Dielectric properties of the free water in hydroxypropyl cellulose.

Seiichi Sudo

Department of Physics, Tokyo City University, Tamazutsumi, Setagaya, Tokyo 158-8557, Japan. sudo@ph.ns.tcu.ac.jp

The journal of physical chemistry. B 2011 Jan 13

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We performed dielectric measurements of aqueous solutions of hydroxypropyl cellulose (HPC) with various concentrations in the temperature range between 25 °C and -20 °C. A primary relaxation process due to the motion of free water restricted by HPC molecules is observed at GHz region. The relaxation time and shape parameter of the primary process strongly depend on the concentration of HPC. The change of the dielectric relaxation parameters is interpreted by the results of the formation of a cholesteric phase structure of the HPC molecules.