To investigate the coupling mechanisms of detonation energy release between the TiH_(2)/PTFE active shell and RDX explosive,an RDX-based active shell thermobaric explosive containing TiH_(2)/PTFE powders was prepared....To investigate the coupling mechanisms of detonation energy release between the TiH_(2)/PTFE active shell and RDX explosive,an RDX-based active shell thermobaric explosive containing TiH_(2)/PTFE powders was prepared.The effects of the TiH_(2)/PTFE mass ratio on the shock wave parameters and afterburning effect of the thermobaric explosives were investigated.The energy release characteristics of the optimal TiH_(2)/PTFE ratio under varying vacuum degrees were evaluated using a 0.9 m3 spherical explosive chamber and colorimetric thermometry method.The experimental results demonstrated that as the PTFE powders content in the active shell increased,the shock wave intensity,explosion fireball duration,and maximum average temperature of the thermobaric explosives initially increased and then decreased,peaking at a TiH_(2)/PTFE mass ratio of 1:1.Compared to the TiH_(2)-based thermobaric explosives without PTFE,the 1:1 TiH_(2)/PTFE formulation exhibited increases of 45.9%in peak overpressure,69.7%in fireball duration,and 7.2%in maximum average temperature.Thus,an optimal PTFE content significantly enhances the energy release efficiency of the RDX/TiH_(2)/PTFE thermobaric explosives.Furthermore,the energy release efficiency of thermobaric explosives was influenced by the vacuum degree,with the maximum average temperature,peak overpressure,positive impulse,positive pressure action time,and fireball duration decreasing by 10.8%,35.3%,52.1%,65.5%,and 46.4%,respectively,as the vacuum degree increased from 0 to 52.4%.展开更多
We employed oxygen plasma treatment to activate the PTFE surface and introduce oxygencontaining polar groups(-OH,C-O,C=O),thereby enhancing surface energy and interfacial reactivity.We subsequently composited the modi...We employed oxygen plasma treatment to activate the PTFE surface and introduce oxygencontaining polar groups(-OH,C-O,C=O),thereby enhancing surface energy and interfacial reactivity.We subsequently composited the modified PTFE(PTFE-O)with graphene oxide(GO),enabling tight interactions between the two phases through hydrogen bonding and van der Waals forces.Comprehensive characterizations,including XPS,FTIR,SEM,and contact angle analysis,confirmed the successful surface modification and uniform dispersion of GO.The optimized PTFE-O/GO composite exhibits a low resistivity of 2.41×10^(3)Ω·cm under a compression pressure of 2 MPa,demonstrating markedly improved conductivity and antistatic performance.These findings provide an effective route for constructing conductive PTFE-based composites and offer new insights into interface-engineered antistatic polymer materials.展开更多
基金supported by the Natural Science Research Excellent Youth Project of Anhui Educational Committee(Grant No.2023AH020026)and the National Natural Science Foundation of China(Grant No.12272001)the authors would like to thank the foundation for the financial supports.
文摘To investigate the coupling mechanisms of detonation energy release between the TiH_(2)/PTFE active shell and RDX explosive,an RDX-based active shell thermobaric explosive containing TiH_(2)/PTFE powders was prepared.The effects of the TiH_(2)/PTFE mass ratio on the shock wave parameters and afterburning effect of the thermobaric explosives were investigated.The energy release characteristics of the optimal TiH_(2)/PTFE ratio under varying vacuum degrees were evaluated using a 0.9 m3 spherical explosive chamber and colorimetric thermometry method.The experimental results demonstrated that as the PTFE powders content in the active shell increased,the shock wave intensity,explosion fireball duration,and maximum average temperature of the thermobaric explosives initially increased and then decreased,peaking at a TiH_(2)/PTFE mass ratio of 1:1.Compared to the TiH_(2)-based thermobaric explosives without PTFE,the 1:1 TiH_(2)/PTFE formulation exhibited increases of 45.9%in peak overpressure,69.7%in fireball duration,and 7.2%in maximum average temperature.Thus,an optimal PTFE content significantly enhances the energy release efficiency of the RDX/TiH_(2)/PTFE thermobaric explosives.Furthermore,the energy release efficiency of thermobaric explosives was influenced by the vacuum degree,with the maximum average temperature,peak overpressure,positive impulse,positive pressure action time,and fireball duration decreasing by 10.8%,35.3%,52.1%,65.5%,and 46.4%,respectively,as the vacuum degree increased from 0 to 52.4%.
基金Funded by the Key Scientific and Technological Project of Zhejiang Provincial Administration for Market Regulation(No.ZD2024004)the National Natural Science Foundation of China(Nos.62304214 and 62304213)+2 种基金the Natural Science Foundation of Zhejiang Province(No.LQ23E020006)the Chunhui Project Foun-dation of the Education Department of China(No.HZKY20220198)the Fundamental Research Funds for the Provincial Universities of Zhejiang(Nos.2021YW35,2021YW36 and 2022YW62)。
文摘We employed oxygen plasma treatment to activate the PTFE surface and introduce oxygencontaining polar groups(-OH,C-O,C=O),thereby enhancing surface energy and interfacial reactivity.We subsequently composited the modified PTFE(PTFE-O)with graphene oxide(GO),enabling tight interactions between the two phases through hydrogen bonding and van der Waals forces.Comprehensive characterizations,including XPS,FTIR,SEM,and contact angle analysis,confirmed the successful surface modification and uniform dispersion of GO.The optimized PTFE-O/GO composite exhibits a low resistivity of 2.41×10^(3)Ω·cm under a compression pressure of 2 MPa,demonstrating markedly improved conductivity and antistatic performance.These findings provide an effective route for constructing conductive PTFE-based composites and offer new insights into interface-engineered antistatic polymer materials.
