Composite membranes with ultrathin separation layer prepared by self-assembly of polyelectrolytes

摘要: Abstract New composite membranes with ultrathin self-assembled polyelectrolyte separating layer and their use in gas, liquid ion separation are described. Composite were prepared by alternating electrostatic adsorption of polycations polyanions on a porous PAN/PET supporting membrane (a polyethylenenterephthalate fleece coated thin polyacrylonitrile). As the poly(allylamine hydrochloride) (PAH), poly(ethylenimine) (PEI), poly(diallyldimethyl–ammonium chloride) (PDADMAC), poly(4-vinylpyridine) (P4VP) chitosan (CHI) used, polyanion was always poly(styrene sulfonate sodium salt) (PSS). Studying CO2 N2 permeation rates, selectivities for (α=1.5) only found P4VP/PSS layer. ethanol–water pervaporation, factors α′ up to 80 found, when made PAH/PSS annealed at T≥60°C. For non-annealed samples, highest value 20. It PEI/PSS. Various effects preparation operation conditions flux factor discussed. NaCl MgCl2 aqueous solution, selective transport monovalent Na+ if PAH/PSS. The rate 15.1 times higher than Mg2+. Our study indicates that useful materials separation, although individual polyions may exhibit very different capability.