微烟NEPE推进剂及其粘合剂胶片的动态力学性能研究

摘要

The dynamic mechanical properties of NEPE propellant with minimum signature and its binder film were measured by dynamic mechanical analyzer. The results show that the mechanical loss (loss tangent and loss module) curves of the propellant and its binder film consist of α and β relaxations,which are caused by motion of the binder molecules and motion of plasticizer molecules associated with binder sidegroups,respectively. It is found that the magnitudes of tan δ (loss tangent) and loss modules of two relaxation processes of the propellant are obviously higher than those of the binder film because of the addition of nitramine in propellant. It is also found that viscoelastic coefficients from WLF equation and activation energy from relaxation processe of the propellant are lower than those of the binder film,which gives proofs that nitramine increases the free volume of the binder system and weakens the interactions of the molecular chains,further explains why the mechanical loss,tan δ,of the propellant is higher than that of the binder film.%采用动态力学分析方法研究了微烟NEPE推进剂及其粘合剂胶片的动态力学性能.结果表明,微烟NEPE推进剂及其粘合剂胶片的tan δ(损耗角正切)曲线均存在α和β转变峰,分别由增塑剂和粘合剂体系的玻璃化转变引起,加入硝胺填料使两个转变过程的力学损耗tan δ增大,峰温向高温移动.微烟NEPE推进剂的试验常数和表观活化能均低于其粘合剂胶片对应的值,表明加入硝胺填料会增大粘合剂分子运动的自由体积,减弱分子链间的相互作用,可以解释微烟NEPE推进剂的力学损耗tan δ大于粘合剂胶片的原因.