含CL-20的改性双基推进剂的热行为及非等温反应动力学

用DSC和TG方法研究了含六硝基六氮杂异伍兹烷(CL-20)的改性双基推进剂在常压(0.1 MPa)和高压(4和7 MPa)下的热行为和高压下的热分解反应动力学. 结果表明, 该推进剂常压下DSC曲线有3个放热峰, 相应TG曲线有3个失重过程; 而高压下DSC曲线只有一个放热峰, 高压下放热峰的峰温随加热速率增大而升高. 高压下该推进剂放热分解反应机理和反应动力学参数受测试环境压强影响较弱, 反应机理是随机成核和随后生长, 放热分解反应的动力学方程可以表示为, 4 MPa时, dα/dt=1014.5(1-α)-ln(1-α)]1/3e-17981.7/T; 7 MPa时, dα/dt=1014.7(1-α)·-ln(1-α)]1/3e-18138.1/T.

Thermal Behavior and Non-Isothermal Decomposition Reaction Kinetics of Composite Modified Double Base Propellant Containing CL-20

Thermal behavior under pressures of 0.1,4'and 7 MPa and non-isothermal decomposition reaction kinetics under pressures of 4 and 7 MPa of the composite modified double base propellant containing hexanitrohexaazaisowurtzitane (CL-20一CMDB propellant)were investigated by differential scanning calarimetry(DSC)and thermogravimetry(TG).The results showed that there were three exothermic peaks on DSC curve and three mass loss stages on TG curve under 0.1 MPa.There was only one exothermic peak on the DSC curve under 4 and 7 MPa.The exothermic peak temperatures under 4 and 7 MPa increased with increasing the heating rate.11le exothermic decomposition reaction mechanism and kinetic parameters of the propellant changed little with testing surroundings.The reaction mechanism was random nucleation and then growth.The kinetic equations of exothermical decomposition reaction can be expressed as,dα/dt=1014.5(1-α)-In(1-α)]1/3e-17981.7/T(undcr 4 MPa)and dα/dt=1014.7(1-α)-ln(1-α)]1/3e-18138.1/T(under 7 MPa).