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Synthesis of permselective membranes by radiation induced grafting of hydrophilic monomers into poly(tetrafluoroethylene) films
Author(s) -
Chapiro A.,
JendrychowskaBonamour A.M.
Publication year - 1980
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760200306
Subject(s) - membrane , pervaporation , grafting , polymer chemistry , tetrafluoroethylene , materials science , methacrylic acid , styrene , chemical engineering , reverse osmosis , permeation , monomer , acrylic acid , copolymer , chemistry , polymer , composite material , biochemistry , engineering
Abstract A large variety of permselective membranes were prepared by radiation grafting techniques. Grafting of styrene into poly‐(tetrafluoroethylene) films followed by sulfonation led to strong anionic membranes showing good performance in reverse osmosis. Carboxylic membranes were prepared by grafting acrylic and methacrylic acids. Cationic membranes were obtained via grafting 4‐vinylpyridine. These membranes were tested in various fractionation processes including reverse osmosis. N‐vinylpyrrolidone grafts exhibited high selectivity for separating water from organic solvents by pervaporation. Bifunctional membranes containing both carboxylic and pyridine groups were obtained by two successive grafting steps either in bulk giving rise to “homogeneous” membranes with unusual swelling properties, or into localized areas generating mosaic membranes which exhibit negative osmosis and increased rates of ion‐pair diffusion.