Abstract: The interfacial properties of glass fiber composites are the key factors affecting the overall mechanical properties of composites. In this paper, the interfacial bonding strength of glass fiber reinforced thermoplastic resin composites was characterized by peeling test, and the surface characterization was carried out by infrared spectroscopy, contact angle and scanning electron microscopy. The results show that the infrared spectrum of the glass flakes prepared by the laboratory and the glass fiber precursor sizing agent before and after treatment showed that the peaks of the silicon characteristic peaks of the infrared characteristic peaks and the quantitative analysis results were basically the same. The contact angles of the front and back glass sheets are 41.01°and 52.71°, respectively. The surface hydrophobicity is obviously increased, which can be better infiltrated by the resin. The peeling test curve is similar to the debonding tendency of other interface characterization tests, and also conforms to the basic trend of the peeling curve. The average peeling force between the glass sheet and the polyethylene resin before and after the sizing treatment is increased by 84.67%. After the sizing treatment of the surface of the composite material, the adhesion of the interface is significantly increased. Therefore, it is feasible to use the peel test to characterize the interfacial adhesion properties of glass fiber thermoplastic composites.

Key words: glass fiber composite, peel test, interface performance