Studies in the kinetics of removal of water from cellulosic fibers

Abstract

A etudy haa been made of the kinetica of the removal of water from native, alkaliswollen, and regenerated duloeic fibem under well dehed conditions of experiment. In all caw, the rate of evaporation m e appeam to be made up of five dietinct and separate portions, and there are four points on each curve at which sudden changee of direction take place. From the changea in the rates of removal of water, attempta have been made to determine the amounts of water present in celluloeic fibem with different degreee of aeaociation with the fiber subetance and to compare them valuea with thoee recorded by other workem employing different techniques. Removal of primary adsorbed water from different celluloeic fibers could be beat reprseented by three Mitt phaeee, the firat two of which obey kinetics of reaction of firat order and with apparent activation energy of the order of 8-9 kd./mole. An attempt haa also been made to calculate the radii of crrpillariea preaent in water-awollen celluloeic fibers. Y43

Measurement and Significance of the Water Retention Properties of Papermaking Fibres

“…As an example, the measurement of drying rates has been applied to pulp and other cellulose fibres by previous workers . This method has been refined in one case (13) to the extent that five distinct consecutive slopes could be detected in drying rate curves and interpreted in terms of different retention mechanisms. Other applications have been less successful.…”