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Synthesis of multifunctional additives for solid propellants:Structure,properties and mechanism

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To simplify the composite propellant formulation and address the current issue of the single-functionality present in existing additives,the multi-cyano,amine-based polybutadiene(AEHTPB-CN)was prepared based on AEHTPB by adopting appropriate synthesis strategies.By replacing 10％of HTPB binder in the propellant formulation,it can effectively enhance the interfacial bond strength between the propellant binder matrix and solid fillers(AP(ammonium perchlorate)and RDX(cyclotrimethylene-trinitramine)),the mechanical properties of the HTPB/AP/RDX/Al propellant were superior to blank control propellant with an improvement of 35.4％in tensile strength,62.0％enhancement in elongation at break,and reduce the propellant burn rate by 10.7％with any energy loss.The function mechanism of AEHTPB-CN was systematically elucidated through experiments and computer simulation techniques.The results show that the tertiary amine group in AEHTPB-CN can react with AP to form ammonium ionic bonds,and the hydroxyl and cyano groups can form hydrogen bonding interactions with AP,which enables AEHTPB-CN to be firmly adsorbed on the AP surface through chemical and physical interactions.For RDX,the interfacial bonding effect of AEHTPB-CN is attributed to their ability to form C-H…N≡C weak hydrogen bonding interaction between the cyano group and RDX methylene group.

Hydroxyl-terminated polybutadiene(HTPB)HTPB propellantChemical modificationBonding agentMechanism

Pingan Zhang、Lina Sun、Jianmin Yuan、Jianru Deng

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College of Chemistry and Chemical Engineering,Hunan University,Changsha 410082,PR China

Hu Bei Sanjiang Aerospace Jianghe Chemical Technology Co.,Ltd,Yichang 444200,PR China

College of Material Science and Engineering,Hunan University,Changsha 410082,PR China

2024

10.1016/j.dt.2023.06.009

防务技术
中国兵工学会

防务技术

CSTPCD
影响因子：0.358
ISSN：2214-9147
年,卷(期)：2024.33(3)
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