Abstract
The thermo-dielectric loss measurement is a technique whereby the change of dielectric loss is measured under a definite temperature program. In this method, dielectric loss is determined by the DTA method, since dielectric loss is finally transformed to heat. The contour maps of loss∼logf∼1/T are easily drawn from the DTA curves of polymers and their mixtures.The results obtained from these maps provide new and interesting information about the estimation of polymer compatibility. The compatible pairs poly(vinyl nitrate) (PVN)—poly(vinyl acetate) (PVAc) and PVN—ethylene vinyl acetate copolymer (86-wt% vinyl acetate) (EVAc) are quite different from the incompatible pair PVAc—EVAc in the topographical shape of these contour maps. In these maps, it was found that the maps of compatible and incompatible mixture corresponded well to the maps of random copolymer and of graft copolymer, respectively. And judging by the sharpness of the temperature and frequency dispersion curves of normalized dielectric loss, it was found that even among these compatible pairs, the PVN—PVAc mixture could be presumed more homogeneous than PVN—EVAc mixture.
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Akiyama, S., Komatsu, Y. & Kaneko, R. A New Thermo-Dielectric Loss Measurement for Estimating Polymer Compatibility. Polym J 7, 172–180 (1975). https://doi.org/10.1295/polymj.7.172
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DOI: https://doi.org/10.1295/polymj.7.172
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