DISSOLVED STATE OF CELLULOSE DIACETATE IN ACETONE

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Abstract
Dissolved state of cellulose diacetate in acetone was studied by means of gel-permeation chromatography (GPC), thin-layer chromatography and infra-red spectroscopy. Four peaks were detected in general in GPC elution curves named from lower count region prehump I, prehump II, mainhump, and posthump, respectively. Prehump I is attributed to the molecular aggregates of cellulose acetate with relatively high acetyl content (57-58%). This is principally equivalent to prehump in tetrahydrofuran found in the previous paper and is largely extractable with good solvents for cellulose triacetate. Prehump II is the molecular aggregates of cellulose diacetate having large molecular weight, which is closely connected with the contents of sodium, calcium and sulfuric acid. Prehump II can be removed by treating the sample with dilute acid solutions. Mainhump is due to the moleculary dispersed particles. The complicated dissolved state of cellulose diacetate in acetone, thus found, is ascribed partly to the distribution of degree of substitution (acetyl content) as well as molecular weight distribution and it is also due in part to the contamination of sodium and calcium as impurity and of sulfuric acid as combined ester in the original polymer.

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