Abstract: Polyethylene/Stannum (PE/Sn) conductive composites were prepared via high temperature extrusion and stretching-low temperature injection process. The effect of pelletizer speed (that is stretching speed) and content of Sn on the microstructure, electrical conductivity and mechanical properties were studied. Results showed that when the pelletizer speed increased from 35 r/min to 50 r/min, the stannum dispersed phase was stretched into smaller and longer fibers in the PE matrix, the content of Sn that induced electrical conductivity decreased from 9.2 % to 6.2 %, which means the percolation threshold of the PE/Sn composites decreased, and the mechanical properties of the composites increased.

Key words: stannum, composite, streching speed, electrical conductivity, polyethylene