Carboxymethyl cellulose and C-6-carboxy cellulose were treated with SO3 and HSO3CL in DMF yielding the corresponding watersoluble sulfate half-esters. A preferred sulfation of primary hydroxyl groups was found by 13C-n. m.r. spectroscopy. The potentiometric titration of the polyelectrolytes showed significant differences in the titration behaviour which can be explained by the different acidity of the carboxy groups in the two cellulose derivatives.
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Schnabelrauch, M., Heinze, T., Klemm, D. et al. Investigations on synthesis and characterization of carboxy-groups containing cellulose sulfates. Polymer Bulletin 27, 147–153 (1991). https://doi.org/10.1007/BF00296024