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The first approach to non‐aqueous solutions of carboxymethylcellulose
Author(s) -
Heinze Thomas,
Heinze Ute
Publication year - 1997
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.1997.030181206
Subject(s) - aqueous solution , polymer science , materials science , chemical engineering , chemistry , polymer chemistry , organic chemistry , engineering
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.