Abstract In this study, electrospun PAN-based CNFs was functionalized using wet chemical oxidation method in order to improve the CNFs adhesion and bonding to matrix of Carbon composites. The process employed 3:2:0, 3:2:1 and 3:2:2 (v/v) mixture of H2SO4/HNO3/HCl acid solution. The effect of HCl concentration (concentration in the used acid solution) on CNFs structure and tensile strength of CNFs reinforced carbon composite was investigated via field emission scanning electron microscopy (FE-SEM), X-ray diffraction, XPS, Raman, FT-IR spectroscopy and tensile strength testing (ASTM 2008; ISRM 1978). The results confirmed creation of carboxyl (COOH) and hydroxyl (-OH) groups on the surface of acid treated CNFs. It was also clear from the results that oxygen atom concentration on the surface of treated CNFs has been increased that assigned to creation of functional groups on CNFs surface. In order to evaluate of CNFs acid treating effect on the composite tensile strength, each un-treated and acid treated CNFs was separately used as a reinforcing agent in the CNFC composites. The highest value of tensile strength was recorded for the composite reinforced by CNFs treated via 3:2:1 (v/v) mixture of H2SO4/HNO3/HCl (412 MPa).

中文翻译：

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通过湿化学氧化法对 CNF 进行功能化，以提高 CNF 对碳复合材料基体的附着力

摘要 本研究采用湿法化学氧化法对静电纺 PAN 基 CNFs 进行功能化，以提高 CNFs 对碳复合材料基体的附着力和结合力。该过程采用 H2SO4/HNO3/HCl 酸溶液的 3:2:0、3:2:1 和 3:2:2 (v/v) 混合物。通过场发射扫描电子显微镜 (FE-SEM)、X 射线衍射、XPS、拉曼、FT-IR 研究了 HCl 浓度（所用酸溶液中的浓度）对 CNFs 增强碳复合材料的 CNFs 结构和拉伸强度的影响光谱和拉伸强度测试（ASTM 2008；ISRM 1978）。结果证实在酸处理的 CNF 表面上产生了羧基 (COOH) 和羟基 (-OH)。从结果中还可以清楚地看出，处理过的 CNF 表面上的氧原子浓度已经增加，这归因于在 CNF 表面上创建了官能团。为了评估 CNFs 酸处理对复合材料拉伸强度的影响，将每种未处理和酸处理的 CNFs 分别用作 CNFC 复合材料中的增强剂。通过 H2SO4/HNO3/HCl (412 MPa) 的 3:2:1 (v/v) 混合物处理的 CNF 增强的复合材料记录了最高的拉伸强度值。