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Dyeing Behaviour of Lyocell Fabric: Effect of NaOH pre-treatment

Goswami, Parikshit, Blackburn, Richard S., Taylor, Jim and White, Patrick (2009) Dyeing Behaviour of Lyocell Fabric: Effect of NaOH pre-treatment. Cellulose, 16 (3). pp. 481-489. ISSN 0969-0239

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To understand the effect of alkali pre-treatment on the dyeing of lyocell fabrics, samples are pre-treated with 0.0–7.0 mol dm−3 NaOH using a pad-batch process and then dyed with different types of reactive dyes. Exhaustion, fixation, and visual colour strength (K/S values) are measured. It is observed that sodium hydroxide pre-treatment significantly improves the colour yield, exhaustion, and fixation for all dyes used. Highest K/S values are obtained when the fabrics are pre-treated with 2.0–2.5 mol dm−3 NaOH. Cross-sectional analysis shows that below this optimum concentration the core fibres in the yarn are not dyed; at optimum concentration all fibres in yarn cross-section are homogeneously dyed. Cross-sectional analysis shows that as the pre-treatment concentration of NaOH increases above 2.5 mol dm−3, the fibres change progressively from a circular to angular cross-section, forming a solid unit. The decrease in K/S above the treatment concentration of 2.5 mol dm−3, though the %E and %F remains almost constant, is attributed to the distribution of dye over a larger surface area of the outer fibres in the yarn cross section, forcing the K/S at λmax to decrease.

Item Type: Article
Uncontrolled Keywords: Regenerated cellulose; Cellulose II; Sodium Hydroxide; Swelling; Reactive dyes; Diffusion; Morphology
Subjects: Q Science > QD Chemistry
Q Science > QH Natural history > QH301 Biology
Schools: School of Art, Design and Architecture
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Depositing User: Jonathan Cook
Date Deposited: 07 Sep 2017 07:41
Last Modified: 28 Aug 2021 12:20


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