Premium
Layer‐by‐layer assembled polyelectrolyte blend membranes and their use for ion separation and rejection
Author(s) -
Hoffmann Kristina,
Friedrich Tatjana,
Tieke Bernd
Publication year - 2011
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.22017
Subject(s) - polyelectrolyte , membrane , polyacrylic acid , materials science , polyacrylonitrile , chemical engineering , nanofiltration , permeation , acrylic acid , adsorption , polymer chemistry , sulfonate , polymer blend , polystyrene sulfonate , layer (electronics) , polymer , copolymer , chemistry , sodium , organic chemistry , composite material , biochemistry , pedot:pss , engineering , metallurgy
Abstract Polyelectrolyte blend films and membranes were prepared upon alternating electrostatic adsorption of polyallylamine hydrochloride (PAH) and mixtures of polystyrene sulfonate (PSS) and polyacrylic acid (PAA) in different ratio on solid supports. Infrared studies indicated that the PSS‐PAA blend composition of the films always differed from the mixture composition in the dipping solution, PSS being preferentially adsorbed. Films deposited on porous supporting membranes (polyacrylonitrile/polyethylene terephthalate) were studied on their ion permeation under diffusion dialysis conditions, and their flux and salt rejection under nanofiltration and reverse osmosis (RO) conditions. Blend membranes prepared at pH 1.7 exhibit a significantly improved anion separation and salt rejection, the ideal separation factor α(NaCl/Na 2 SO 4 ) of a membrane prepared from a PSS:PAA mixture of 1:1 (w/w) being 197 ± 10 (pure PAH/PSS: 45). The NaCl and Na 2 SO 4 rejections under RO conditions are 85 and 97% (pure PAH/PSS: 15 and 27%), respectively. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers