浇注PBX固化行为的实验与模拟

Experimental and Simulation Study on Curing Process of Cast PBX

采用动态流变学实验对浇注高聚物黏结炸药(PBX)固化过程的宏观性质表现进行了测试。结果表明,PBX的储能模量(G′)和损耗模量(G″)随固化时间逐渐增大,且G′逐渐接近并超过G″,二者最终趋于稳定。通过分子动力学方法模拟了PBX黏结剂端羟基聚丁二烯(HTPB)与交联剂甲苯二异氰酸酯(TDI)之间固化反应的微观过程,并对体系固化各阶段的力学性能进行了计算。模拟结果与流变实验结果之间具有较高的一致性,说明分子动力学模拟可为PBX的固化行为研究提供微观信息。

The curing process of the polymer bonded explosive （PBX） was investigated by means of the dynamic theology method. Results show that the storage modulus（G′） and loss modulus （G＂） increased significantly, G′ and G＂ increased to the maximum and level off, and then G′ was higher than G＂ . The micro process of curing between HTPB and TDI was simulated by using molecular dynamics simulation, and the mechanical properties of HTPB/TDI blend in different curing stage were calculated. The above simulation has a good accordance with the experimental result, it showed that molecular dynamics simulation can serve as a micro study tool for the curing process of PBX.