Dyeing behavior of polypropylene blend fiber. I. Kinetic and thermodynamic parameters of the dyeing system

✍ Scribed by Jir̂í Akrman; Josef Pr̂ikryl

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 925 KB
• Volume: 62
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19961003)62:1<235::aid-app27>3.0.co;2-2

✦ Synopsis

An acid dyeable polypropylene fiber has been prepared by admixing a n additive t o 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. T h e dyeing behavior of the physically modified fiber has been characterized by kinetic and thermodynamic parameters. A diffusion coefficient of the order of lo-" m'/s was found, indicating very fast diffusion of the dye molecules within the fiber. T h e measured thermodynamic parameters provide a n insight into molecular interactions that are of prevailing electrostatic nature. T h e results have been explained in terms of the binding of dye molecules to the basic dye sites supplied t o the fiber by a n additive. T h e change of dyeability of modified fiber a t about 70°C is attributable to the glass-rubber transition of the additive. From among the two models of diff'usion considered, the pore model and the free volume model, the first one seems t o be dominant. (cs 1996 John Wiley & Sons, Inc.