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Thermo-oxidative aging behavior of high-cis1,4-hydroxyl-terminated polybutadiene 认领 引用
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作者 Xiaoyi Yang Lipeng Sang +3 位作者 Bowen Tao Pingan Zhang Jianru Deng Deqian Meng 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第8期396-406,共11页
This study investigates the thermo-oxidative aging behavior of high-cis hydroxyl-terminated polybutadiene(cis-HTPB,cis-1,4 content>90%)through integrated multi-scale experiments and molecular simulations.Experiment... This study investigates the thermo-oxidative aging behavior of high-cis hydroxyl-terminated polybutadiene(cis-HTPB,cis-1,4 content>90%)through integrated multi-scale experiments and molecular simulations.Experimental results demonstrate that cis-HTPB significantly outperforms traditional HTPB(I-HTPB)in terms of inhibiting oxidative chain scission,maintaining structural stability,and delaying the degradation of mechanical properties.The simulation results further reveal the molecular-level reasons for the performance advantages:the cis-1,4 structure enhances chain flexibility and free volume,facilitating the uniform diffusion of oxygen and free radicals,effectively suppressing local oxidation,and delaying crosslink network formation.In contrast,I-HTPB,due to its highly reactive 1,2-vinyl structure and limited free volume,initiates intense surface-dominated radical chain reactions.These findings establish that cis-HTPB improves binder aging resistance by modulating oxygen diffusion pathways and radical reaction sites,thereby providing a theoretical foundation for the development of long-life solid propellants for deep-space missions. 展开更多
关键词 Cis-HTPB Binder Thermo-oxidation ageing Aging mechanism
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Properties of high cis-1,4 content hydroxyl-terminated polybutadiene and its application in composite solid propellants 认领 引用 被引量：5
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作者 Deqian Meng Lipeng Sang +2 位作者 Pingan Zhang Jianru Deng Xiang Guo 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2024年第10期199-209,共11页
In this paper,high cis-1,4 content hydroxyl-terminated polybutadiene(cis-HTPB)with different molecular weights was prepared through the oxidative cracking process using cis-butadiene rubber as raw material.Firstly,thi... In this paper,high cis-1,4 content hydroxyl-terminated polybutadiene(cis-HTPB)with different molecular weights was prepared through the oxidative cracking process using cis-butadiene rubber as raw material.Firstly,this article comprehensively compared the differences between cis-HTPB and conventional I-HTPB in terms of molecular weight distribution,functionality,viscosity,molecular polarity,and other physicochemical properties,which provided effective data support for its subsequent application.In addition,the reaction kinetics study showed that cis-HTPB with isocyanate curing agent has high reactivity,allowing it to be rapidly cured at low temperatures,and the cured elastomers had excellent mechanical properties,with tensile strength and elongation up to 1.89 MPa and 1100%,respectively.It was also found that cis-HTPB has extremely excellent low-temperature resistance,and the glass transition temperature(Tg)of its cured elastomer is as low as-101℃.Based on the above studies,cis-HTPB is applied as a binder in composite solid propellants for the first time to investigate its practical performance,and the results indicated that cis-HTPB-based propellants have excellent process and mechanical properties. 展开更多
关键词 High cis-1,4 content-HTPB(cis-HTPB) Low-temperature resistance Comparison of physicochemical properties cis-HTPB curing process cis-HTPB based propellant
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