The influence of molecular weight of acid dyes on the yield stress of dyed nylon monofilament

• Published in: Journal of applied polymer science 1984-11, Vol.29 (11), p.3241-3252
• Main Authors: Suganuma, Keiko, Kuno, Hiroshi
• Format: Article
• Language: English
• Subjects: Applied sciences; Exact sciences and technology; Fibers and threads; Forms of application and semi-finished materials; Polymer industry, paints, wood; Technology of polymers
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.1984.070291103

The yield stress of nylon filament dyed with several acid dyes has been determined as a function of dye content and the molecular weight of acid dyes. The nylon filament dyes with acid dye has greater yield stress than undyed one. The relation between the increment of the yield stress (f) due to the adsorption of acid dye and the dye content (C) in the filament can be expressed by parameters A and B as log f = A log(C − C) + B, where C0 is the dye content under which no contribution to the yield stress is observed and C0 depends on the number of sulfonic groups in acid dye. It is found that these parameters A and B are expressed by M (the difference between the molecular weight of acid dye and the weight of SO3Na groups in it) as A = 1 − 100/M, B = k1 Mk2, where k1 and k2 are the constants which depend on the parent chemical structure of dyes. The parameters A and B are expected to give available informations as to the physical state of adsorbed dye on nylon filament.