为了探究环氧树脂(EP)对双马来酰亚胺树脂(BMI)的增强增韧效果,分别采用4种EP:AFG-90、TDE-85、E-14、D-17,用以改性BMI树脂基体,并同碳纤维方格布(CF)制成了CF/BMI-EP复合材料(CM).采用差示扫描量热分析(DSC)测试了BMI和4组EP改性BMI的固化曲线和树脂固化后的玻璃化转变温度(Tg);采用傅立叶转换红外光谱仪(FTIR)测试了树脂体系固化后的红外吸收光谱;采用万能力学试验机测试了各组CM的弯曲性能和冲击韧性,观察记录了试样破坏的断裂形貌;采用扫描电镜(SEM)对CM试样的层间断面进行了形貌分析.研究发现,EP和BMI先后进行相对独立的固化,混合树脂相容性良好.实验发现,TDE-85的增强效果最佳,D-17的增韧效果最佳,并满足增强增韧规律.AFG-90、TDE-85、D-17改性BMI的Tg都在200℃以上,表明EP在改性BMI的同时并未牺牲耐热性.
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