Cardo poly(ether sulfone)toughened E51/DETDA epoxy resin and its carbon fiber composites
A toughener that can effectively improve the interlaminar toughness in carbon fiber composites is crucial for various applications.We investigated,the toughening effects of phenolphthalein-based cardo poly(ether sulfone)(PES-C)on E51/DETDA epoxy and its carbon fiber composites(CFCs).Scanning electron microscopy showed that the phase structures of PES-C/epoxy blends change from island(of dispersed phase)structures to bi-continuous structures(of the matrix)as the PES-C content increased,which is associated with reaction-induced phase separation.After adding 15 phr PES-C,the glass transition temperature(Tg)of the blends increased by 51.5 ℃,and the flexural strength,impact strength and fracture toughness of the blends were improved by 41.1％,186.2％and 42.7％,respectively.These improvements could be attributed to the phase separation structure of the PES-C/epoxy sys-tem.A PES-C film was used to improve the mode-Ⅱ fracture toughness(GⅡC)of CFCs.The GⅡC value of the 7 μm PES-C film toughened laminate was improved by 80.3％compared to that of the control laminate.The increase in GⅡC was attributed to cohesive failure and plastic deformation in the interleaving region.
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