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| Effect of Silica Sol Modification on the Tensile Property of Carbon Fiber/Epoxy Composites |
| YANG Hongbin WANG Jing WU Huimin FU Yaqin* |
| (Key Laboratory of Advanced Textile Materials and Manufacturing Technology Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018) |
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Cite this article:
YANG Hongbin WANG Jing WU Huimin FU Yaqin*. Effect of Silica Sol Modification on the Tensile Property of Carbon Fiber/Epoxy Composites. Chinese Journal of Materials Research, 2013, 27(1): 108-112.
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Abstract ABSTRACT Silica sol was prepared by sol-gel method to modify the surface of carbon fiber; the process of spreading for epoxy droplet on parallel carbon fiber sheet was observed; the unidirectional carbon fiber reinforced epoxy resin matrix composites were prepared, and the effect of silica sol modification of carbon fiber on the tensile property of the composites was investigated. The results showed that the wettability of epoxy to the silica sol modified carbon fiber has been improved greatly due to the introduction of polar functional groups such as Si—O—Si and —NH2. The coating of silica sol improved the adhesion between carbon fiber and epoxy, resulting in an increasement of 62.74% of the lateral tensile strength, comparing with that of the unmodified carbon fiber reinforced composites, but little change of the longitudinal tensile strength. Likewise, the lateral tensile strength of composites from carbon fiber pretreated by nitric acid and subsequently modified by silica sol was increased by 35.27%, comparing with composites from pure nitric acid treated carbon fiber.
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