A Model for Sorption of Water Vapor by Cellulosic Materials

The sorption of water vapor by cellulosic materials is modeled with an exponential relationship between the Gibbs free energy change and equilibrium moisture content. The utility and simplicity of the model are illustrated with applications to several sets of sorption data in the literature. Adsorption and desorption isotherms generally are described with an accuracy of ±0.5% moisture content up to relative humidities of about 90%. Effects of temperature and sorption hysteresis are examined briefly