Abstract
The contributions of water occluded in polymeric media to dielectric relaxation were examined in detail on hydrophobic polymer specimens exposed to 18.7 torr humidity (78.6% relative humidity) at 25°C. The polymers examined were polyethylenes, oxidized polyethylenes, polystyrene, poly(styrene-co-acrylonitrile), poly(methyl methacrylate), and poly(vinyl acetate). In these polymers, except for the polyethylenes, the dielectric water relaxation peak usually appeared in a temperature range around 200 K (at 1 kHz) with an activation energy of about 40 to 50 kJ mol−1. The magnitude of dielectric dispersion due to water was calculated by the Onsager equation, assuming that occluded water molecules can rotate freely. The calculated values are about twice as large as the observed values for each system. This implies that the motion of water molecules is subject to certain hindrances from the polymeric media. In polyethylenes, especially in oxidized polyethylenes, the behavior of water molecules was markedly different from that in other polymers. Low- and medium-density polyethylenes absorbed virtually no water, while high-density polyethylene and oxidized polyethylenes absorbed a little. These polyethylenes exhibited two loss peaks at about 230 and 270K with the activation energies of about 120 and 316 kJ mol−1, respectively.
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Suzuki, T., Adachi, K. & Kotaka, T. Dielectric Relaxations of Water Molecules Occluded in Polymeric Media: Some Hydrophobic Polymer Systems. Polym J 13, 385–397 (1981). https://doi.org/10.1295/polymj.13.385
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DOI: https://doi.org/10.1295/polymj.13.385
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