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Dyeing behavior of polypropylene blend fiber. I. Kinetic and thermodynamic parameters of the dyeing system
Author(s) -
Akrman Jir̂í,
Pr̂ikryl Josef
Publication year - 1996
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/(sici)1097-4628(19961003)62:1<235::aid-app27>3.0.co;2-2
Subject(s) - dyeing , fiber , diffusion , polypropylene , polymer , materials science , polymer chemistry , alkyl , acid dye , molecule , synthetic fiber , extrusion , chemical engineering , kinetic energy , glass transition , disperse dye , composite material , thermodynamics , chemistry , organic chemistry , physics , quantum mechanics , engineering
An acid dyeable polypropylene fiber has been prepared by admixing an additive to the polymer prior to extrusion. An additive has been synthesized by attaching long alkyl chains together with substituents carrying basic nitrogen to a rigid polymer backbone. The dyeing behavior of the physically modified fiber has been characterized by kinetic and thermodynamic parameters. A diffusion coefficient of the order of 10 −11 m 2 /s was found, indicating very fast diffusion of the dye molecules within the fiber. The measured thermodynamic parameters provide an insight into molecular interactions that are of prevailing electrostatic nature. The results have been explained in terms of the binding of dye molecules to the basic dye sites supplied to the fiber by an additive. The change of dyeability of modified fiber at about 70°C is attributable to the glass‐rubber transition of the additive. From among the two models of diffusion considered, the pore model and the free volume model, the first one seems to be dominant. © 1996 John Wiley & Sons, Inc.