Transport of monocharged ions through environment-sensitive composite membranes based on polyelectrolyte complexes
作者： L.E. Bromberg
DOI: 10.1016/0376-7388(91)80056-C
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摘要: Studies were made of transport features composite membranes (CM) from Millipore nitrocellulose acetate ultrafilters (pore diameter 0.05 μm), impregnated with a polyelectrolyte complex (PEC) based on poly(acrylic) acid, poly(ethylenepiperazine) and poly(ethyleneimine). The H+ ion diffusion rate depended the starting pH, while value effective permeability dropped 4.5 × 10−6 to 2.6 10−7 cm2/sec when pH was raised 1.45 2.70. dependence CM concentration seems be due presence fixed ion-exchange groups in pores. At > 7 hydraulic (Lp) decreased abruptly, probably PEC hydrogel expansion ultrafilter pores, filling pore space dense gel. rejection coefficient OH−ions increased decrease Lp. Transport are analyzed terms “free” water volume as well surface bound groups.
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