Abstract: PPS/nano-Si3N4 composites were prepared via melt blending. The tensile and impact properties were significantly enhanced by filling nano-Si3N4.With the addition of 0.8 wt% Si3N4, the tensile strength of the composite was increased by 22 % based on neat PPS. As the content of Si3N4 increased, both un-notched and notched impact strengths each exhibited a maximum at 1.2 wt%, was increased by 33 % and 41 %, respectively, based on neat ones. As Si3N4 powder increased the activation energy of PPS segment relaxation, the storage modulus of PPS/nano-Si3N4 composites reduced, loss modulus increased.

Key words: polyphenylene sulfide, nanometer silicon nitride, nanocomposite, dynamic mechanical properties