GAP/HTPB共混粘合剂体系的力学性能研究

利用端羟基聚丁二烯(HTPB)粘合剂和端羟基叠氮聚醚(GAP)共混,以改善纯GAP粘合剂的力学性能;探讨各种固化反应条件对共混粘合剂力学性能的影响;静态拉伸测试结果显示共混胶片的确产生了协同效应,GAP与HTPB质量比11时,常温下粘合剂拉伸强度可达到3.833MPa,最大延伸率可达593%。动态热机械测试(DMA)结果显示,通过调整固化工艺条件,能够使得GAP与HTPB本不相容的两相产生反应增容,损耗因子-温度(Tanδ-T)曲线在-60.2℃附近出现单一的玻璃化温度;SEM照片更从微观形态上印证了以上两点。结果显示,HTPB与GAP共混粘合剂体系具有良好的力学性能,对GAP在复合固体推进剂中的应用具有一定的参考价值。

Mechanical Properties of GAP/HTPB Blend Binders

Glycidyl azido polymer (GAP) was modified with hydroxy terminated polybutadiene (HTPB) to improve the mechanical properties of GAP. Effects of different reaction conditions on mechanical properties of blend binders were discussed. Static tensile test results show synergy effect on mechanical properties of blend binders, and tensile strength and maximum elongation could reach 3.833 MPa and 593% while weight ratio of GAP and HTPB is 1:1. Tanδ-T curve from dynamic thermomechanical analysis shows single glass transition temperature near -60.2 ℃, implying that reactive compatibilization of immiscible GAP/HTPB blend binders could be got by controlling the curing reaction conditions. Micromorphology of GAP/HTPB blend binders displayed in SEM photos formed corroborating with the former two conclusions. In a word,HTPB/GAP blend binders with excellent mechanical properties possessed a good prospect for applications of GAP in composite solid propellents.