W. Wagenknecht et al., STUDIES ON SULFATION OF PARTIALLY SUBSTITUTED CELLULOSE-ACETATE UNDERHOMOGENEOUS REACTION CONDITIONS, Cellulose Chemistry and Technology, 25(5-6), 1991, pp. 343-354
This contribution summarizes our results on the homogeneous sulphation
of commercial cellulose acetates (DS approximately 2 and 2.5, resp.)
with different acylation agents in dimethylformamide as the reaction m
edium. After deacetylation with NaOH in ethanol, water-soluble Na-cell
ulose sulphates were generally obtained at a DS of sulphate half ester
groups exceeding 0.25. The acylation agent employed (SO3, ClSO3H, Ole
um, SO2Cl2, H2NSO3H and CH3COSO4H) was of influence mainly on the reag
ent yield and product viscosity. The maximum DS of sulphate half ester
groups is limited by the amount of free cellulose OH-groups, obviousl
y no transesterification of acetyl groups occurring.