Attenuated total reflectance Fourier-transform Infrared spectroscopy analysis of crystallinity changes in lyocell following continuous treatment with sodium hydroxide |
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| Authors: | Ján ?iroký Richard S Blackburn Thomas Bechtold Jim Taylor Patrick White |
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| Institution: | 1.Green Chemistry Group, Centre for Technical Textiles,University of Leeds,Leeds,UK;2.Christian Doppler Laboratory for Textile and Fibre Chemistry in Cellulosics, Research Institute of Textile Chemistry and Textile Physics,University of Innsbruck,Dornbirn,Austria;3.Lenzing Fibers, Lenzing Aktiengesellschaft,Lenzing,Austria |
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| Abstract: | Cellulose is a linear 1,4-β-glucan polymer where the units are able to form highly ordered structures, as a result of extensive
interaction through intra- and intermolecular hydrogen bonding of the three hydroxyl groups in each cellulose unit. Alkali
has a substantial influence on morphological, molecular and supramolecular properties of cellulose II polymer fibres causing
changes in crystallinity. These physical changes were observed herein using ATR-FTIR spectroscopy, following continuous treatment
of the cellulose II fabrics with aqueous sodium hydroxide solution under varying condition parameters. Post-treatment, maxima
for total crystallinity index and lateral order index, and minima for hydrogen bond intensity, were observed at concentrations
of 3.3 and 4.5 mol dm−3 NaOH, when treated at 25 °C and 40 °C, respectively. Under these treatment conditions, it is proposed that maximum molecular
reorganisation occurs in the amorphous and quasi-crystalline phases of the cellulose II polymer. |
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