The Effect of Polycarbonate/Poly(vinylidene fluoride)/Multi-walled Carbon Nanotubes/Carbon Black Composite Co-fillers on the Construction of Conductive Networks and the Electrical Properties of Materials
In order to investigate the effect of conductive fillers on the construction of conductive network and the effect of different types and contents of conductive fillers on the electrical properties of conductive polymer composites(CPCs),multi-walled carbon nanotubes(MWCNTs)and carbon black(CB)were selected as conductive fillers,and polycarbonate(PC)and poly(vinylidene fluoride)(PVDF)were selected as polymer matrix.PC/PVDF blends with double percolation structure were prepared by melt blending.By selective etching of PC,it was found that CPCs with co-continuous structure were formed when the mass ratio of PC/PVDF was 40/60.It was found that MWCNTs and CB fillers were selectively dispersed in the PVDF phase by thermodynamic calculation and SEM observation.The co-continuous structure and selective distribution resulted in the electrical percolation threshold of 0.03 wt％.With the same amount of MWCNTs filler,the electrical properties of CPCs increased with the increase of CB content,because the doped CB played a role in bridging the MWCNTs in the conductive network.At the same time,the distribution of the conductive filler in the matrix was quantitatively analyzed by optical microscope.With the increase of CB content,the co-continuous structure did not change,but the aggregate area of the combined filler showed an increasing trend.
Conductive polymer compositesSelective distributionDouble-percolated structureFiller association
NETL
NSTL
万方数据
维普
