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以聚醚推进剂为研究对象,进行了常温、不同相对湿度条件下的吸湿试验,得到了聚醚推进剂吸湿的规律,建立了以平衡含湿率作为表征聚醚推进剂吸湿特性特征参数的数学模型。结果表明,配方、工艺固定后,聚醚推进剂平衡含湿率与推进剂的初始含湿率无关,是材料自身的吸湿特性参数,主要取决于环境相对湿度。初始含湿率高可导致聚醚推进剂力学性能下降。同时,利用平衡含湿率参数,研究了常温下水分在聚醚推进剂中的扩散,得到了扩散系数的修正模型,发现依据平衡含湿率参数计算的扩散系数是与相对湿度无关的常数。
Taking polyether propellants as the research object, the hygroscopic test of polyether propellants was carried out under the conditions of normal temperature and different relative humidity. The equilibrium moisture content was used to characterize the moisture absorption characteristics of polyether propellants mathematical model. The results show that the equilibrium moisture content of polyether propellant has nothing to do with the initial moisture content of propellants after the formula and technology are fixed. It is the moisture absorption characteristic parameter of the material itself, which mainly depends on the relative humidity of environment. The high initial moisture content can lead to the decrease of mechanical properties of polyether propellants. At the same time, using the parameters of equilibrium moisture content, the diffusion of water in polyether propellant at room temperature was studied. The modified model of diffusion coefficient was obtained. It was found that the diffusion coefficient based on the equilibrium moisture content was a constant unrelated to relative humidity.