Preparation Of Nitramine Explosive/PDA Composite And Study On Its Desensitizing Performance

Nitroamine explosives such as hexanitrohexaazaisowurtzitane(CL-20),cyclotetramethylenetetramine(HMX),cyclotrimethylenetrinitramine(RDX)have high energy,high explosive pressure,high The characteristics of detonation heat can greatly improve the energy performance in the field of mixed explosives and solid propellants,but the high mechanical sensitivity of nitramine explosives limits its further application.The bionic material polydopamine(PDA)has super strong adhesion and can form a thin layer on the surface of any substrate.In this project,PDA was selected as the coating material,and the feasibility of PDA coating desensitization was estimated through theoretical calculations.CL-20 / PDA and CL-20 / PDA / CuO composite materials were prepared for experimental verification.In addition,HMX / PDA and RDX / PDA composite energetic materials,and their morphology,structure and properties were studied.The specific research content is as follows:(1)Theoretical simulation of CL-20 / PDA using molecular dynamics simulation methods.The results show that:(110)crystal plane of ?-CL-20 is tightly coupled with PDA,and(110)crystal plane is The binding energy is 893.2 k J / mol greater than the ?-CL-20(001)and ?-CL-20(020)crystal planes,indicating that the ?-CL-20(110)crystal plane has the strongest interaction with the PDA,indicating that the PDA It can be tightly coated on the surface of CL-20,which is expected to reduce the mechanical sensitivity of CL-20.(2)CL-20 / PDA composites were prepared by in-situ polymerization.The effects of reaction time and dopamine(DA)monomer concentration on the morphology,structure and properties of the composites were investigated.The results showed that the PDA was successfully coated on the surface of CL-20.The degree of desensitization of CL-20 / PDA composites increased first and then decreased with the change of reaction time and DA monomer concentration.When the reaction time was 9 h,DA When the monomer concentration is 2 g / L,the impact sensitivity of the composite is reduced by 61.8% compared with the raw material CL-20.In addition,nano-CuO was supported on the surface of CL-20 / PDA by in-situ generation method.After CuO was loaded,the mechanical sensitivity of the prepared composite material was reduced by 95.9% compared to the raw material CL-20 no effect.(3)Preparation of HMX / PDA,RDX / PDA composite materials by in-situ polymerization.The effects of reaction time and DA monomer concentration on the morphology,structure and properties of composites were investigated.The results show that the PDA was successfully coated on the surface of HMX and RDX,and the desensitization degree of the two composite materials increased first and then decreased with the increase of time and monomer concentration.When the reaction time is 9 h and the DA concentration is 2 g / L,the impact sensitivity of the HMX / PDA composite material is reduced by 60.5% compared with the raw material HMX,and the impact sensitivity of the RDX / PDA composite material is reduced by48.1% compared with the raw material RDX.