不互溶体系中HMX基PBX微球的制备及性能表征OA北大核心CSTPCD

in order to explore the preparation method of spherical octogen(HMX),the preparation and properties of HMX in immiscible system were studied by three methods:dripping,undersurface drop formation,and microfluidic devices using dime-thyl sulfoxide as solvent,polydimethylsiloxane/carbon tetrachloride(volume ratio 1∶2)as non-solvent and nitrocellulose as binder.The morphology,crystal structure,thermal properties,friction sensitivity,and impact sensitivity of the HMX samples were characterized by scanning electron microscope,X-ray diffractometer,thermal analyzer,and sensitivity instrument.The results show that the spherical HMX with the particle sizes of about 1 500 µm,950 μm and 300 µm can be prepared by drip-ping method,undersurface drop formation and microfluidic devices,repectively.Each crystal form of HMX prepared by the three methods is the same as that of raw material HMX,which is βcrystal form.Compared with the raw material,the activa-tion energy of HMX prepared by the dripping method is increased by 141.22kJ/mol.Moveover,the impact sensitivity is re-duced by 2J,and the friction sensitivity is reduced from 120N to 240N.Compared with the raw materials,the activation en-ergy of HMX prepared by undersurface drop formation and microfluidic devices increases by 5 kJ/mol and 21 kJ/mol,repective-ly.There is no significant change in impact sensitivity.And the friction sensitivity is reduced from the original 120N to 216N,which means that the structure of the microsphere has achieved a good desensitization effect.