蒙脱土对丁羟推进剂力学性能和流变性能的影响

Effect of Montmorillonite on Mechanical and Rheological Properties of HTPB Propellant

为提高丁羟推进剂的力学性能,利用有机蒙脱土(OMMT)可被端羟基聚丁二烯(HTPB)剥离为纳米片层的特性,将OMMT引入到HTPB推进剂中,制备了OMMT改性的HTPB推进剂;利用拉伸试验机、流变仪研究了OMMT的引入对推进剂力学性能和流变性能的影响。结果表明,OMMT的引入可以显著提高HTPB推进剂的力学性能,同时起到增强增韧的效果,当在HTPB中引入质量分数2%的OMMT时,推进剂的力学性能最佳,最大拉伸强度和断裂伸长率分别提高了约78%和21%,其原因在于在黏结剂基体中,蒙脱土以纳米片层的形式存在于体系中,增强黏结剂基体的力学性能,从而提高推进剂的力学性能;OMMT的引入还可改善推进剂药浆的工艺性能,降低OMMT推进剂药浆的混合黏度,并加快推进剂药浆的固化速率。引入OMMT后,推进剂药浆的适用期由6.25h降至4.16h。

To improve the mechanical properties of hydroxyl-termineted polybutadiene propellant,using the property organic montmorillonite(OMMT)can be exfoliated into nanosheets by HTPB binder,the OMMT modified HTPB propellant was prepared by introducing OMMT into the HTPB propellant.The effect of OMMT introduction on the mechanical properties and rheological properties of propellant were investigated by using tensile testing machine and rheometer.The results show that the introduction of OMMT can significantly improve the mechanical properties of HTPB propellant,which has the effect of enhancing and toughening.The strength and elongation at break are increased by 78%and 21%,respectively.The reason may be that in the binder matrix,montmorillonite exists in the system in the form of nanosheets,which enhances the mechanical properties of the binder matrix.The introduction of OMMT can also improve the processing properties of the propellant slurry,reduce the mixing viscosity of the OMMT propellant slurry,and accelerate the solidification rate of the propellant slurry.After the introduction of OMMT,the pot life of the propellant slurry reduces from 6.25h to 4.16h.