Abstract
The total water capacity of a series of never-dried and re-wetted cellulosic fibres has been shown to correlate with the accessible volume described by a thermodynamic model. The model was applied to interpret the adsorption behaviour of a range of reactive dyes in electrolyte solutions and was successful in accounting for differences in fibre anionic charge. Comparative solute exclusion data indicated the existence of a population of very small spaces in never-dried cellulosic fibres, which may be associated with water disrupting the cellulose \({1\overline{1}0}\) crystal planes. Such intra-crystalline spaces may provide sites for uptake of planar substantive dyes and may also be accessible to sodium ions. The study showed that never-dried lyocell undergoes a large reduction in total wet capacity following initial drying, which is believed to be due to both exudation of crystal water and to inter-fibrillar crystallisation. This crystallisation mechanism may not be so effective for viscose and modal, which have poorer structural organization. Re-wetted lyocell exhibits high dye adsorption, which may result from the development of a uniform fibrillar morphology with a high surface area. This structural aspect is not expressed by the thermodynamic model.
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Acknowledgements
The authors would like to thank The Christian Doppler Society for financial support, and also Lenzing AG, for financial support and for supply of fibre samples. Thanks also to Dr Christian Schuster for helpful discussions.
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Ibbett, R.N., Kaenthong, S., Phillips, D.A.S. et al. Solute adsorption and exclusion studies of the structure of never-dried and re-wetted cellulosic fibres. J Mater Sci 42, 6809–6818 (2007). https://doi.org/10.1007/s10853-006-1426-4
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DOI: https://doi.org/10.1007/s10853-006-1426-4