Poly water sorption/desorption

Rueda RD, Varkalis A (1995) Water sorption/desorption kinetics in poly(ethylene naphthalene-2,6-dicarboxylate) and poly(ethylene terephthalate). J Polym Sci Part B Polym Phys 33 2263-2268... 

Data on poly(ethyl methacrylate) from Williams et al (5 ) were specified as volume fraction of water sorbed as a function of partial pressure. In an earlier publication of Stannett and Williams (7) the glass temperature of the polymer was given as 65 C. Sorption and desorption measurements showed a very close concordance. Data on poly(methyl methacrylate) by Brauer and Sweeney ( ) were transformed from gravimetric to volume fraction using a density of 1.19. The glass temperature of this polymer Is 105°C. The authors report that "thin specimens reach a steady state value within a short time." Data for poly(methyl acrylate)... 

Crosslinked poly(2-hydroxyethylmethacrylate), PHEMA, has been prepared by radical polymerization in presence of different amounts of water and water-diacetine solutions. While homogeneous samples can be prepared at all water-diacetine content, amounts of water higher than 40% causes the formation of macroporous opaque sponges. Mechanical properties of water swollen samples have been measured and related to the crosslink formation during the polymerization process. From water diffusion kinetics in sorption and desorption experiments at 37 C the diffusion coefficients have been calculated. Measurements of the swelling at equilibrium in water-diacetine mix-res indicate the presence of "cosolvency" phenomenon for the samples studied. 

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