关键词: 改性双基推进剂;动态热机械分析+;动态力学性能;脆化参数+

Abstract: The dynamic mechanical properties of a series of modified double-base propellants with various amounts of RDX at low temperature were characterized by using dynamic mechanical analyzer.The peak temperature of the β-relaxation was not affected by adding solid filler.It is considered that when the RDX content exceeds some certain percent it would appear an effect as auxiliary plasticizer and the relation of the peak magnitudes for tan δ on the β-relaxation with the equivalent plasticizer was obtained.Thus through the regression relation the equivalent plasticizer concentration could be calculated.The viscoelastic coefficients Cg1,Cg2 and the activation energy Ea on the β-relaxation transition(the molecular configuration conversion) from the master curves of propellants,and the fragility parameters m were obtained.A linear equation was used to relate fragility parameter m with the tensile strength σm and the percentage elongation εm at low temperature.

Key words: Modified doublebase propellant;Dynamic mechanical analyzer(DMA)+;Performance of dynamic mechanics;Fragility parameter+