WATER VAPOUR SORPTION AND THERMAL ANALYSIS STUDY OF MAN–MADE CELLULOSIC FIBRES RELATED TO THEIR PROPERTIES IN APPLICATION
Authors: Ksenija Varga, Michael F. Noisternig, Ulrich J. Griesser, Roger N. Ibbett, and K. Christian Schuster
Abstract: The man–made cellulosic fibres lyocell, modal and viscose are widely used for various applications ranging from apparel and home textiles to technical and medical products. Lyocell fibres are favourable fibres due to the environmentally friendly spinning process with 99 % solvent recovery. In this book chapter, the main focus is on lyocell fibres. These fibres are highly absorptive and have a very smooth surface, which leads in combination to improved physiological properties important for textile comfort in wear and also important features for using the fibres in the medical field. The sorption study was done by measuring the water vapour uptake in dynamic sorption analysis which enable full sorption and desorption cycles starting from 0 % RH up to 90 % RH and backwards. The sorption data are discussed based on Guggenheim–Anderson –de Bohr (GAB) sorption model. Furthermore, the sorption models were applied on lyocell fibres functionalized with chitosan, lyocell filling fibres and lyocell fabrics after resin treatment. The heat of wetting measurements by reaction calorimetry proved that lyocell fibres have higher heat of wetting than cotton. From the investigation of the basic fibre properties, some conclusions on the wear comfort of the cellulosic textiles are established.