The Nature of Water in Tactic Poly(2-Hydroxyethyl Methacrylate) Hydrogels

摘要: The hypothesis that three classes of water exist in hydrogels, namely X (free water-like), Z-water (bound and Y (interfacial has been verified generally accepted. To further check the validity this to study nature X, Y, Z as conformation changes, several experiments have done using Tactic Poly(2-hydroxyethyl methacrylate) (P-HEMA) gels. Thermal expansively data for tactic P-HEMA gel was obtained. In each case isotactic syndiotactic P-HEMA, higher content gels showed an extremely sharp volume change at , indicating presence normal free water-like. Lower no anomalous thermal expansion, is bound medium exhibited intermediate behavior. These results were also confirmed by bulk conductivity measurments. differential scanning calorimeter(DSC) experiment simply introduced verify water-like quantities which obtained method dilatometry specific conductivity. Observing amounts with tacticity, similar may be due same primary structure polymer difference interfacial secondary tertiary polymer. Therefore, varies, will varied. order demonstrate these concepts, Russel et al.'s CPK space-filling molecular models utilized.