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Synthesis and structure characterization of 2,3‐ O‐ carboxymethylcellulose
Author(s) -
Heinze Ute,
Heinze Thomas,
Klemm Dieter
Publication year - 1999
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19990401)200:4<896::aid-macp896>3.0.co;2-#
Subject(s) - characterization (materials science) , polymer chemistry , polymer science , chemistry , chemical engineering , materials science , nanotechnology , engineering
2,3‐ O ‐Carboxymethylcellulose (CMC) samples of different degree of substitution (DS) were synthesized via 6‐ O ‐(4‐monomethoxytriphenylmethyl)cellulose under a variety of conditions and with different carboxymethylating agents. The highest DS of carboxymethyl groups of 1.7 was reached with sodium monochloroacetate in dimethyl sulfoxide containing 1% of water as reaction medium. The CMC's dissolve in water starting from a DS of 0.6. In any case, the carboxymethylation is more effective at O ‐2 compared to O ‐3. While samples up to a DS of 1 possess a random distribution of the different repeating units, samples of higher DS show a non‐random structure. Consequently, a control of the distribution of carboxymethyl groups within both the repeating units and the polymer chain was possible for the first time.