Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5022283 | Composites Science and Technology | 2017 | 23 Pages |
Abstract
Graphene (GR)/acrylic polyurethane (APU) composites with low percolation threshold and tunable negative permittivity were prepared by coating and pressing method. The microstructures and dielectric properties including alternating current conductivity (Ïac), reactance (Zâ³) and permittivity (Éâ² and Éâ³) were investigated in detail. A percolation phenomenon from Ïac was observed when the GR content was increased from 0.9 to 6Â vol%, and the percolation threshold was 1.8Â vol%. The percolation threshold was obviously lower than those from the reported carbon/silicon nitride, carbon nanotube/phenolic resin and GR/phenolic resin composites, which was possibly attributed to the well dispersion and unique microstructure of GR in APU. Moreover, the negative permittivity was obtained from the much lower GR content (only 3Â vol%) than the previously reported composites. In addition, compared with other composites with negative permittivity, the dielectric loss (Éâ³) from the GR/APU composites was obviously reduced.
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Engineering (General)
Authors
Haikun Wu, Yuanyuan Qi, Zhongyang Wang, Wen Zhao, Xiaomin Li, Lei Qian,