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回顾了丁羟推进剂湿老化与干燥恢复机理研究状况;指出了水分对氢键结构的影响;讨论了干燥条件下吸湿后的推进剂内部水分运行规律;以120 mm×25 mm×10 mm的长方体丁羟推进剂试样为研究对象,在多种温度和相对湿度(RH)条件下进行了湿老化试验;以30℃、RH=100%条件下湿老化5 d的长方体试样为研究对象,采用无水氯化锂作干燥剂进行了30℃的干燥恢复试验;对湿老化和干燥恢复后的推进剂进行了单向拉伸试验,并对拉伸断面拍摄了高分辨率微距数码照片,对湿老化后的部分试样进行了衰减全反射红外光谱分析。结果表明,吸湿初期主要是推进剂基体内部的氢键发生变化,吸湿后期推进剂基体与AP颗粒之间的氢键才可能发生变化;从前一种变化发展到后一种变化,要求吸湿率大于某一临界值;吸湿后氢键数量增多,红外特征频率低移。
The research status of the mechanism of wet aging and drying recovery of butanol propellants was reviewed. The effect of moisture on the hydrogen bonding structure was pointed out. The internal moisture movement rules of the propellants after moisture absorption under dry conditions were discussed. With 120 mm × 25 mm × 10 mm The samples of cuboid butadiene propellants were wet aged under the conditions of various temperature and relative humidity (RH). The samples of rectangular parallelepiped wet aged 5 days at 30 ℃ and RH = 100% , Using anhydrous lithium chloride as a desiccant at 30 ℃ drying recovery test; wet aging and drying recovery of the propellant after uniaxial tensile test, and the tensile section taken high-resolution macro digital Photos, the wet aging part of the sample was subjected to attenuated total reflection infrared spectroscopy. The results show that the initial hydrogen absorption is mainly due to the change of hydrogen bonds in the matrix of the propellant, and the hydrogen bonding between the matrix of the propellant and the AP particles is likely to change in the early stage of hygroscopic absorption. From the previous change to the latter change, A certain critical value; after hydrogen absorption, the number of hydrogen bonds increases, and the infrared characteristic frequency is shifted lower.