GAP推进剂粘接体系组分迁移动力学研究

Migration Kinetics of Ingredient in GAP Propellant and Its Bonding System

为研究组分在缩水甘油叠氮聚醚(GAP)推进剂/端羟基聚丁二烯(HT PB)衬层/三元乙丙(EPDM)绝热层粘接体系中的迁移,采用高效液相色谱(HPLC)测定了经过50,60℃和70℃加速老化后体系中的主要迁移组分,计算了迁移组分的表观扩散活化能和扩散系数。结果表明,老化过程中硝酸酯增塑剂硝化甘油(NG)、1,2,4-丁三醇三硝酸酯(BTTN)发生迁移,两者的表观扩散活化能均在43~121 kJ·mol^(-1),扩散系数在10^(-1)9~10^(-1)6m^2·s^(-1)内。体系中胺类安定剂1(AD1)、胺类安定剂2(AD2)的迁移发生在固化过程,老化过程中主要以消耗为主;GAP推进剂的力学性能与推进剂中AD1的含量有关,AD1含量低于40%时,试件力学性能急剧下降。

The migrating components in the interface of the bonded samples of glyc HydroyI-Terminated Polybutadiene （HTPB） based liner/Ethylene-Propylene-DieneM dyl azide polymer（GAP） based propellant/ schpolymere （EPDM） based insulation were determined by high performance liquid chromatography（HPLC） after aged at 50, 60 ℃ and 70℃. The apparent migration activa- tion energy（Ea） and the average diffusion coefficients （D） of the migrating components were determined. The results show that during aging nitrate ester plasticizers of nitroglycerine（NG） and 1,2,4-Butanetriol Trinitrate （BTTN） migrated from propellant to liner and insulation. The Ea values of NG and BTTN were among 43-121 kJ · mol-1 and their average diffusion coefficients were in the range of 10-19-10-16 m2 · s-1. The amine stabilizers of AD1 and AD2 were found to migrate during curing of the samples, while during storage, consumption of them was the main phenomenon. It could also be concluded that the content of AD1 had correlation with the mechanic property of the bonding system. When content of AD1 was less than 40%, the tensile strength of the samples decreased sharply.