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Reaction and diffusion of reactive disperse dye in nylon 6
Author(s) -
Morita Zenzo,
Saito Takayuki,
Motomura Hiromi
Publication year - 1986
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.1986.070320312
Subject(s) - diffusion , reaction rate constant , dyeing , nylon 6 , reactive dye , chemistry , dissociation (chemistry) , dissociation constant , disperse dye , reaction rate , substrate (aquarium) , polymer chemistry , chemical reaction , kinetics , organic chemistry , thermodynamics , polymer , biochemistry , physics , receptor , oceanography , quantum mechanics , catalysis , geology
The diffusion of a reactive disperse dye with a vinylsulfonyl group accompanied by simultaneous reaction with the amino end groups in nylon 6 was examined by the method of cylindrical film roll at 70°C and pH 2.2–8.0. The experimental diffusion profiles of the active and fixed species of the dye in nylon 6 were confirmed to be described by the diffusion equation accompanied by the chemical reaction with substrate taking the limited amount of the end groups into account, where the active species of dye were assumed to react only with the free base of amino end groups. The completion of the reaction with the amino end groups was observed in the first layer from the surface at pH 6.0–8.0. The value of diffusion coefficient was constant (8.0 × 10 −10 cm 2 /s) at all the pH's. The product of the second‐order rate constant, k 2 , of reaction of the dye and the dissociation constant, K a , of the amino end groups was constant ( k 2 K a = 4.0 × 10 −9 s −1 ) at pH 2.2–8.0. The k 2 values of the reaction with various substrates for vinylsulfonyl and monochlorotriazinyl‐reactive dyes were compared and the practical dyeing conditions were discussed.