TEGDN含量和NC含氮量对TEGDN/NG混合酯双基推进剂力学性能的影响

采用无溶剂法制备了24种不同硝化三乙二醇(TEGDN)含量、不同NC含氮量的双基推进剂样品,并测试了其高温(50℃)、常温(20℃)和低温(-40℃)下的力学性能;讨论了TEGDN含量和NC含氮量对双基推进剂力学性能的影响。结果表明,混合酯双基推进剂的高温和常温抗拉强度随TEGDN含量增加而逐渐下降,在TEGDN质量分数较低(≤7.7%)时,随NC含氮量的升高呈降低趋势,在TEGDN质量分数较高(≥15.4%)时,随NC含氮量的升高呈先上升后下降的趋势;低温抗拉强度随TEGDN含量增加而逐渐升高,随NC含氮量的升高逐渐降低;高温、常温、低温下的断裂延伸率均随TEGDN含量增加逐渐上升,随NC含氮量的升高逐渐下降;提高TEGDN含量可以改善NC的塑化性能,但含氮量12.6%及以上的NC不易被良好塑化。

Effect of TEGDN Content and NC Nitrogen Content on Mechanical Properties of Double-base Propellant

The 24 kinds of double-base propellant samples with different TEGDN content, as well as NC nitrogen contents, were prepared by solvent-free method, and the mechanical properties at high temperature (50℃), room temperature (20℃) and low temperature (-40℃) were tested.The effect of TEGDN content and NC nitrogen content on the mechanical properties of double-base propellant was discussed.The results show that the tensile strength of mixed ester double-base propellant decreases gradually with the increase of TEGDN contents at the high temperature and room temperature, and when the mass fraction of TEGDN is lower than 7.7%, it shows a downward trend with the increase of nitrogen contents in NC, when the mass fraction of TEGDN is higher than 15.4%, it shows a trend of increase at first and then decrease with the increase of nitrogen contents in NC.The tensile strength of the samples increases gradually with the increase of TEGDN content at low temperature, then decreases gradually with the increase of nitrogen contents in NC.The elongation at break at high temperature, room temperature and low temperature increases gradually with the increase of TEGDN content, and decreases gradually with the increase of nitrogen content in NC.The plasticizing properties of NC can be improved by increasing the amount of TEGDN,but the NC with 12.6% or more nitrogen content can not be well plasticized.