ZHAO ZeHua, MA Yan, SHEN ZhiGang, CHEN Liang, WANG XiaoXu, LIU Jie
The surface of dry-jet wet spun carbon fibers (CFs) is relatively smooth compared with those of wet spun CFs, which results in weak interfacial interactions between the fiber and the polymer resin. A surface functionaliza- tion treatment is particularly important to unleash the full potential of the superior mechanical properties of dry-jet wet spun CFs. In this study, the effects of electrochemical oxidation treatment time and current density on the sur- face structures and the mechanical properties of dry-jet wet spun CFs were investigated. The interlaminar shear strength of the CFs improves significantly from 69 to 84 MPa after 120 s of treatment. Further structural analysis re- veals that the improvements are due to the addition of oxygen-containing functional groups and the optimization of the morphology on the surface of the CFs.