| Summary: | 碩士 === 大同大學 === 材料工程學系(所) === 102 === Carbon fibers (CFs) are widely used in our life due to their light weight and excellent mechanical properties. However, the weak interface shear strength (IFSS) in the CF fabric (CFF) reinforced laminated composite is one of the drawbacks for failure. Some researchers enhanced IFSS and composite strength by adding carbon nanotubes (CNTs).
In this experiment, CNTs and aqueous solution of surfactant (NaDDBS, SDS, PEI) were mixed with a fixed weight ratio and then electrophoretic deposition was used to deposit CNTs on the CFF at different voltages. The CNT distribution in the CFFs was observed by FE-SEM. After electrophoretic deposition, the CNT/CFF/epoxy three-phase composites were prepared by hand lay-up technique. Three-point bending test and short beam test were used to compare the differences in flexural strength and IFSS at different electrophoretic conditions. The experimental results showed that the strength of the composite in NaDDBS system and SDS system was lower than the strength of the original composite, and the strength of the composite in PEI system was increased by about 35%. The single fiber tensile testing and TGA test were performed to further clarify the reason for the lower composite strength in NaDDBS system and SDS system. The strength of fiber was damaged in NaDDBS system and SDS system during electrophoretic deposition. The measurement results of short beam test indicated that the IFSS in PEI system was increased by about 7%.
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