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High-frequency dielectric and mechanical properties of cyclo-olefin polymer/MgO composites

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Abstract

Variations in the high-frequency dielectric, thermal and mechanical properties of cyclo-olefin polymer (COP)/MgO composites with MgO content were investigated. Dielectric properties were measured using a circular cavity resonance method at approximately 12 GHz and dielectric constants (ε r) were found to increase with increasing MgO concentration. The variations in the observed ε r values were in good agreement with Bruggeman mixing theory, and the dielectric loss (tan δ) values of the composites were consistently in the order of 10−4. It was confirmed that exposure to humid conditions had little effect on the dielectric properties of the composites. The temperature coefficient of the dielectric constant (TCε) and the coefficient of thermal expansion (CTE) were improved as the MgO fraction was increased due to the superior thermal properties of MgO. The mechanical properties of the composites were assessed by Charpy impact and flexural tests. The flexural moduli of the composites increased with higher MgO concentrations in accordance with Nielsen’s theory, while deteriorations in the flexural and impact strengths were observed.

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Acknowledgments

This work was partly supported by the A-STEP program (Adaptable and Seamless Technology Transfer Program through Target-driven R&D), Exploratory Research, FY2012, of the Japan Science and Technology Agency.

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Authors and Affiliations

  1. Graduate School of Science and Technology, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya, 468-8502, Japan

    Susumu Takahashi, Akinori Kan & Hirotaka Ogawa

  2. National Institute of Advanced Industrial Science and Technology (AIST), 2268-98 Anagahora, Shimoshidami, Moriyama-ku, Nagoya, 463-8560, Japan

    Yusuke Imai & Yuji Hotta

Authors
  1. Susumu Takahashi
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  2. Yusuke Imai
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  3. Akinori Kan
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  4. Yuji Hotta
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  5. Hirotaka Ogawa
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Correspondence to Akinori Kan.

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Takahashi, S., Imai, Y., Kan, A. et al. High-frequency dielectric and mechanical properties of cyclo-olefin polymer/MgO composites. Polym. Bull. 72, 1595–1601 (2015). https://doi.org/10.1007/s00289-015-1358-8

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  • DOI: https://doi.org/10.1007/s00289-015-1358-8

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