Nanocomposite of polyrotaxane derivative and graphene with increased dielectric constant
| Autor: | Gao-Qiang Wang, Jingwen Wang, Zhi Jiang, Hua Ren, Shu-Wei Zhou |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Nanocomposite Polymers and Plastics Graphene Composite number Percolation threshold 02 engineering and technology General Chemistry Dielectric 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Nanomaterials law.invention law Materials Chemistry Dielectric loss Composite material 0210 nano-technology High-κ dielectric |
| Zdroj: | Polymer Bulletin. 75:289-306 |
| ISSN: | 1436-2449 0170-0839 |
| DOI: | 10.1007/s00289-017-2038-7 |
| Popis: | Polyrotaxane, owing to the special topological interlocked structure, has attracted more and more attention from researchers. In this paper, a new polyrotaxane derivative has been synthesized based on the polyrotaxane end capped by 2, 4-dinitrofluorobenzene (DNFB). And through cross-linking the polyrotaxane derivative meanwhile adding graphene filler, high dielectric constant elastomeric nanocomposite is fabricated according to percolation theory. SEM images show that the addition of polyvinylpyrrolidone (PVP) improves the dispersibility of graphene in the cross-linked matrix. The percolation threshold of composite with PVP-modified graphene is 2.45 vol.% and for unmodified composite it is 2.20 vol.%. Besides, the dielectric constant of composite with PVP-modified graphene increases sharply to 289.8 with graphene content of 2.35 vol.% which is 25 times higher than that of matrix. However, the dielectric loss of composite is just 0.46. What is more, the thermal stability of composites shows an obvious enhancement compared to the polymer matrix. And the composite films still exhibit great flexibility at room temperature. |
| Databáze: | OpenAIRE |
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