Preparation and Properties of Polyvinylidene Fluoride/Expanded Graphite High Dielectric Composites
GUO Huachao1, DENG Wei2, YANG Bo1, HUANG Guojia1, LI Shuang1, WEN Fang1
1 Guangzhou Special Pressure Equipment Inspection and Research Institute, Guangzhou 510663 2 School of Material Science and Engineering, Harbin University of Science and Technology, Harbin 150040
Abstract: The polyvinylidene fluoride/expanded graphite (PVDF/EG) composites were prepared by solution mixing, and the effects of EG content on the microstructure, electrical, mechanical and thermal stability of the composites were studied. The results show that the addition of expan-ded graphite (EG) greatly reduce the volume resistivity (ρv), improve the dielectric constant (εr) and the dielectric loss (tanδ) of the compo-sites, and the percolation threshold in PVDF/EG composites is about 4wt%. The ρv is 11 orders of magnitude smaller than that of pure polyvinylidene fluoride (PVDF) when the EG content is 5wt%, and εr is increased by about 68.75 times to 550. With the addition of EG, the tensile strength and Young modulus of the composites increase firstly and then decrease, reaching the maximum value of 58.31 MPa and 910.09 MPa respectively when the content of EG is 5wt%, which is increased by 27.76% and 70.10% in comparison with pure PVDF. While the elongation at break of the composites decrease gradually with the addition of EG. Furthermore, thermal stability of the composites is obviously improved when EG content is low, the decomposition temperature of 5% weight loss of PVDF/EG(4wt%) composites is 5.90 ℃ higher than that of PVDF.
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