Microwave absorption of water in polymer films in waveguide.

概要

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The effect of chemical structure on the amount of microwave absorption of water in various polymer films at 9.3 GHz was studied. The sample film, which was impregnated with a small amount of water, was placed in a waveguide, and the ratio of the amount of energy transmitted by the sample film to the amount incident was determined. This ratio was defined as the microwave absorption. The microwave absorption was directly proportional to both the volume increase of the sample film due to the water and the amount of water in the polymer. The microwave absorption constant of water in cellulose acetate films having either a hydrophilic or a hydrophobic nature showed the minimum value. The microwave absorptions of systems comprising water dissolved in twenty-one kinds of organic compounds having complete miscibility with water were also measured. The results indicate that the absorption constant decreases when water molecules strongly orient and/or fix the polymer matrix.
公益社団法人高分子学会の論文