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Azide Reactive Dyes
Author(s) -
Griffiths John,
McDarmaid R. Ian
Publication year - 1977
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1977.tb03319.x
Subject(s) - azide , dyeing , chemistry , polymer chemistry , polymer , substrate (aquarium) , aqueous solution , photochemistry , organic chemistry , geology , oceanography
Reactive dyes containing a sulphonylazide group can undergo fixation on nylon substrates by two different mechanisms. Under aqueous dyeing conditions, at or below 120d̀ C, the free amino end‐groups of the polymer attack the sulphonylazide group with displacement of azide ion, and results in attachment of the dye to the substrate by a sulphonamide linkage. In contrast, if the dyed substrate is subjected to dry heat fixation at 170d̀ C, the azide group decomposes to a sulphonylnitrene species which undergoes insertion into C‐H bonds of the polymer. The dye is again attached by a sulphonamide bridge, but in this case the amount of dye that can be fixed is independent of the amino end‐group content of the polymer.