In-situ Formation And Study Of Carbon-based Copper Azide Nano-composite

As an easy-prepared compound,copper azide has excellent explosive performance and potential to replace lead azide.But its high sensitivities,especially electrostatic sensitivity,hinder its further practical applications.In order to reduce its sensitivity and keep its explosive performance,a novel,green and facile strategy to synthesize copper azide@porous carbon hybrids(CA@PC)based on ionic crosslinked hydrogel with the low-cost cellulose derivatives as starting material was developed.This work paves the way toward the designing and developing next generation highly efficient energetic materials and many other fields.The main research results are as follows:1.Composites have been vacuum-impregnated based on Carbon nanotube(CNT).The vacuum-impregnated product doesn’t have enough loading amount,and it’s nessary to prepare CA@PC by in-situ formation based on hydrogel.2.Ionical-linked hydrogels have been synthesized based on three kinds of polymer,CMC,SA and PAA.The optimum pH of gelation(3~5)was chosen by self-healing and swelling-restrict action of hyrdogel.The carbonized condition was chosen by TG-MS data which shows carbonization process without oxygen.3.CMC-Cu and PAA-Cu have been carbonized to make well-dispersed copper@carbon(Cu@PC)in different conditions.Cu@PC would only be got when carbonization was carried on at 400 ~oC for 120 min or 500 ~oC for 15 min.Confirmed by characterization datas,copper nano-particles are confined into carbon frameworks and their diameters are less than 30 nm.After azidation,CA@PC was got with high heats of formation process(1392.88 kJ/mol)and good thermal stability.4.Sensitivities of CA@PC has been tested with vacuum-impregnated CA/VC as control group.These sensitivities were compared with those of LA/LS and CA/C physical mixtures to analysis mechanism of reducing electrostatic sensitivity.CA@PC shows effectively reduced electrostatic sensitivity(1.06 mJ)and excellent ingnition ability(47 cm).the honeycomb structural units of porous carbon act a s conductive explosion-proof cages(like Faraday cages)for the sensitive energetic materials because that an external electrical field would cause the uniform distribution of electric charges within the cage’s conducting material.Carbon frameworks can also improve thermal conductivity of CA@PC which refers to its high flame sensitivity.