The Entropic Mechanism of Water Solvation of Polymers
Titel:
The Entropic Mechanism of Water Solvation of Polymers
Auteur:
Mikheev, Yu. A. Zaikov, G. E.
Verschenen in:
International journal of polymeric materials
Paginering:
Jaargang 46 (2000) nr. 3-4 pagina's 511-532
Jaar:
2000-07-01
Inhoud:
Computational analysis of isotherms of equilibrium water absorption by polymers indicates the isotherms follow 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 through reorganization of chains of the molecular-chain sponge during adsorption. Thus, a part of chain units is combined in micropores isolating water molecules as clusters, and another part is redistributed around the clusters as a fringe that stabilizes the system by increasing the configuration entropy. The problem of the physical state of sorbed water in polymers is important from positions of the mechanisms of its diffusion in polymeric membranes, its effect on physical properties of polymers, participation in dyeing and fading of fabrics, superseding of stabilizers and plasticizers, and also in guided delivering of drugs in the organism from polymeric units of medical use.
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