Introducing free volume in strongly dipolar polymers to achieve high dielectric constant

Yash Thakur, Minren Lin, Shan Wu, Q. M. Zhang

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    3 Scopus citations

    Abstract

    Advances in modern electronics require the development of polymer-based dielectric materials with high dielectric constant, low dielectric loss, and high thermal stability. Fundamental dielectric theory suggests that strongly dipolar polymers have the potential to realize a high dielectric constant. In order to achieve high thermal stability, these polymers should also possess a high glass transition temperature Tg. However, it has been observed in many dielectric polymers that the dielectric constant decreases markedly at temperatures below Tg due to dipole freezing. This study shows that a high energy density polymer with low loss and high operating temperature can be realized in a family of weakly-coupled strongly-dipolar polymers, such as aromatic urea and thiourea. Our experimental results uncover that disorder (or blending) in these polymers leads to a significantly larger free volume at temperatures far below Tg, thereby enabling easier reorientation of dipoles in response to an electric field. The net result is a substantial enhancement in the dielectric constant while preserving low dielectric loss and very high breakdown field. The results here pave the way for creating high energy density polymers with low loss and high operating temperature.

    Original languageEnglish (US)
    Title of host publication2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2015
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages636-639
    Number of pages4
    ISBN (Electronic)9781467374972
    DOIs
    StatePublished - Dec 9 2015
    EventIEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2015 - Ann Arbor, United States
    Duration: Oct 18 2015Oct 21 2015

    Publication series

    NameAnnual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
    Volume2015-December
    ISSN (Print)0084-9162

    Other

    OtherIEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2015
    CountryUnited States
    CityAnn Arbor
    Period10/18/1510/21/15

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Electrical and Electronic Engineering

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