与液氧相容聚合物基体材料

为改善环氧树脂与液氧的相容性,研究了环氧／溴环氧／氰酸酯树脂三元共固化体系,并探讨了2-乙基-4-甲基咪唑 ( 2E4MZ ) 对于共固化体系的促进作用。实验发现,2E4MZ可以显著降低共固化体系在不同温度下的凝胶时间。采用傅立叶红外光谱跟踪固化过程,结果表明,无论在环氧基团过量还是氰酸酯基团过量情况下,2E4MZ均能够明显加快固化反应速度,同时增大固化产物中共聚产物的比例,提高反应的选择性。热分析、闪点和氧指数以及液氧冲击试验结果表明,2E4MZ促进的较低氰酸酯含量的共固化体系具有较好的抗氧化和阻燃性能,与液氧的相容性也得到较大幅度改善。采用咪唑促进这种相对简单有效的改性途径,可得到与液氧相容性较好的、综合性能理想、成本合理的环氧树脂体系。 

LIQUID OXYGEN COMPATIBLE POLYMER MATRIX SYSTEM

An Epoxy/Brominated Epoxy/Cyanate Ester co-curing system was studied for liquid oxygen compatible matrix resins, and a kind of imidazole 2E4MZ was introduced to the co-curing system. The gel times of the co-curing system at different temperatures indicate that 2E4MZ could effectively accelarate the co-curing reactions no matter whether epoxy or cyanate ester was excessive, which were confirmed by the FT-IR results. The FT-IR results also show that the cured resin structures are improved by 2E4MZ with more co curing structures such as oxazoline and oxazolidinone. The thermal analysis, flash point and oxygen index results indicate that the cured resin modified by 2E4MZ have better anti-oxidation and flame retardant properties. The liquid oxygen impact test results approve that the cured resin modified by 2E4MZ have better compatibility with liquid oxygen. This kind of modification is an easy and cheap way for epoxy systems to get better compatibility with liquid oxygen.