Poly(2-hydroxyethyl methacrylate) (p-HEMA) is a hydrophilic methacrylate polymer which was first prepared by Wichterle and Lim OJ.This polymer, and many other synthetic hydrogels, has been extensively examined for potential biomedical applications (2J.Although many studies have focused on the physicochemical nature of these hydrogels, many questions remain unanswered. Among these are the nature, organization, and role of water in determining such properties as interfacial and transport phenom ena.Problems which deal with the presence of water and the structure of water at the molecular level are often complex. For hydrogels, i t has been proposed (3) that water can be treated in terms of a three state model.These include: bound, interfacial, and "bulk-like" water.Bound water is strongly associated with the polymer, probably as water hydrating the hydrophilic groups of the polymer.Interfacial water is probably associated with hydrophobic interactions between the polymer segments.Finally, "bulk-like" water is that with properties which are similar to that of bulk water in aqueous solution.Several studies have been designed in an effort to verify this model. The total gel water content was estimated semiquantitative^ using NMR (4,_5).Simi lar approaches were made to investigate the state of"water in p-HEMA gels using the techniques of dilatometry, specific conducti vity and differential scanning calorimetry (6).Recently, we have examined solute permeation through hydrogel membranes in an effort to develop models which describe in detail the transport phenomena with particular emphasis on the role of water in this process.These studies have utilized p-HEMA and its copolymers, and both hydrophobic and hydrophilic solutes (7*8,9).It was determined that p-HEMA and its copoly mers are permeable to both hydrophobic and hydrophilic solutes. The factors which influence the permeabilities include the nature and per cent of crosslinkers and the water content of the hydrogel .In this manuscript, the permeabilities of water soluble non-
This study was carried out to investigate a influence of humidity variation (%) on the magnetic properties and the surface flaws in the fabrication of Fe-based Fe
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