Further Studies on Cotton Cellulose with Reduced Crystallinity

Abstract

Further studies have been made of the variables in the application of anhydrous ethylamine to cotton cellulose. The crystallinity of the product has been estimated by means of the acid- hydrolysis residue method. Indication of crystallite length has been obtained by the use of the "leveling-off" degree of polymerization. Reduction of crystallinity has been shown to take place rapidly and to be independent of the degree of polymerization of the cellulose. The maxi mum reduction in crystallinity was found to occur in material that was free of tension. Crystal lite orientation was essentially unaffected by the treatment. The cellulose II pattern was always found in the cellulose after contact with mercerizing caustic, regardless of the sequence of treat ment. A crystallite length of 150 anhydroglucose units seems to be a more stable structure after amine treatment than that of 225 units, which is usually found in native cotton.

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