Water vapor sorption mechanism and hygroscopicity of textile materials

It is shown that the quasichemical model bears much more information on the supramolecular structure Of polymers and the mechanism of sorption of water vapor than the equations borrowed from the theory of adsorption on "rigid" adsorbents. The physical meaning of the constants and limitations of the existing equations formally used for describing sorption in swollen systems are analyzed. The constants of the quasichemical model for sorption of water vapor by different classes of polymers are reported.