为快速准确测量端羟基聚丁二烯(HTPB)基浇注高聚物粘结炸药(PBX)在固化过程中的固化度,采用非等温差示扫描量热(DSC)法对HTPB基浇注PBX粘结剂体系在固化过程中的放热量进行测量,同时采用超声波纵波透射法对浇注PBX替代材料试样在固化过程中的超声波传播速度进行测量研究。结果表明:随着固化反应的进行,通过DSC法测得的不同固化时间下粘结剂体系的放热量逐渐减少,通过超声波纵波透射法测得超声波在浇注PBX替代材料试样内的传播速度逐渐增大。根据不同固化时间下放热量的数值可以计算出粘结剂体系在不同固化时间下的固化度,将DSC法与超声波纵波透射法对应,拟合得到超声波传播速度关于固化度的关系曲线,从而实现对浇注PBX替代材料试样固化度的快速、无损检测。
In order to quickly and accurately measure the curing degree of HTPB-based cast polymer bonded explosive (PBX) during the curing process,the heat release of HTPB-based cast PBX binder system during curing was measured by non-isothermal differential scanning calorimetry (DSC).At the same time,the ultrasonic propagation velocity of the cast PBX replacement material was measured by ultrasonic longitudinal wave transmission method.The results showed that with the curing reaction,the heat release of the binder system under different curing time measured by DSC method decreased gradually,and the propagation speed of ultrasonic wave in the sample of cast PBX replacement material increased gradually by ultrasonic longitudinal wave transmission method.The curing degree of the binder system under different curing time could be calculated according to the value of the heat data under different curing time.The relationship curve between ultrasonic propagation velocity could be fitted by corresponding DSC method and ultrasonic longitudinal wave transmission method,realizing the rapid and non-destructive testing of the curing degree of the cast PBX replacement material sample.
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