The effects of fiber surface-treatment and sizing on the dynamic mechanical properties of unidirectional and 2-directional carbon fiber/nylon 6 composites by means of dynamic mechanical analysis have been investigated in the present study. The interlaminar shear strengths of 2-directional carbon/nylon 6 composites sized with various thermosetting and thermoplastic resins are also measured using a short-beam shear test method. The result suggests that different surface-treatment levels onto carbon fibers may influence the storage modulus and tan δ behavior of carbon/nylon 6 composites, reflecting somewhat change of the stiffness and the interfacial adhesion of the composites. Dynamic mechanical analysis and short-beam shear test results indicate that appropriate use of a sizing material upon carbon fiber composite processing may contribute to enhancing the interfacial and/or interlaminar properties of woven carbon fabric/nylon 6 composites, depending on their resin characteristics and processing temperature.

• Dong-Hwan Cho(Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
• Suk-Hyang Yun(Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
• Jun-Kyung Kim(Polymer Hybrid Research Center, Korea Institute of Science and Technology)
• Soon-Ho Lim(Polymer Hybrid Research Center, Korea Institute of Science and Technology)
• Min Park(Polymer Hybrid Research Center, Korea Institute of Science and Technology)
• Geon-Woong Lee(Polymer Hybrid Research Center, Korea Institute of Science and Technology)
• Sang-Soo Lee(Polymer Hybrid Research Center, Korea Institute of Science and Technology)