Enhanced interlaminar fracture toughness of carbon fiber reinforced composites through graphene oxide additions

Delamination is considered a major concern in carbon fiber reinforced composite materials. Modification of laminate surface has been done with nanofillers like clay, carbon nanotubes, and expanded graphite to toughen the interlaminar area and prevent delamination. In this study, an environmentally friendly thermoplastic carrier, polyvinyl pyrrolidone (PVP) and nanoparticles of Graphene oxide (GO) mixtures in pre-determined ratios were incorporated in the interlaminar area of carbon fiber prepregs. The improvement in the interlaminar fracture toughness was determined using a double cantilever beam test protocol. Significant improvements in the mode I fracture toughness of the composites was achieved through the incorporation of PVP-GO mixtures. The molecular level interactions of GO with PVP and the carbon fiber surface is considered important in improving the fracture toughness. Various molecular and imaging spectroscopic techniques were used to understand and evaluate the interactions of nanoparticles with PVP and the carbon fiber. Copyright 2013 by Aurora Flight Sciences.