Abstract
The moisture regain of textile fibers and the water content in solution equilibrated together with them were determined in the presence of various amounts of water solubilized by 0.1M Aerosol OT in perchloroethylene at 10, 20, and 30°C. The vapor pressure of water over the solution was also measured at each temperature. Rayon, wool nylon, and acrylic fabrics were used as test fibers.The sorption of solubilized water by the fibers from perchloroethylene is exothermic below 75% relative humidity. The sorption isotherms are sigmoidal in shape like those of the sorption of water vapor by the fibers in humid air.The values of parameter C in the Brunauer-Emmett-Teller equation were calculated as a function of the moisture regain of the fibers. The values of parameter C decreased as the moisture regain of the fibers increased. The heat of adsorption of water E1 and EAV, for the first layer and for the average of total amounts of water molecule adsorbed by the fibers, respectively, were calculated from the temperature dependence of parameter C, and it was found that the values of both E1 and EAV decreased as the moisture regain of the fibers increased. The values of EAV thus obtained were in good agreement with the heat of adsorption obtained from the change by temperature of vapor pressure of water adsorbed by the fiber, which was reported in the previous paper.
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