP and PA content on the mechanical properties of low-temperature high-butane-butadiene (HDB) propellants at -400 ℃ were studied. The results showed that a large amount of fine-grained APs were added to the high-burning-rate formulations, The stress concentration near the particles (mainly fine AP) during the stretching process is reduced. On the other hand, the bonding strength between the filler and the binder is reduced, which is the main reason for the low mechanical properties at low temperature. Because of the polarity and rigidity of process aid PA, it is easy to accumulate on the surface of the filler and lowers the flexibility of the interface layer at low temperature. The physical action also greatly hinders the molecular movement of the binder network in the vicinity of the filler. Therefore, At the same time, the mechanical properties of propellants are adversely affected.