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Tailoring dielectric properties of polymer composites by controlling alignment of carbon nanotubes

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Abstract

We prepared hydrogenated butadiene-acrylonitrile (HNBR) elastomer composites with random orientations of carbon nanotubes (CNTs) and aligned CNTs, denoted by random composites and aligned composites, respectively, by means of a simple mechanical blending method. The CNTs were dispersed uniformly in the HNBR matrix in both types of composites. Interestingly, at CNT contents of 1–2.5 vol%, the dielectric loss (tan δ) of the aligned composites increases slightly, and the dielectric constant (ε′) of aligned composites increases largely with the increasing content of CNTs, whereas both the tan δ and the ε′ of the random composites increase largely with the increasing content of CNTs. As a result, a high ε′ (5000 at 1000 Hz) and a low tan δ (0.42 at 1000 Hz) were obtained in the aligned composite with a CNT content of 2.5 vol%, whereas a high ε′ and a high tan δ were obtained in the random composites. The relationship between the microstructure and dielectric properties was qualitatively analyzed by means of the percolation theory and intercluster polarization model. The mechanism for the achievement of high ε′ and low tan δ for dielectric composites was discussed. This study provides a guide to design microstructure that yields composites with improved dielectric properties.

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Acknowledgements

The authors would like to express their sincere thanks to the National Natural Science Foundation of China (Grant Nos. 51173007, 51473011, 51221002), and the Doctoral Science Research Foundation of the Education Ministry of China (Grant No. 20130010110005) for the respective financial supports.

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Authors and Affiliations

  1. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China

    Ming Tian, Liqun Zhang, Yonglai Lu & Nanying Ning

  2. Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China

    Suting Liu, Ming Tian, Liqun Zhang, Yonglai Lu & Nanying Ning

  3. Department of Materials Science and Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061, USA

    Tung W. Chan

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  1. Suting Liu
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  2. Ming Tian
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  3. Liqun Zhang
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  4. Yonglai Lu
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  6. Nanying Ning
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Correspondence to Ming Tian or Nanying Ning.

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Liu, S., Tian, M., Zhang, L. et al. Tailoring dielectric properties of polymer composites by controlling alignment of carbon nanotubes. J Mater Sci 51, 2616–2626 (2016). https://doi.org/10.1007/s10853-015-9575-y

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  • DOI: https://doi.org/10.1007/s10853-015-9575-y

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