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).

• Journal: Diamond And Related Materials
• Volume: 109
• Issue:
• Pages:
• ISSN: 0925-9635
• DOI:
• Year: 2020
• Number:
• Type: Journal Article