Effect of Ozone Treatment of Carbon Fibers on the Crack Resistance Properties of Epoxy Matrix Composite

In this work, the ozone treatment of carbon fiber surfaces was carried out to enhance the mechanical interfacial properties of carbon fiber-reinforced epoxy matrix composites. The surface properties of carbon fibers before and after treatments were studied by FT-IR, XPS, and contact angle measurements. Crack resistance of the composites was investigated using two types of testing methods, namely critical stress intensity factor (K$_{IC}$) and critical energy release rate (G$_{IC}$). FT-IR and XPS results showed that the number of oxygen functional groups such as OH, O-C=O, C=O, and C-O, increased on the carbon fiber surfaces after ozone treatment. The crack resistance of the ozone-treated carbon fiber composites also showed higher values than those of untreated carbon fiber composites. This may be attributed to the increase in the oxygen-containing functional groups or the degree of adhesion at interfaces between carbon fibers and the matrix resin in the composite system investigated.ted.

탄소섬유의 오존 처리가 에폭시 기지 복합재료의 크랙저항 특성에 미치는 영향