Abstract: Short carbon fiber (SCF) was introduced into blends of maleic anhydride grafted ABS and poly (butylene terephthalate) forming a composite (PBT/ABS-g-MAH/SCF), which was investigated in its phase morphology, mechanical, rheological and crystallization properties by scanning electron microscope (SEM), universal tester, impact tester, rotational rheometer and differential scanning calorimetry (DSC). SEM showed that the interfacial bonding properties between PBT and SCF was better because of epoxy adhesive. The tensile strength, impact strength, and bending strength of the composites reached their maximum with SCF content of about 5 %~10 %. So the SCF had a function of enforcement and toughness for PBT. The rheological behavior showed that complex viscosity reduced firstly and then increased with increasing SCF. In addition, DSC test indicated that SCF component initiated the heterogeneous nucleation, so the crystallization temperature increased when adding appropriate SCF.

Key words: poly (butylene terephthalate）, short carbon fiber, mechanical property, rheology behavior