Abstract: High effective nucleating masterbatch was prepared by melt intercalation approach, and its effect on the properties of glass fiber reinforced PET composites was investigated. When the content of nucleating masterbatch was 6 wt %, the initiative crystallization temperature and crystallization range of the composite increased 24.8 ℃ and 66.3 ℃ compared to the neat PET, respectively. The addition of masterbatch essentially diminished the cooling crystallization and made it possible for the molding was carried out at a mold temperature of 70 ℃. The effect of screw combination on the properties of fiber reinforced PET composites was also studied. It was found that if the shearing stress was too high the impact strength of composites would decline. Base on the optimized screw combination, the fiber reinforced PET composites with excellent comprehensive properties was prepared, the heat distortion temperature reached 228 ℃, the tensile, flexural, and impact strengths obtained were 159 MPa, 235 MPa, and 101 J/m, respectively.

Key words: reinforcement, glass fiber, poly(ethylene terephthalate), nucleating masterbatch, composite, screw combination