Abstract: Conductive composites based on polypropylene (PP), glass fiber (GF), and conductive carbon black (CB) were prepared via melt extrusion process. The effects of the content of CB and GF on the electrical conductivity, mechanical properties, mould shrinkage, and crystallization behavior of the composites were studied. It showed that the addition of GF promoted the formation of CB conduction network and effectively decreased the percolation threshold. Meanwhile, the addition of GF resulted in a large improvement of stiffness and a remarkable decrease of mold shrinkage of the composites. The addition of CB and GF decreased the crystallization ability of PP.

Key words: glass fiber, conductivity, polypropylene, carbon black, percolation threshold, mechanical property