Interfacial adhesion of carbon fiber to special engineering plastics: Effect of the functional groups in the matrix

Abstract

We studied the interfacial shear strength (IFSS) in carbon fiber (CF) and special engineering plastics matrix, with an emphasis on the effect of the functional group in the matrix. The IFSS was analyzed to quantify the interfacial adhesion between the fiber and the matrix. To obtain the apparent IFSS of the composites, microdroplet test was measured at single-fiber composites. Results of the microdroplet test displayed that the apparent IFSS in the composites was directly determined by their inherent surface properties and the functional groups in the matrix. Compared with other matrices, polyetherimide (PEI) exhibited relatively strong mechanical bonding and interfacial adhesion, showing that the imide groups had good interfacial compatibility with the pristine CF surface. Based on the results of this study, polymers containing imide groups were one of the best candidates for sizing agent of CF used as reinforcement of high-temperature thermoplastics.

The Influence of Fiber Treatment and Matrix Type on the Impregnation Quality of Carbon Fiber Reinforced Thermoplastics

“…PC thermoplastic matrix and silane coupling agent treatment can increase interfacial shear strength because the polarity strength of the interface increases due to silane interaction on the fiber surface pushing chemical bonds at the interface to get effective increases (Shao et al, 2017). The combination of polycarbonate matrix and silane coupling agent fiber treatment can increase IFSS due to chemical reactions at the interface because of silane coupling agent treatment (Wang et al, 2021).…”