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  • Title: Dielectric properties of ethyleneglycol-1,4-dioxane mixtures using TDR method.
    Author: Sudo S, Oshiki N, Shinyashiki N, Yagihara S, Kumbharkhane AC, Mehrotra SC.
    Journal: J Phys Chem A; 2007 Apr 26; 111(16):2993-8. PubMed ID: 17402715.
    Abstract:
    Complex permittivity has been determined for mixtures of ethyleneglycol-1,4-dioxane (EG-DX) with various concentrations in the frequency range from 100 MHz to 30 GHz at 25 degrees C by time domain reflectometry (TDR). A primary process with an asymmetric shape and a Debye-type small-amplitude high-frequency process are observed for each mixture. The deviation of the relaxation time for the primary process from that of the ideal mixture shows a maximum value at a mole fraction of 1,4-dioxane, xDX approximately =0.8. The static permittivity for the mixtures can be explained using the Luzar model by assuming the formation of two types of hydrogen-bonded dimers, one between EG-EG (pair 1) and the other between EG-DX (pair 2). The number of these pairs is also estimated as a function of concentration. These results of the relaxation time and static permittivity are interpreted on the basis of a model of two kinds of cooperative domains coexisting in the mixtures.
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