RG-1炸药的热分解特性

Thermal Decomposition Characteristics of RG-1 Explosive

根据升温速率分别为5、10、20K/min的DSC和TG-DTG曲线,研究了S-2黏结剂、PETN和RG-1炸药的热分解过程。分别用Coats-Redfern法、Ozawa法和NL-INT法获得S-2黏结剂、PETN和RG-1炸药的热分解动力学参数和机理函数,进而计算PETN和RG-1炸药在特征温度的热力学参数。结果表明,RG-1炸药的DSC曲线上呈现一个吸热熔化峰和一个放热分解峰,130℃以下的热稳定性良好。RG-1炸药的热分解机理属随机成核和随后生长,活化能、指前因子和机理函数分别为156.02kJ/mol、1017.29s和f(α)=43(1-α)[-ln(1-α)]14。RG-1炸药在放热分解峰温的活化焓、活化熵和活化自由能分别为152.17kJ/mol、74.04J·K-1·mol-1和117.89kJ/mol。

The thermal decomposition processes of S-2 binder,PETN and RG-1 explosives were studied by the DSC and TG-DTG curves at heating rates of 5,10 and 20 K · min-1,respectively.The thermal decomposition kinetic parameters and the mechanism function of S-2 binder,PETN and RG-1 explosives were obtained by Coats-Redfern method,Ozawa＇s method and NL-INT method respectively,and the thermodynamic parameters of PETN and RG-1 explosives on the characteristic temperature were calculated.The results show that DSC curve of the RG-1 explosive reveals an endothermic melting peak and an exothermic decomposition peak,it has better thermal stability below 130℃.The thermal decomposition mechanism of RG-1 explosive is classified as random nucleation and growth mechanism,the activation energy,pre-exponential factor and mechanism function are 156.02 kJ · mol-1,1017.29s-1and f（α） =4/3 （1-α） [-ln（1-α）] 1/4,respectively.The enthalpy of activation,entropy of activation and free energy of activation for RG-1 explosive on the temperature of exothermic decomposition peak are 152.17 kJ · mo1-1,74.04J · K-1 · mol-1 and 117.89kJ · mol-1.