Synergic effect in electrical conductivity using a combination of two fillers in PVDF hybrids composites |
| |
Authors: | Aline Bruna da Silva Juliano Marini Genaro Gelves Uttandaraman Sundararaj Rinaldo Gregório Jr Rosario ES Bretas |
| |
Institution: | 1. Department of Materials Engineering, Universidade Federal de São Carlos, Rodovia Washington Luís, Km 235, PO Box 676, São Carlos, SP 13565-905, Brazil;2. Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta T2N 1N4, Canada |
| |
Abstract: | The objective of this work was to prepare novel conductive blends of poly(vinylidene fluoride) (PVDF) with polypyrrole (PPy) and to compare their performance with PVDF/multiwall carbon nanotube (MWCNT) composites and novel PVDF/PPy/MWCNT hybrid systems. All the compositions were prepared by melt mixing using a miniature mixer. The mixtures were characterized by Fourier transformed infrared (FTIR), wide angle X-ray diffraction (WAXD), thermogravimetric analyses (TGA), scanning and transmission electron microscopy (SEM and TEM, respectively) and volume electrical resistivity. For the binary PVDF/PPy and PVDF/MWCNT systems, percolation thresholds of 10 and 0.3 wt%, respectively, were found. In the hybrid systems, however, the percolation threshold for each filler was lower than in the binary systems, but the electrical conductivities were always much higher at all concentrations than the conductivities of the binary systems. Therefore, the addition of both fillers had a synergistic effect on the hybrid system conductivity, which was attributed to its morphology: the PPy increased the homogeneity of the MWCNT distribution and decreased the available free volume for the MWCNT; as a result the MWCNT rolled around the PPy particles bridging them through the PVDF matrix, increasing the quantum tunneling effect and thus, the electrical conductivity of the system. |
| |
Keywords: | PVDF/PPy blends PVDF/PPy/MWCNT hybrid composites PVDF/MWCNT nanocomposites Electrical conductive composites |
本文献已被 ScienceDirect 等数据库收录! |
|