Abstract
A semiempirical equation readily applicable to analysis of volume retardation curves is derived from the Bueche theory. The equation is applied to experimental results on polystyrene obtained over a temperature range from the upper limit of the glass transition region, Tg+, to 60 degrees below. It is shown that the equation satisfactorily describes the behavior of experimental isotherms. Values of equilibrium volume, diffusion coefficient, and free volume fraction are determined at the temperatures in the above range. In the glass transition region, from Tg+ to Tg−, temperature dependence of these quantities is consistent with that predicted from the free volume theory. Below Tg−, however, the temperature dependence seems to deviate from the extrapolation of the above.A semiempirical equation for an anomalous isotherm, which has a maximum, is similarly derived and applied to the analysis of the experimental results. The experimental isotherms are fairly well interpreted in terms of the equation.
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Part of this work was presented in a talk at the 13th meeting of the Japan Society of Applied Physics and the 21st Annual Meeting of the Physical Society of Japan, Tokyo, April, 1966.
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Hozumi, S. Volume Retardation of Polystyrene. II. Polym J 2, 756–767 (1971). https://doi.org/10.1295/polymj.2.756
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DOI: https://doi.org/10.1295/polymj.2.756