The Effect of Silane Coupling Agents with DifferentOrganofunctional Groups on the Interfacial Characteristics ofGlass Fiber-Reinforced Nylon 6 Composites:Microscopic and Macroscopic Approaches

摘要

In this study, the effect of silane coupling agents with different organofunctionalgroups on the interfacial characteristics of glass fiber-reinforced Nylon 6 compositeshas been investigated by means of single fiber microbonding test, short-beam shear test,dynamic mechanical analysis, scanning electron microscopy and thermogravimetric analysis.The results show that the fiber-matrix interfacial characteristics obtained from both microscopicand macroscopic approaches agree well each other. The interfacial shear strength (IFSS) andinterlaminar shear strength (ILSS) of glass fiber/Nylon 6 composites sized with various silanecoupling agents are significantly improved in comparison with those of the composite sizedcommercially. The interfacial properties of the composites increase in order of Z-6076 withchloropropyl groups, Z-6030 with methacrylate groups, Z-6040 with epoxide groups, and Z-6020 with diamine groups in the silanes. The dynamic mechanical properties, the fracturesurface observations and the thermal stability also support the interfacial results. Theimprovement of the interfacial and dynamic mechanical properties may by ascribed to differentchemical reactivities between the reactive amino end groups at Nylon 6 and the organofunctionalgroups located at the end of silane chains, resulting from the increased chemicalreactivity in order of chloropropyl > methacrylate ≈ epoxide > diamine groups.