ABSTRACT
Mathematical analysis of the isotherms for equilibrium water absorption by polymers display a correspondence to the theory of volume-centered filling of micropores regardless of the hydrophilicity of polymers. Structure of a microporous adsorbent, absent in the initial state, is formed as a consequence of reorganization of chains of the molecular-chain sponge during absorption. Thus, a part of the chain units is combined with the micropore, isolating water molecules as clusters, and another part is redistributed around the clusters as a fringe that stabilizes the system by increasing of the configuration entropy.
