叠氮聚合物改性单基球形药的制备及性能研究OA

In order to reduce the mechanical sensitivity and improve the performance of nitrocellulose(NC)single-base spheri-cal powders,a series of azide polymer modified single-base spherical powders were prepared by introducing azide polymers in-to NC single-base spherical powders through the solvent volatilization method.The spherical formation quality,thermal proper-ties and mechanical sensitivity of spherical powders were characterized by laser particle sizer,SEM,TG-DTG,DSC and me-chanical sensitivity tester.The results show that the average particle size of the azide polymer modified single-base spherical powders is drastically reduced from 482.17 μm to 116.87-298.22 μm compared with that of the NC single-base spherical powders,and the particles are of good dispersibility.In addition,the azide polymer modified single-base spherical powders have more excellent thermal safety,with the thermal critical explosion temperature(Tb)and self-accelerated decomposition temperature(TSADT)increasing from 183.55 ℃ and 174.58 ℃ to 189.01-194.37 ℃ and 180.30-185.09 ℃,respective-ly.Meanwhile,the mechanical sensitivity of the azide polymer modified single-base spherical powders is significantly reduced.The friction sensitivity and impact sensitivity of the azide polymer modified single-base spherical powders are reduced by 30.26％—65.32％and 23.29％—41.10％,respectively.The results indicates that the azide polymer modified spherical powders have been significantly improved in terms of particle forming quality and service safety.