Dielectric properties of an epoxy-amine system at a high microwave frequency

Liming Zong, Shuangjie Zhou, Nikki Sgriccia, Martin C. Hawley, Rensheng Sun, Leo C. Kempel

    Research output: Contribution to journalArticle

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    Abstract

    The dielectric properties of a curing diglycidyl ether of bisphenol A (DGEBA)/Jeffamine D-230 system have been studied over the temperature range of 20-90°C at 2.45 GHz. It was found that, generally, both the dielectric constant and the dielectric loss factor of the system increased with temperature and decreased as the reaction proceeded. The epoxy resins at different extents of cure exhibited the γ relaxation, which can be described by the Arrhenius Rate Law. The relaxation is attributed to the motions of the dipolar groups associated with the reactants. The Davidson-Cole model can represent the temperature dependencies of the dielectric properties. The nature of the information yielded by dielectrometry on the dynamics of the system is discussed. The evolution of the parameters of the models during the polymerization was mainly affected by the decreasing number of the dipolar groups involved in the reaction and increasing medium viscosity.

    Original languageEnglish (US)
    Pages (from-to)1576-1580
    Number of pages5
    JournalPolymer Engineering and Science
    Volume45
    Issue number12
    DOIs
    StatePublished - Dec 2005

    Profile

    Acetanilides
    Dielectric properties
    Temperature
    Anthralin
    N-Acetylmuramoyl-L-alanine Amidase
    Aldrin
    Artificial Heart
    Spontaneous Fractures
    Dielectric losses
    Permittivity
    Polymerization
    Microwave frequencies
    Epoxy resins
    Curing
    Amines
    Ethers
    Viscosity

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Polymers and Plastics
    • Materials Chemistry

    Cite this

    Dielectric properties of an epoxy-amine system at a high microwave frequency. / Zong, Liming; Zhou, Shuangjie; Sgriccia, Nikki; Hawley, Martin C.; Sun, Rensheng; Kempel, Leo C.

    In: Polymer Engineering and Science, Vol. 45, No. 12, 12.2005, p. 1576-1580.

    Research output: Contribution to journalArticle

    Zong, Liming; Zhou, Shuangjie; Sgriccia, Nikki; Hawley, Martin C.; Sun, Rensheng; Kempel, Leo C. / Dielectric properties of an epoxy-amine system at a high microwave frequency.

    In: Polymer Engineering and Science, Vol. 45, No. 12, 12.2005, p. 1576-1580.

    Research output: Contribution to journalArticle

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    abstract = "The dielectric properties of a curing diglycidyl ether of bisphenol A (DGEBA)/Jeffamine D-230 system have been studied over the temperature range of 20-90°C at 2.45 GHz. It was found that, generally, both the dielectric constant and the dielectric loss factor of the system increased with temperature and decreased as the reaction proceeded. The epoxy resins at different extents of cure exhibited the γ relaxation, which can be described by the Arrhenius Rate Law. The relaxation is attributed to the motions of the dipolar groups associated with the reactants. The Davidson-Cole model can represent the temperature dependencies of the dielectric properties. The nature of the information yielded by dielectrometry on the dynamics of the system is discussed. The evolution of the parameters of the models during the polymerization was mainly affected by the decreasing number of the dipolar groups involved in the reaction and increasing medium viscosity.",
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    AU - Kempel,Leo C.

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