硝酸处理对碳纤维增强环氧树脂复合材料的性能影响

The Effect of Properties about Acid Treatment Carbon Fiber Surface of Carbon Fiber Reinforced Epoxy Resin Composites

以用浓硝酸处理改性后的碳纤维为增强体,用乙二胺(DBP)为固化剂,邻苯二甲酸二丁酯为增塑剂,以低分子量环氧树脂(E-51)为基体制备碳纤维增强环氧树脂复合材料(CFRP)。SEM测试表明用酸处理碳纤维后,碳纤维表面的极性和粗糙度得到了提升。DMA测试表明储能模量和玻璃化温度都得到了显著提升。控制酸处理时间,可以明显改善碳纤维和环氧树脂之间的结合力,提高复合材料的力学性能。

In this paper, we use carbon fiber treated with concentrated nitric acid as reinforcement,ethylenediamine as curing agent, DBP as plasticizer and low-molecular-weight epoxy resin as matrix to prepare CFRP. We use hand lay-up molding to prepare carbon fiber reinforced epoxy resin composites. The SEM test shows that the polarity and roughness of carbon fiber surface has been improved by the acid treatment of carbon fiber. The DMA test showed that the storage modulus and glass transition temperature has received a significant boost. The results show that the adhesion between carbon fiber and EP as well as mechanical properties are obviously improved by controlling the time that carbon fiber treated with concentrated nitric acid.