双基球扁药中的钝感剂迁移现象及其对燃烧性能的影响

为研究双基球扁药贮存过程中钝感剂的迁移现象,采用显微拉曼技术,表征了经加速老化后小分子钝感剂邻苯二甲酸二丁酯(DBP)和高分子钝感剂聚新戊二醇己二酸酯(NA)在双基球扁药中的浓度分布状态;并利用密闭爆发器试验,测试了双基球扁药的燃烧性能。结果表明,在由表及里的一维方向上,钝感剂DBP、NA的浓度呈指数规律变化,符合Fick第二扩散定律;加速老化过程中,在双基球扁药中DBP的迁移是双向的,钝感剂分布的浓度梯度会逐渐降低,扩散深度增加,浓度峰值位置向内偏移,双基球扁药燃烧渐增性能也随之下降;高温会加剧钝感剂的迁移现象,65,75,85℃高温条件下老化10天的球扁药样品,其燃烧渐增性特征值分别为1.3351、1.2917、1.1888;随着温度的升高,双基球扁药的燃烧渐增性能下降幅度也随之加大;而在相同条件下,NA较DBP具有更好的抗迁移特性。

Migration Phenomenon of Deterrent in Double-base Oblate Spherical Propellant and Its Influence on Combustion Performance

In order to study the migration phenomenon of deterrent in double-base oblate spherical propellant during storage,mi-cro-Roman technique was used to characterize the concentration distribution of dibutyl phthalate(DBP)and poly(neopentyl gly-col adipate)(NA)in double-base oblate spherical propellant after accelerated aging;and the combustion performance of dou-ble-base oblate spherical propellant was tested by the closed bomb test.Results show that the concentration of DBP and NA changed exponentially from the surface to the inside in one-dimensional direction,which conformed to Fick’s second diffusion law.During the accelerated aging process,the migration of DBP in double-base oblate spherical propellant was bidirectional,the concentration gradient of deterrent decreased gradually,the diffusion depth increased,the peak position of concentration shifted inward,and the combustion performance of double-base oblate spherical propellant also gradually decreased.High tem-perature would aggravate the migration of deterrent.The progressive combustion characteristic values of double-base oblate spherical propellant samples aged at 65℃,75℃and 85℃for 10 days were 1.3351,1.2917 and 1.1888,respectively.With the increase of temperature,the progressive combustion characteristic values of double-base oblate spherical propellant decreased.Under the same aging conditions,the anti-migration characteristics of NA was higher than that of DBP.