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含能材料  2015 

PVB基高固体含量螺压推进剂力学性能

DOI: 10.11943/j.issn.1006-9941.2015.10.004

Keywords: 固体推进剂 聚乙烯醇缩丁醛(PVB) 力学性能 动态热机械分析

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Abstract:

为了研究聚乙烯醇缩丁醛(PVB)基高固体含量推进剂的力学性能,采用静态力学试验分析了不同黏度PVB、黏度为45 mPa·s和300 mPa·s的PVB配合和增塑剂邻苯二甲酸二丁酯(DBP)及乙酰柠檬酸三丁酯(ATBC)对PVB基高固体含量推进剂力学性能的影响。采用动态热机械分析(DMA)研究了不同黏度PVB和两种增塑剂对PVB基推进剂动态力学性能影响。结果表明,随着PVB黏度增加,推进剂高温(50 ℃)拉伸强度增大,常温(20℃)和高温延伸率降低。黏度为45 mPa·s与300 mPa·s的PVB以1:3的质量比配合做粘合剂可使推进剂拉伸力学性能达到含这两种单一黏度PVB的推进剂的中间值。用ATBC替代DBP,推进剂的低(-40 ℃)、常温延伸率下降33%。含黏度为45 mPa·s PVB的PVB基推进剂有较强的α-转变。含增塑剂DBP的推进剂有较强的β-转变

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