Abstract
Dielectric and water absorption measurements are reported for cellulose acetate, a plasticized cellulose acetate and ethyl cellulose as a function of pressing temperature and pressure. The observed effects are explained on the basis that the work done in producing the discs used in these measurements destroys residual fibre structure and leads to an increase in the dipolar activity of the sample. The observation of gelatinization is discussed in terms of the effects on the side chain mobility and the densification of the polymer matrix. The effects observed in the case of dibutylphthalate are in agreement with data from other measurements on another cellulose derivative and indicate strong interactions between the plasticizer and the polymer. Water absorption data also reflects the changes which occur in the morphology with changes in the pressing conditions.
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