Electrical characteristics of fluorinated carbon black-filled poly(vinylidene fluoride) composites

Dispersion and electrical properties of fluorinated carbon black-filled pol y(vinylidene fluoride) (PVDF) composites were studied as a function of the fluorine content. It was found that with increasing the fluorine content ca rbon particles tend to stick together to form large aggregates. The percola tion concentration increases to a high concentration, whereas the percolati on process becomes gradual. The temperature dependence of resistivity measu rements show that the fluorinated carbon black-filled PVDF composites exhib it a high PTC intensity and a low NTC effect. These phenomena were discusse d in terms of thermodynamic interactions between fluorinated carbon and the PVDF matrix. The dielectric behavior was also investigated in this study. (C) 2001 John Wiley & Sons, Inc.