Percolation behavior and mehanical properties of polycarbonate composites filled with carbon black/carbon nanotube systems (in English)
Percolation behavior and mehanical properties of polycarbonate composites filled with carbon
black/carbon nanotube systems (in English)
Polimery 2012, No 3, 204
The effect of a mixed filler system consisting of carbon black (CB) and multi-walled carbon nanotubes (MWCNTs) on electrical, rheological and mechanical properties of melt compounded composites with polycarbonate (PC) was investigated. Pure CB or MWCNTs or mixtures of CB and MWCNTs in mass ratio 50/50 or 75/25 were added to PC using a small scale DACA Micro-Compounder in order to get the filler concentration between 0.5 and 5 wt. %. Comparison of the theoretical percolation concentration for composites with the mixed filler systems with corresponding experimental values allows to state that no synergistic effect occurs. SEM and TEM investigations on thin sections showed a good distribution of quite small CB aggregates and good dispersion of the MWCNTs in composites. Rheological properties of the melted composites are more influenced by MWCNTs than by CB content. The stress-strain behavior of the composites compared at loadings leading to a composite conductivity of 10-4 S/cm is the best for composites filled with MWCNTs and better for that with mixed filler systems than for composites with CB only.