贮存温度对丁羟推进剂老化性能影响的研究

A STUDY OF EFFECTS OF STORAGE TEMPERATURE ON AGEING CHARACTERISTICS OF HTPB PROPELLANTS

关键词:  端羟基聚丁二烯推进剂  老化试验

Key words:  Hydroxy terminated polybutadiene propellant  Ageing test

摘要:

本文研究了贮存温度对丁羟推进剂老化性能的影响.实验是在空气中进行的,老化性能以推进剂强度、伸长率、硬度和失重%等参数为判据.实验结果表明:在同一贮存温度下,随着老化时间的延长,推进剂的强度增加,伸长率降低,硬度增加,失重%亦有所增长.提高贮存温度的影响是加速了这些性能的变化.根据伸长率的数据,表明在本文给定的贮存温度下,老化反应机理是相似的.本文还以Arr-henius图求得表观活化能为49.6kJ/mol,并进而用公式求得25℃下推进剂应变保留值(ε/ε_o)与贮存安全期的关系图.

Abstract:

In this paper, the effects of the storage temperature on the ageing characteristics of HTPB propellants have been studied. The experiment was done in air. The ageing characteristies were expressed by the parameters, such as tensile strength, elongation, hardness, and weight loss of HTPB propellants etc. The experimental results have showed that at the same storage temperature, the tensile strength raised, the elongation reduced, the hardness raised and the weight-loss raised a little with the increased of storage-time. The higher storage temperature will accelerate the change of the paramenters.According to the measuring data of the elongation of HTPB propellants, it showed that at the storage temperature given in this paper, the mechanism of the ageing reaction is simular. The E-value of 49.6kJ/mol can be obtained from the Arrhenius polts, and furthermore the (ε/ε0) value vs. Storage-life polts of HTPB propellants can be determined through the formula at 25℃.