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Chemically modified celluloses. XIII. Periodate oxidation of cellulose dyed with reactive and direct dyes in the presence of electrolytes
Author(s) -
Shenai V. A.,
Pai K. P.
Publication year - 1979
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1979.070241107
Subject(s) - periodate , sodium periodate , chemistry , reactive dye , cationic polymerization , cellulose , sulfonate , sulfonic acid , polymer chemistry , organic chemistry , sodium , dyeing
Periodate oxidation of cellulose dyed with vinyl sulfone‐type reactive dyes at 32°C in the presence of various concentrations of alkaline earth metal chlorides and a cationic dye‐fixing agent has been studied. The extent of the oxidation has been assessed in terms of rate constant, time of half reaction, and percent accessibility to periodate ions. Remazol Black B was used in the study. This dye on reduction with sodium hydrosulfite after reaction with the fiber removes the sulfonic acid group containing a portion of the dye, leaving behind a portion reacted with the fiber and not containing a sulfonate group. The study has also been extended to a few direct dyes which, unlike reactive dyes, have been shown not to inhibit the rate of periodate oxidation of cellulose.