The water vapour sorption behaviour of three celluloses: analysis using parallel exponential kinetics and interpretation using the Kelvin-Voigt viscoelastic model |
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Authors: | Yanjun Xie Callum A S Hill Zaihan Jalaludin Dongyang Sun |
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Institution: | (1) Key Laboratory of Bio-based Material Science and Technology, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, People’s Republic of China;(2) Forest Products Research Institute, Joint Research Institute for Civil and Environmental Engineering, School of Engineering and the Built Environment, Edinburgh Napier University, 10 Colinton Road, Edinburgh, EH10 5DT, UK; |
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Abstract: | The objective of this study was to examine the water vapour sorption behaviour of three celluloses, which were originally
derived from cotton fibers, using a dynamic vapour sorption apparatus, including analyses of the sorption rate and hysteresis
occurring in the isotherm run. Cotton linter, α-cellulose, and microcrystalline cellulose (MCC), respectively attained equilibrium
moisture contents of 14.2, 20.6, and 16.9% at a relative humidity (RH) of 95%. All three cellulosic materials exhibited sorption
hysteresis to varying degrees throughout the full RH range; the MCC and α-cellulose displayed the lowest and highest total
hysteresis, respectively. The sorption kinetics were analysed in terms of the parallel exponential kinetics (PEK) model, with
excellent fits to the data being obtained. The PEK data is further interpreted on the basis of two Kelvin-Voigt elements operating
in series. Clear differences in behaviour were seen between the α–cellulose and the other two celluloses in this study. The
relative importance of capillary condensation and matrix viscoelasticity with respect to sorption hysteresis is discussed. |
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