Effect of sodium hydroxide pre-treatment on the optical and structural properties of lyocell

Parikshit Goswami, Richard S. Blackburn, Hassan M. El-Dessouky, Jim Taylor, Patrick White

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37 Citations (Scopus)

Abstract

Lyocell is a type of regenerated cellulose. Fibres spun from cellulose solution in N-methylmorpholine-N-oxide hydrate consist of crystalline cellulose II and amorphous cellulose. Lyocell fabrics were treated with aqueous sodium hydroxide solution (NaOH) to study the influence of alkali on optical and structural properties. It was observed that sodium hydroxide treatment causes the density, orientation and crystallinity of lyocell fibre to decrease with increasing sodium hydroxide concentration, a corresponding decrease in tensile strength is also observed. The greatest change in fibre properties occurs between 3.0 and 5.0 mol dm-3NaOH. This is attributed to the onset of formation of Na-cellulose II at 3.0 mol dm-3NaOH; a fully formed Na-cellulose II structure is expected above 6.8 mol dm-3NaOH. Formation of Na-cellulose II causes plasticization of the lyocell fibres as both inter- and intra-molecular hydrogen bonds are broken by these higher sodium hydroxide concentrations. © 2008 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)455-465
Number of pages11
JournalEuropean Polymer Journal
Volume45
Issue number2
Early online date5 Nov 2008
DOIs
Publication statusPublished - Feb 2009
Externally publishedYes

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