INTERFACIAL INTERACTIONS IN CARBON FIBER REINFORCED EPOXY COMPOSITES

摘要

The effect of surface coverage and the type of coupling agent were studied in carbon fiber reinforced epoxy microcomposites. The surface of PAN based, electrochemically oxidized carbon fibers was treated with solutions of an epoxy- (EPS) and an aminosilane (AMS), 4,4'-diphenylmethane diisocyanate (MDI) and triglycidyl isocyanurate (TGIC). The amount of coupling agent bonded chemically to the surface of the fiber was determined by analytical methods. Single fiber composites were prepared from treated and non-treated fibers. The fragmentation method was used to determine the interfacial shear strength (IFSS) characterizing fiber/matrix adhesion. The amount of coupling agent bonded to the fiber surface was related to IFSS. A close correlation was found between the bonded coupling agent and adhesion in the case of the epoxysilane and TGIC, but such a correlation could not be found for the aminosilane and MDI.