丁腈橡胶类键合剂在CL-20/GAP体系中的应用

Application of Nitrile Butadiene Rubber Bonding Agents in CL-20/GAP System

为改善CL-20/GAP体系的界面性能,提高推进剂的力学性能,将液体丁腈橡胶、增塑液体丁腈橡胶及端羟基液体丁腈橡胶作为键合剂分别加入到推进剂中;采用扫描电镜(SEM)观察了键合剂对CL-20的包覆效果;通过材料拉伸机测试了20℃下键合剂对GAP胶片力学性能的影响,并在-40、20和70℃下测试了键合剂对CL-20/GAP推进剂力学性能的影响;通过动态热机械分析仪(DMA)测试了推进剂的力学损耗因子tgδ,分析了键合剂对体系界面的影响。结果表明,CL-20被完全包裹在键合剂中; 20℃下,加入3种键合剂的胶片在拉伸强度基本不变的情况下,断裂延伸率由原来的139. 0%分别增至150. 7%、147. 0%和152. 3%,起到了扩链剂的作用;端羟基液体丁腈橡胶的加入有效提高了推进剂的伸长率,-40、20和70℃下的最大伸长率由22. 1%、44. 8%和52. 7%分别增至58.1%、64. 9%和80. 2%;推进剂在-40℃下的黏附指数由1. 67降至1. 15,变化趋势与tgδ曲线相符,说明该类键合剂的加入能有效抑制CL-20/GAP体系的界面"脱湿"。

To ameliorate the interfacial properties of CL-20/GAP system and improve the mechanical properties of propellants,liquid nitrile butadiene rubber,plasticized liquid nitrile butadiene rubber and hydroxyl-terminated liquid nitrile butadiene rubber were added separately to propellants as bonding agents.The coating effect of bonding agents on CL-20 was observed by scanning electron microscope(SEM).The effect of bonding agents on mechanical properties of GAP films was tested by material stretching machine at 20℃,and the effect of bonding agents on mechanical properties of CL-20/GAP propellant was tested at -40,20 and 70℃.The mechanical loss factor tgδ of propellants was measured by thermal dynamic mechanical analysis(DMA).The effect of bonding agents on the interface of the system was analyzed.The results show that CL-20was completely coated in the bonding agent.The elongation at break of the films of adding three kinds of bonding agents increases from 139.0% to 150.7%,147.0% and 152.3%,respectively in the basically unchanged cause of tensile strength,which plays a role as chain extenders.The addition of hydroxyl-terminated liquid nitrile butadiene rubber can effectively increase the elongation of propellants,the maximum elongation of propellants at -40,20 and 70℃ increases from 22.1%、44.8% and 52.7% to 58.1%、64.9% and 80.2%,respectively.The adhesion index of propellants at -40℃ decreases from 1.67 to 1.15,and the change trend is consistent with the curve of tgδ,indicating that the addition of this kind of bonding agent can effectively inhibit the dehumidification of CL-20/GAP interface.