Fabrication and Property of Thermally Conductive Composites Composed of Glass Fiber Reinforced Poly (Butylene Terephthalate), Polypropylene and Silicon Carbide

摘要

In this paper, composites composed of glass fiber reinforced poly (butylene terephthalate) (PBT), polypropylene (PP), PP-g-MA and various concentrations of silicon carbide (SiC) were prepared by melt mixing method. SEM images showed that PBT formed continuous phase and PP formed dispersed phase and SiC particles were uniformly dispersed in PBT phase. The PP phase has a space-occupying effect on the whole system, which makes the effective increased concentration of fillers in PBT phase. With enhancement of filler concentration, the inter-particle distance became smaller. When concentration of SIC exceeded 24 wt%, thermal networks were formed and thermal conductivity of the composites increased quickly. At the SIC loading of 40 wt%, the thermal conductivity of composites reached to 1.181 W/mK which is 4 times compared with PBT/PP composites. DSC results showed that incorporation of SIC had effect on melting and crystallinity behavior of PBT phase in the composites. The effects of concentration of fillers on the thermal stability, dielectric property and impact strength were also discussed.