Preparation of Long Glass Fiber Reinforced PBT Composites with Chemical Bonding Interphase

摘要

Long glass fiber reinforced PBT composites (LGF/PBT) were prepared by a novel process, in which reinforcing continuous glass fiber was impregnated by melting PBT oligomer, and cutting into 6mm long pellets after cooling. Then the pellets were insitu polymerized in solid state to improve the molecular weight of PBT. The grafting reaction of PBT macromolecular chain on the surface of reinforcing glass fiber took place during the insitu solid-state polycondensation (SSP). The reinforcing glass fiber after removing ungrafted PBT was investigated by scanning electron microscopy (SEM), differential scanning calorimetric (DSC). The information of these testing techniques gave a series of evidence to prove the presence of grafted PBT layer on the surface of glass fiber treated with silane coupling agent.