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.
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