Modification of Polymer Membrane Permeability by Graft Copolymerization
The dependence of polymer membrane permeation properties on the nature of grafted polymer chain length, conformation, and domain formation have been elucidated using several membrane materials subjected to controlled graft copolymerization procedures. Improved permeation barrier characteristics of poly(isoprene-gmethylmethacrylate) to inert gas penetrants were found for short chain or densified graft domains as compared with long chain or extended domains. The permselectivity and degradation resistance of polyethylene-g-poly(potassium acrylate) membranes to ionic penetrants were considerably enhanced by surface plus internal grafting of polystyrene. The chemical nature, molecular weight, spatial distribution, and domain conformation of grafted copolymer are factors affecting membrane permeability which can be controlled by feasible variations in polymerization procedures.
KeywordsRelative Permeability Graft Copolymer Membrane Material Silver Salt Chain Transfer Agent
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- 1.J. Crank and G. S. Park, Eds., Diffusion in Powers, Academic Press, London, 1968.Google Scholar
- 2.C. E. Rogers, in Physics and Chemistry of the Orzanic Solid State, Vol. II., D. Fox, M. Labes, and A. Weissberger, Eds., Interscience, New York, 1965, Chapter 6.Google Scholar
- 3.D. Machin and C. E. Rogers, “The Concentration Dependence of Diffusion Coefficients in Polymer-Penetrant Systems”, CRC Critical Reviews in Macromolecular Sci., CRC Publ., Cleveland, April 1972.Google Scholar
- 4.C. E. Rogers, J. R. Semancik, and S. Kapur, Polymer Sci. Tech., 1, 297 (1973).Google Scholar
- 7.H. B. Hopfenberg, V. Stannett, F. Kimura, and P. T. Rigney, Appl. Polym. Symp. No. 13, 139 (1970).Google Scholar
- 8.V. Stannett, H. B. Hopfenberg, and J. L. Williams, Polym. Sci., Tech., 1, 321 (1973).Google Scholar