Nano-TATB was developed in microchannels by physical method and chemical method,respectively.The effects of total flow rate,number of microreactor plates,solvent/non-solvent ratio and temperature on the particle size ...Nano-TATB was developed in microchannels by physical method and chemical method,respectively.The effects of total flow rate,number of microreactor plates,solvent/non-solvent ratio and temperature on the particle size of TATB in the physical method were studied.Prepared TATB were characterized by Nano Sizer,Scanning Electron Microscopy,Specific surface aperture analyzer,X-ray diffraction,Fourier transform infrared spectroscopy and Differential Scanning Calorimetry.The results show that the TATB obtained by physical method and chemical method are spherical,with average particle size of 130.66 nm and 108.51 nm,respectively.Specific surface areas of TATB obtained by physical and chemical methods are 21.37 m^(2)/g and 21.91 m^(2)/g,respectively.Compared with the specific surface area of micro-TATB(0.0808 m^(2)/g),the specific surface area of nano-TATB is significantly increased.DSC test results show that the smaller the particle size of TATB,the lower the thermal decomposition temperature.In addition,by simulating the mixing state of fluid in microchannels and combining with the classical nucleation theory,the mechanism of preparing nano-TATB by microchannels was proposed.展开更多
采用高能机械球磨法制备出平均粒径为58.1 nm的纳米TATB。利用SEM分析表征了纳米TATB的微观形貌,并统计了纳米TATB的粒度分布。利用XRD、IR和XPS表征了纳米TATB的晶型、分子结构和表面元素等。采用DSC和DSC-IR联用系统对纳米TATB的热分...采用高能机械球磨法制备出平均粒径为58.1 nm的纳米TATB。利用SEM分析表征了纳米TATB的微观形貌,并统计了纳米TATB的粒度分布。利用XRD、IR和XPS表征了纳米TATB的晶型、分子结构和表面元素等。采用DSC和DSC-IR联用系统对纳米TATB的热分解活化能和热分解产物进行了分析。结果表明,纳米TATB的表观热分解活化能(ES=341.2 k J/mol)相比原料TATB(ES=354.4 k J/mol)降低了13.2 k J/mol,说明纳米TATB的反应活性更高。纳米TATB的主要分解产物为CO_2,同时伴有一定量的N_2O和NO_2生成。热感度实验表明,纳米TATB的5 s爆发点(T5s)高于原料TATB的T5s,说明纳米TATB的热稳定性更高。展开更多
基金National Natural Science Foundation of China(No.21875109)to provide fund for conducting experiments.
文摘Nano-TATB was developed in microchannels by physical method and chemical method,respectively.The effects of total flow rate,number of microreactor plates,solvent/non-solvent ratio and temperature on the particle size of TATB in the physical method were studied.Prepared TATB were characterized by Nano Sizer,Scanning Electron Microscopy,Specific surface aperture analyzer,X-ray diffraction,Fourier transform infrared spectroscopy and Differential Scanning Calorimetry.The results show that the TATB obtained by physical method and chemical method are spherical,with average particle size of 130.66 nm and 108.51 nm,respectively.Specific surface areas of TATB obtained by physical and chemical methods are 21.37 m^(2)/g and 21.91 m^(2)/g,respectively.Compared with the specific surface area of micro-TATB(0.0808 m^(2)/g),the specific surface area of nano-TATB is significantly increased.DSC test results show that the smaller the particle size of TATB,the lower the thermal decomposition temperature.In addition,by simulating the mixing state of fluid in microchannels and combining with the classical nucleation theory,the mechanism of preparing nano-TATB by microchannels was proposed.
文摘采用高能机械球磨法制备出平均粒径为58.1 nm的纳米TATB。利用SEM分析表征了纳米TATB的微观形貌,并统计了纳米TATB的粒度分布。利用XRD、IR和XPS表征了纳米TATB的晶型、分子结构和表面元素等。采用DSC和DSC-IR联用系统对纳米TATB的热分解活化能和热分解产物进行了分析。结果表明,纳米TATB的表观热分解活化能(ES=341.2 k J/mol)相比原料TATB(ES=354.4 k J/mol)降低了13.2 k J/mol,说明纳米TATB的反应活性更高。纳米TATB的主要分解产物为CO_2,同时伴有一定量的N_2O和NO_2生成。热感度实验表明,纳米TATB的5 s爆发点(T5s)高于原料TATB的T5s,说明纳米TATB的热稳定性更高。
基金National Natural Science Foundation of China(11272292,11372288)National High Technology Research and Development Program of China(863Program)(2013AA050905)+2 种基金the Chunhui Program of Ministry of Education of China(Z2014084)Development Foundation of CAEP(2014B0302041)Young Talent Foundation of Institute of Chemical Materials(KJZX-201403)
