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The first approach to non-aqueous solutions of carboxymethylcellulose

✍ Scribed by Thomas Heinze; Ute Heinze

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
424 KB
Volume
18
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

Formic acid was found to dissolve sodium carboxymethylcellulose (Na‐CMC) with comparatively slight chain degradation. The dissolution of Na‐CMC in a wide range of degree of substitution from 0.4 to 2.0 occurs under partial formylation of the remaining OH groups of the polymer, i.e., formic acid is the first non‐aqueous, so‐called derivatizing solvent. The Na‐CMC formyl esters, which can be isolated under water‐free conditions, are even soluble in dipolar‐aprotic solvents, and they can be regenerated to Na‐CMC by treating with aqueous solutions of NaOH.

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