NEPE推进剂老化过程中结构与力学性能的关系

Relationship of Structure and Mechanical Properties in the Aging Process of NEPE Propellant

为考察NEPE推进剂的老化特性,在60,65,70和75℃老化了推进剂样品,研究了其在常温时的抗拉强度σm,初始模量E0与黏合剂母体凝胶质量分数ω、化学交联密度υe、物理交联密度υp之间的关系。用动态热机械分析仪(DMA)测试了多个频率下老化样品的损耗因子tanδ、损耗模量半高峰宽Dh/2。结果表明,高温加速老化过程中NEPE推进剂样品σm和E0下降的原因是推进剂黏合剂母体结构的ω,υe和υp下降。NEPE推进剂降解和解聚由黏合剂母体结构变化引起。

In order to analyze aging characteristics of nitrate ester polyether （NEPE） propellant, propellant samples were aged at 60℃ ,65℃,70 ℃ and 75℃. The relationship between the normal temperature mechanical properties, including maximum tensile strength σm and initial modulus E0, and the binder matrix structural cross linking parameters, including gel fraction to, chemical cross linking density veand physical cross linking density Up, was investigated. Dynamic mechanical parameters, including loss factor tanδ and half-height width of loss modulus Ds/2 at various frequencies, were measured by DMA. The results show that the decrease of values of am and E0 is caused by decline of binder matrix ω, ve and vp. Degradations and decompositions of binder matrix are caused by decline of structural parameters.