RDX含量对改性双基推进剂动态力学性能的影响

Effect of RDX content on dynamic mechanical properties of modified double-base propellants

利用动态热机械分析研究了一组不同RDX含量的改性双基推进剂的动态力学性能。根据"时间-温度"等效原理的WLF方程获得了该推进剂体系α松弛的粘弹系数Cg1,Cg2和主曲线叠合的垂直位移因子bT以及松弛过程的活化能Ea。结果表明,随着固体填料(RDX)含量的增加,该推进剂的储能模量下降,α松弛的损耗角正切(tanδ)的峰温逐渐降低,以tanδ为代表的力学损耗强度逐渐增大,而β转变所对应的温度不变。用自由体积理论解释了固体含量对改性双基推进剂动态力学性能的影响。

The dynamic mechanical properties of a series of modified double-base propellants with various amounts of RDX were characterized by using dynamic mechanical analyzer. The viscoelastic coefficients C^g1, C^g2, vertical shift factor br obtained from master curves superposition, and the activation energy Eα on the α-relaxation transition of the propellants were calculated according to the “time-temperature” equivalence principle. It is shown that with the increase of solid filler（RDX） , the storage modulus decrease, the peak temperature of the α-relaxation becomes lower,the magnitudes of the α-relaxation increase gradually and the peak temperature of the β-relaxation is unaffected. The influence of solid contents on dynamic me- chanical properties of modified double-base propellant was explained by the free volume theory.