Abstract
Viscose rayon and oxycellulose containing a high concentration of carboxyl groups have been esterified at the carboxyl group using ethylene oxide. This reagent was chosen to minimize changes in accessibility caused by the esterification reaction. Measurements were made of the carboxyl contents, of the capacities of the samples to absorb water, and of their capacities to absorb the cation and anion from solutions of cetyltrimethylammonium bromide. These last measurements were made to test the hypothesis advanced by Sexsmith and White (1) that absorption of ion pairs from the surfactant solution was a clustering process dependent on the presence of exchanged cations which served as nuclei. The marked decrease in ion-pair absorption found after esterification was in agreement with this hypothesis. Some other properties of the esterified oxycellulose samples are also discussed.
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