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Water–ethanol permseparation by pervaporation through photocrosslinked poly(vinyl alcohol) composite membranes
Author(s) -
Hirotsu Toshihiro,
Ichimura Kunihiro,
Mizoguchi Kensaku,
Nakamura Eiichiro
Publication year - 1988
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1988.070360801
Subject(s) - pervaporation , vinyl alcohol , membrane , swelling , polymer chemistry , chemical engineering , permeation , polymer , materials science , chemistry , organic chemistry , composite material , biochemistry , engineering
Water–ethanol permselectivity was investigated by pervaporation through composite membranes which were prepared by coating photocrosslinkable poly(vinyl alcohol) containing pendant styrylpyridinium group (0.86–3.93 mol %) on porous films. These membranes were water‐permselective, and the selectivity was dependent on the state of membranes; namely, incorporation ratio of styrylpyridinium group on poly(vinyl alcohol), molecular weight of the base polymer, coating thickness of a photopolymer, etc. Photocrosslinkable styrylpyridinium group showed, of course, the ionic character by a pyridinium moiety to work on permseparation of water effectively as well as preventing the dissolution of membranes by crosslinking. Membranes based on the higher molecular weight poly(vinyl alcohol) ( P = 1700) gave the higher permselectivity of water in general than those of lower molecular weight ( P = 500) one. Swelling of the polymers reached 160%, and permeation rate through the membranes increased with the increase of swelling. Selective diffusion of water was found to take place in swelling, and to play a part in the water‐permseparation through the membranes.