Preparation and properties of continuous glass fiber reinforced anionic polyamide-6 composites via in situ anionic ring-opening polymerization

Continuous glass fiber (GF) reinforced anionic polyamide-6 (APA6) composites were prepared via in situ anionic ring-opening polymerization.The effects of catalyst ratio and polymerization temperature on the conversion and molecular weight of APA6 resin were studied.The effects of polymerization temperature and time on the degree of crystallinity of continuous GF/APA6 composites were investigated using DSC and TGA, and the effects of polymerization temperature and time on mechanical properties of continuous GF/APA6 composites were further discussed.The morphologies of tensile fracture surfaces of continuous GF/APA6 composites were observed by SEM.Results show that, when the polymerization temperature is 150 ℃ and the polymerization time is 45 min, the continuous GF/APA6 composites reach the highest values of mechanical properties, which the tensile strength is 538.1 MPa, bending strength is 497.2 MPa and interlaminar shear strength is 52.5 MPa.The SEM analysis shows that there is a good bonding quality between the glass fiber and APA6 resin matrix.