Gel deswelling under reverse osmosis

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Abstract
When a swollen gel is pressed into contact with a semipermeable membrane, the solvent is squeezed out at the interface and the gel deswells. The rate at which the gel far from the interface advances is found to be proportional to [(P 0−E)/f t]1/2, where P 0 is the applied pressure, E the longitudinal elastic modulus of the gel,f the friction coefficient between the solvent and polymer, and t the elapsed time. Satisfactory agreement is found between the experimental macroscopic values of E obtained in this way for polyacrylamide gels at two concentrations and the microscopic values of E obtained from inelastic light scattering.

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