Abstract
The surface properties of cellulose ester films were determined by means of contact angle measurements and atomic force microscopy. Films of cellulose acetate, cellulose acetate propionate, cellulose acetate butyrate, carboxymethyl cellulose acetate butyrate, and cellulose acetate phthalate were obtained by adsorption or spin coating onto silicon wafers. The surface energy of the films was indirectly determined by contact angle measurements using drops of water, formamide, and diiodomethane. The surface energy decreased as the size of alkyl ester group or degree of esterification increased, because van der Waals interactions became weaker. Hamaker constant values were calculated for the cellulose ester films, which allow predicting film stability.
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