Effect of low‐temperature plasma and chitosan treatment on wool dyeing with Acid Red 27

Abstract

This study examines in detail the influence of low-temperature plasma and biopolymer chitosan treatments on wool dyeability. Wool knitted fabrics were treated and characterized by whiteness and shrink-resistance measurements. Surface modification was assessed by contactangle measurements of human hair fibers, which were used as a model to study the wetting properties of the treated wool knitted fabrics. The dyeing behavior was assessed from the diffusion mechanism point of view. The dyeing kinetics were measured at two different pHs (4.2 and 6.5) and three different temperatures (60, 85, and 100°C) to gain information about the contribution of the surface modification treatment to the dyeing mechanism. The exhaustion and reflectance data were compared, and the apparent diffusion coefficients were calculated. On the basis of the obtained results, a model for the dyeing mechanism of the chitosan treated wool was proposed. When treated with chitosan, the polymer sheath spread on the surface of the fibers acted as a predominant dyeing site in very short dyeing times, thus interacting with the dye and in later stages imparting the dye to the wool fiber.

Effect of wetting pretreatment on structure and properties of plasma induced chitosan grafted wool fabric

“…In the case of PICS-grafted samples, the K/S values increased due to the availability of extra amine and hydroxyl groups, which were provided by CS molecules [28,33].…”

Chemical and physical analysis of cotton fabrics plasma-treated with a low pressure DC glow discharge

“…Non-thermal plasmas are able to alter the physico-chemical properties of a polymer surface: the main effects of interaction between active plasma species and polymeric surfaces is breaking polymer molecular chains, inducing new functional groups and altering morphological properties (Caiazzo et al 1996;Keil et al 1998;Toufik et al 2002). Some of the possible effects include improved hydrophilic properties (De Geyter et al 2006;Pandiyaraj and Selvarajan 2008;Vesel et al 2008), an improved adhesion to coatings and to polymer matrices (Liston 1989;Liston et al 1993;Dumitrascu and Borcia 2006;Zhang et al 2009), an improved dye ability (Jocic et al 2005;Ren et al 2008), induced hydrophobic properties (Hodak et al 2008;Leroux et al 2008), …. Apart from creating interesting textile properties, plasma processing is a rapid and environmentally friendly technique producing virtually no waste (Verschuren et al 2007;Yip et al 2002).…”

The effect of an innovative atmospheric plasma jet treatment on physical and mechanical properties of wool fabrics

“…The application of LTP technologies on wool was extensively studied (Rakowski, 1991;Sadova, 2006;Thomas, 2007); researches mostly dealt with improving finishing performance of wool such as printing (Ryu et al, 1991) and dyeing (Jocic et al, 2005;Kan, 2006;Masakuni and Inagaki, 2006;Shin et al, 1999), strictly related to wettability improvement (Sun and Stylios, 2006;Wang and Qiu, 2007), shrinkproofing (Erra et al, 1999;Hesse et al, 1995) and anti-pilling (Rombaldoni et al, 2008a). To guarantee a successful plasma treatment, a number of conditions has to be met; the process evenness is one of the most important parameters to be taken into account, as well as the treatment effectiveness.…”