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兵工学报 ›› 2023, Vol. 44 ›› Issue (7): 2014-2022.doi: 10.12382/bgxb.2022.0283

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聚多巴胺包覆四孔发射药的结构与性能

崔立宝1,2, 杨钊1,2, 丁亚军1,2,*(), 周杰1,2, 肖忠良1,2   

  1. 1 南京理工大学 化学与化工学院, 江苏 南京 210094
    2 南京理工大学 特种能源材料教育部重点实验室, 江苏 南京 210094
  • 收稿日期:2022-04-17 上线日期:2023-07-30
  • 通讯作者:
  • 基金资助:
    国家自然科学基金项目(22005143)

Structure and Properties of Four-hole Polydopamine-coated Gun Propellant

CUI Libao1,2, YANG Zhao1,2, DING Yajun1,2,*(), ZHOU Jie1,2, XIAO Zhongliang1,2   

  1. 1 School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
    2 Key Laboratory of Special Energy Materials, Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
  • Received:2022-04-17 Online:2023-07-30

摘要:

针对现有球扁发射药的减面性燃烧、钝感剂迁移等突出问题,基于多巴胺(DA)在四孔发射药表面的自聚合反应获得聚多巴胺(PDA)包覆四孔发射药,利用扫描电镜和拉曼光谱研究其微观结构组成,采用热重分析仪、密闭爆发器等分析其热力学、燃烧等性能。研究结果表明:PDA能够较好地包覆于四孔发射药表面,且在四孔发射药表面团聚形成的颗粒尺寸可达5μm;PDA对四孔发射药的表面包覆作用显著提升了四孔发射药燃烧的渐增性,相比于原药,PDA包覆四孔发射药的初始活度Li和最大活度Lm分别降低了42.05%和60.25%,渐增性系数提高了53.90%;经加速老化后PDA包覆四孔发射药的燃烧性能变化较小,55℃老化30d后其LiLm仅分别升高了1.69%和0.59%,表明PDA包覆四孔发射药具有良好的长贮稳定性。

关键词: 四孔发射药, 聚多巴胺, 表面包覆, 燃烧性能

Abstract:

To address issues such as regressive burning and deterrent migration in oblate spherical propellants, we developed a novel four-hole gun propellant coated with polydopamine (PDA) through self-polymerization of dopamine (DA) on the propellant’s surface. The microstructure, thermodynamics, and combustion performance of the propellant were analyzed using scanning electron microscope, Raman spectrometer, thermogravimetric analyzer, and closed bomb vessel. The results show that PDA can be well coated on the propellant’s surface, and the particle size of PDA can reach 5μm. The surface coating effect of PDA on the propellant can significantly improve the incremental combustion of propellant, resulting in a 42.05% decrease in initial burning activity (Li), a 60.25% decrease in maximum burning activity (Lm), and a 53.90% increase in burning progressivity index. After accelerated aging, the combustion performance of the PDA-coated four-hole gun propellant changed slightly. After accelerated aging at 55℃ for 30 days, the Li and Lm only increased by 1.69% and 0.59%, respectively, indicating high long-storage stability for the PDA-coated four-hole gun propellant.

Key words: four-hole gun propellant, polydopamine, surface coating, combustion performance