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Temperature dependence of physical properties in cross linked hydrogels

Temperature dependence of physical properties in cross linked hydrogels

Membrane 8(1): 39-45

The temperature dependence of physical properties was investigated for 2 different types of cross-linked hydrogel membranes, prepared from 2-hydroxyethyl methacrylate (HEMA)/methyl methacrylate (MMA) copolymer system and from N-vinyl pyrrolidone (N-VP)/MMA copolymer system. The water content of the N-VP/MMA copolymer decreased in a temperature range from C, but for the HEMA/MMA copolymer it first decreased to .apprx. C and then increased at higher temperatures. The change in O2 permeability with rising temperature showed the same behavior as water content of hydrogels, since permeation is due to water transport through swollen hydrogels. The retractive force of the N-VP/MMA copolymer for a small strain below .LAMBDA. = 1.50 increased with rising temperature, for a larger strain a retractive force minimum was found at .apprx. C, where .LAMBDA. = L/Lo; with L being the stretched gel strip length and Lo being the unstretched length. Under conditions of osmotic equilibrium, Warren and Prins observed a tensile load maximum at C for a specimen held at constant length on HEMA gels. The results obtained in this study were contrary to their observation:a plot of the retractive force against temperature showed a minimum at .apprx. C. Hydrogels of varying water content were prepared to investigate the relationships between water content and O2 permeability between water content and tensile load, and between water content and refractive index. Poly (HEMA), HEMA/MMA copolymer and N-VP/MMA copolymer were formulated to give hydrogels with water content from .apprx. 23-82%.

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