DNTF含量对改性双基推进剂动态力学性能的影响

采用动态力学分析(DMA)研究了不同含量3,4-二硝基呋咱基氧化呋咱(DNTF)对DNTF-CMDB(DF)推进剂动态力学性能的影响,获得了DF系列推进剂的多频动态力学性能特征量。结果表明,DF推进剂的动态力学过程除了α转变外,有两个β转变峰,其中β1转变峰是DNTF的作用。DNTF的含量对DF系列推进剂高低温动态力学性能有较大影响;α转变的损耗角正切tanδ的峰温Tα及α和β转变的自由体积膨胀系数αf均与NG/NC和DNTF/NC含量比的组合合量相关;当DNTF含量为20%时,推进剂具有最佳的高低温力学性能。

Effects of DNTF Contents on Dynamic Mechanical Properties of Modified Double-base Propellant

The effects of 3,4-dinitrofurzanfuroxan (DNTF) contents on dynamic mechanical properties of modified double-base propellants (DNTF-CMDB, DF) were studied by dynamic mechanical analyzer (DMA). The characteristic values of dynamic mechanical properties at multi-frequency for DF propellants were obtained. Results show that two β-relaxations, besides a α-relaxation, appear on DMA curves of DF propellants, and β_1-relaxation is due to the effect of DNTF. It is shown that the DNTF content can obviously affect the dynamic mechanical properties of DF propellants. The correlations between the tanδ peak temperature T_α in the α-relaxation, the free volume expansion coefficients α_f of α-relaxation and β-relaxation and the sum of ratios NG/NC and DNTF/NC were obtained. The DF propellants with 20% DNTF have optimal mechanical properties at high and low temperatures.