Non-ionic cellulose esters were synthesized in homogeneous phase (N,N-dimethyl acetamide/LiCl) with mixed oxacarbonic acid/p-toluenesulfonic acid anhydrides. This effective synthetic method yields the pure carboxylic acid esters within the wide range of the degree of substitution (DS) from 0.4 to 3.0. The polymers were characterized by means of FTIR and 13C NMR spectroscopy as well as by means of 1H NMR spectroscopy of the additionally peracetylated samples. The polymers are water soluble starting with a DS of 0.4 and they are even soluble in acetone and ethanol at higher DS values. They are thermally stable up to 325°C.
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Heinze et al. (2000) studied this question.
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