Abstract: A novel conductive material——polyacenic semiconductor (PAS) was used as filler instead of carbon black (CB) to prepare polyethylene (PE)/PAS composites. The percolation threshold of PE/PAS composites was confirmed and the mechanism resulting in the phenomenon of percolation threshold was investigated. The room temperature resistivity of the conductive composites was studied from the content of PAS and heat-treatment method. The experimental results showed that the composites were in their percolation threshold,when the mass fraction of PAS was between 20% and 40%,heat-treatment method could make the crystal of PE and conductive chain complete;PE/PAS composites had a high PTC effect;radiation crosslinking could increase PTC effect and decrease NTC effect of composites.

Key words: Polyacenic semiconductor(PAS), Polyethylene(PE), Radiation crosslinking, Positive temperature coefficient(PTC) effect