POLYMERS AND POLYMER MATRIX COMPOSITES |
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Preparation and Properties of Polyvinylidene Fluoride/Expanded Graphite High Dielectric Composites |
GUO Huachao1, DENG Wei2, YANG Bo1, HUANG Guojia1, LI Shuang1, WEN Fang1
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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 |
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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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Published: 29 August 2019
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About author:: Huachao Guois currently a assistant engineer senior in Guangzhou Special Pressure Equipment Inspection and Research Institute, Guangzhou, China. She got her master degree of Engineering in Materials Science. Her research area is polymer matrix composites. At present, she has published 3 papers indexed by SCI, 2 papers indexed by EI and 2 papers in Chinese Core Journal. Besides, she has 3 patents for utility models which all authorized by State Intellectual Property Office. She is responsible for one project of the Guangzhou Market Supervision and Administration Bureau.Bo Yangis currently a senior engineer in Guangzhou Special Pressure Equipment Inspection and Research Institute, Guangzhou, China. He obtained his Ph.D. degree in thermal engineering from Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences. His research interests focus on the new materials for thermal management, safety of special equipment, ene-rgy saving and systematic risk analysis. He has published more than 30 journal papers in international and domestic journals, among them 8 papers indexed by SCI at present. Furthermore, 14 patents were authorized as the first inventor, including 2 patents granted by the Uni-ted States, 5 patents granted by the State for invention and 8 patents granted for utility models. He drafted 4 national and provincial standards. In addition, he completed 4 projects of the General Administration of Quality Supervision, Inspection and Quarantine, Department of Science and Technology of Guangdong Province and so on.Guojia Huangis currently a senior engineer in Guangzhou Special Pressure Equipment Inspection and Research Institute, Guangzhou, China. He obtained his Ph.D. degree in Material physics and chemistry from Sun Yat-sen University, Guangzhou, China in 2015. His research interests are the synthesis and application of nanomaterials and polymers. He has published more than 10 research articles as the first author or correspondence author in reputed international journals and applied 5 national invention patents. In addition, he is also a reviewer of some academic journals such as Journal of Applied Polymer Science. |
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