SEBS与常用单质炸药的相容性研究OA北大核心CSTPCD

The compatibility between thermoplastic elastomer hydrogenated styrene-butadiene-styrene block copoly-mers(SEBS)and single-compound explosives hexogen(RDX),octogen(HMX)and hexanitrohexaazaisowurtzitane(CL-20)commonly used in solid propellants was studied by using theoretical trigger bond length trends in molecular dynamics(MD)simulation and decomposition temperature changes in differential scanning calorimetry(DSC)measurements.The results of MD simulation show that the maximum trigger bond length of RDX,HMX and CL-20 in explosive/SEBS blend systems increases with temperature.Compared to the single-component explosive systems,the maximum trigger bond length changes little after blending with SEBS.It is speculated that RDX,HMX,and CL-20 all have good stability after blending with SEBS and is less prone to cause trigger bond fracture.In DSC results,after blending with SEBS,the thermal decom-position temperature changes of RDX,HMX and CL-20 are less than 3℃,indicating that the compatibility of SEBS with RDX,HMX and CL-20 is good.Furthermore,a system of 1,3-dimethyl-1,3-diphenylurea(C2)and 3,4-dinitrofurazan-furoxan(DNTF)with poor compatibility was chosen as the control system for MD simulation and DSC analysis.The maxi-mum trigger bond length significantly increases,and the decomposition temperature in DSC decreases by more than 70℃,which verifies the feasibility of predicting the compatibility by using trigger bond length.