A proposed novel approach to the study of the dual-mode mechanism of dyeing nylon with acid dyes

• Published in: Journal of applied polymer science Vol. 103; no. 2; pp. 1055 - 1057
• Main Authors: Iijima, T., Petropoulos, J. H.
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 15.01.2007; Wiley
• Subjects: adsorption; Applied sciences; dyes/pigments; Exact sciences and technology; Fibers and threads; Forms of application and semi-finished materials; ion exchangers; modeling; polyamides; Polymer industry, paints, wood; Technology of polymers; dyes/pigments; adsorption; Nylon; Liquid solid adsorption; Synthetic fiber; Adsorption isotherm; Theoretical study; Modeling; Dyeing; Thermodynamic model; polyamides; Formation mechanism; ion exchangers; Acid dye
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.25307

Study of the dual mode mechanism of dyeing nylon with acid dyes, consisting of Langmuir‐type sorption on charged terminal amino groups, accompanied by Nernst‐type uptake, known as “overdyeing,” is subject to complications primarily (but not exclusively) because of structural nonhomogeneity of the polymeric substrate. We present here a system that combines structural simplicity with ease of manipulation of amine content; wherein the nylon substrate is replaced by a liquid phase consisting of a specially selected amine dissolved in a suitable organic solvent. This system displays the characteristic features of the aforementioned dual mode dyeing mechanism, as shown by experimental data of the uptake of C.I. Orange 7 as a function of aqueous dye concentration and amine concentration in the organic phase. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 1055–1057, 2007