Journal
APPLIED SURFACE SCIENCE
Volume 293, Issue -, Pages 177-186Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2013.12.126
Keywords
Dielectric barrier discharge (DBD); Dyeing mechanism; Direct dye; Surface characterization; Plasma; Polyamide; Nylon; XPS
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Funding
- Fundacdo para a Ciencia e Tecnologia, Portugal [SFRH/BD/65254/2009]
- Programa Compromisso para a Ciencia, Portugal [C2011-UMINHO-2C2T-01]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/65254/2009] Funding Source: FCT
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The physico-chemical improvements occasioned by DBD plasma discharge in dyeing process of polyamide 6,6 (PA66) fibers were investigated. The SEM, fluorescence microscopy, UV-vis spectroscopy, surface energy, FUR, XPS and pH of aqueous extracts confirm the high polar functionalization of PA66 fibers due to plasma incorporation of oxygen atoms from atmospheric air. DBD plasma-generated reactive species preferentially break the C N bonds, and not the aliphatic C-C chain of PA66. Formation of low-molecular weight acidic molecules that act as dye carrier and creation of micro-channels onto PA66 surface seems to favor dye diffusion into the fiber cores. Plasma treatment allows high level of direct dye diffusion and fixation in PA66 fibers at lower temperatures and shorter dyeing times than traditional dyeing methods. (C) 2013 Elsevier B.V. All rights reserved.
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