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Delamination is one of the major concerns for carbon fiber reinforced polymer(CFRP) composites. Improving fracture toughness reduces delamination and allowsfor the creation of multifunctional CFRP. In this study, polyaniline (PANI)coated graphene nanoplatelets (GNP) are introduced in the interlaminar regionof CFRP pre-preg with the aid of environmentally friendly thermoplasticpolymer, polyvinylpyrrolidone (PVP). The GNP content is varied as 1, 3, and 5%by weight with respect to PVP. The improvements in the fracture toughness areinvestigated using a double cantilever beam test. An improvement ofapproximately 79% in mode-I fracture toughness is observed with the addition of5 wt% GNP with respect to PVP. Dynamic mechanical analysis results confirmedthe improvements in storage modulus but showed a decrease in glass transitiontemperature with the addition of nanofiller. Various spectroscopic analysis andimaging techniques were used to understand and evaluate the interactions ofnanocomposites with CFRP pre-preg.

Polyaniline and graphene nanocomposites for enhancing the interlaminar  fracture toughness and thermo-mechanical properties of carbon fiber/epoxy  composites