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Nanocomposite of polyrotaxane derivative and graphene with increased dielectric constant

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Abstract

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.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 21174063), the Natural Science Foundation of Jiangsu Province (No. BK20131358), the Aeronautical Science Foundation of China (Nos. 2011ZF52063 and 2014ZF52069), and A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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Correspondence to Jing-Wen Wang.

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Zhou, SW., Wang, JW., Wang, GQ. et al. Nanocomposite of polyrotaxane derivative and graphene with increased dielectric constant. Polym. Bull. 75, 289–306 (2018). https://doi.org/10.1007/s00289-017-2038-7

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  • DOI: https://doi.org/10.1007/s00289-017-2038-7

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