苯酚电聚合膜修饰炭纤维表面对 环氧基复合材料性能的影响

将连续炭纤维束用自制的空气梳分散成单丝状长带后, 通过采用循环伏安法的电化学方法将单体苯酚在炭纤维表面聚合成膜, 对炭纤维进行表面修饰, 以提高复合材料中炭纤维与树脂基体的界面粘结性能。红外光谱分析表明, 苯酚电聚合膜能够增加炭纤维表面的羟基、 醚键等活性官能团, 从而提高炭纤维与环氧树脂基体的界面粘结强度。与未进行表面修饰的炭纤维增强环氧树脂复合材料相比, 以聚苯酚膜修饰的炭纤维单丝带增强的环氧树脂基复合材料横向拉伸强度最大提高了90%, 纵向拉伸强度最大提高了45%, 层间剪切强度最大提高了110%。实验也表明, 将炭纤维束分散成炭纤维单丝带后能够更有效地增强复合材料的各项力学性能。

Effect of surface modification of carbon fiber by polyphenol film on the properties of epoxy resin composites

To achieve a better interfacial adhesion between the fiber and matrix in composites, the continuous carbon fiber bundle was separated to the single fiber tape by the self-made air comb, then modified by the polyphenol film, which was electropolymerized by a cyclic voltammogram technique. The IR spectrum indicates that the polyphenol film formed on the carbon fiber surface with amounts of active agents such as hydroxyl and ether group can enhance the interfacial adhesion between the carbon fiber and the epoxy resin of the composites. Compared with the epoxy resin composites reinforced by the carbon fiber without surface modification, the strength of transverse tension, longitudinal tension, and interlaminar shear of the epoxy resin composites reinforced by the carbon fiber tape modified with polyphenol film are improved by 90%, 45% and 110%, respectively. The experimental results also show that the carbon tape can increase the mechanical properties of the composites, much better than the carbon fiber bundle.