The relationship between the dielectric constant and water‐vapor accessibility of cellulose

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Abstract
The relationship between the water‐vapor accessibility of cellulose and its dielectric constant at 10,000 cycles per second and 30°C. has been examined. Six different celluloses were studied. These included a cotton linters, a hydrolyzed cellulose, two regenerated celluloses, and two bleached wood pulps. In the accessibility range between 35 and 85%, the relationship appears to be very nearly linear. The maximum deviation of the experimental dielectric constant values from the least squares regression line is 0.1. Extrapolation of this relationship indicates that the dielectric constant of accessible cellulose is about 9, while that of inaccessible cellulose is about 4. The dielectric constant of the cellulose can then be thought of as that of a two‐component system, one component the accessible fraction and the other the inaccessible fraction. A slight increase in the dielectric constant of cellulose was brought about by drying the cellulose by a solvent replacement method rather than from water. This increase could be explained by density changes in the cellulose.

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