摘要
To enhance the overall performance of cyclotrimethylenetrinitramine(RDX),a modification strategy for RDX via in situ coordination with monometallic polydopamine(PDA)coatings(PDA-Fe,PDA-Cu,and PDA-Pb)was developed.The thermal properties of pristine RDX and its modified variants(RDX@PDA-Fe,RDX@PDA-Cu,RDX@PDA-Pb)were characterized using differential scanning calorimetry(DSC)and accelerating rate calorimetry(ARC).The impact sensitivity of these materials was evaluated via the characteristic drop-height method.The results demonstrate that PDA-metal metal coatings—formed through coordination between PDA and single metal ions(Fe^(3+),Cu^(2+),or Pb^(2+))—significantly enhance RDX′s thermal stability while attenuating its mechanical sensitivity.These coatings act as energy-absorbing barriers against external stimuli,effectively mitigating RDX′s sensitivity.Furthermore,they elevate RDX′s thermal stability by increasing its decomposition onset temperature and accelerating its decomposition kinetics.The monometallic coatings also catalyze RDX′s thermal decomposition and combustion,with Cu and Pb exhibiting particularly distinct catalytic effects.
为了提高环三亚甲基三硝胺(RDX)的全性能,研究了单金属聚多巴胺(PDA)涂层(PDA-Fe、PDA-Cu和PDA-Pb)通过原位配位对RDX进行改性;通过差示扫描量热仪(DSC)和绝热加速量热仪(ARC)测试了RDX、RDX@PDA-Fe、RDX@PDA-Cu和RDX@PDA-Pb的热性能;通过特性落高法测试了RDX、RDX@PDA-Fe、RDX@PDA-Cu和RDX@PDA-Pb的撞击敏感度。结果表明,通过PDA与单一金属离子相互作用形成的PDA金属涂层(Fe^(3+),Cu^(2+),或Pb^(2+)),显著改善了RDX的热性能和机械感度,说明涂层降低了RDX的敏感性,PDA金属层充当了外部机械刺激的能量吸收屏障;涂层增强了RDX的热稳定性,提高了其熔点,同时降低了其分解温度;单金属涂层也催化了RDX的热分解和燃烧,其中Cu和Pb表现出特别强的催化作用。
出处
《火炸药学报》
北大核心
2025年第8期763-769,I0004,共8页
Chinese Journal of Explosives & Propellants
基金
National Natural Science Foundation of China(No.22405249)
Open Project of Key Laboratory of Rubber Research Institute,Chinese Academy of Tropical Agricultural Science in 2025(No.RRI-KLOF202402)。
