| In this work, diblock copolymer (poly (n-butylacrylate)-co-poly (2-Hydroxyethyl acrylate)-b-poly (glycidyl methacrylate)((PnBA-co-PHEA)-b-PGMA), in which the fexible block PnBA-co-PHEA was a random copolymer chain, was synthesized by atom transfer radical polymerization (ATRP) and then chemically grafted onto the carbon fiber surface. Afterwards, the fexible block was modified to yield photo-cross-linkable segment poly (2-methacryloyloxyethyl acrylate)(PMEA) by chemical reaction of methacryloyl chloride and active hydroxy (-OH) in PHEA. When compounding with epoxy resin, the photo-cross-linkable fexible interlayer was successfully introduced into the interface between carbon fiber and epoxy resin. Microbond test was employed to study the influence of DPn of fexible block, content of PMEA and time of UV radiation on the interfacial shear strength(IFSS). Dynamic mechanical thermal analysis and impact performance test were employed to study the influence of photo-cross-linkable fexible interlayer on the toughness of materials. From the Microbond test, the photo-cross-linkable fexible interlayer greatly improved the interfacial adhesion of carbon fiber/epoxy resin. When the UV radiation time was15min and30min. the IFSS of modified carbon fiber/epoxy resin reached to45.03MPa and49.26MPa. respectively. increasing by28.95%and41.07%compared with that of the oxidated carbon fiber (CF-COOH). Meanwhile, the impact strength value was15.2kJ/m2and5.8kJ/m2. rapidly increasing by235.54%and28.04%respectively. Therefore, it can be concluded that such photo-cross-linkable fexible interlayer can effectively improve the interfacial adhesion and toughness of carbon fiber/epoxy composites. |
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