caa a22 4500 605489556 CHVBK 20210128105157.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1134/S1061933X15030023 doi (NATIONALLICENCE)springer-10.1134/S1061933X15030023 Peculiarities of the transport properties of chitosan films. 1. Concentration prehistory of pervaporation [Elektronische Daten] [E. Ageev, N. Matushkina] Chitosan films prepared by the thermal method from molding solutions containing ethanol as a chitosan precipitant have been used as separating membranes for pervaporation of an aqueous isopropanol solution. The flux density and permeate composition have been determined as functions of the composition of a molding solution and a solution to be separated, as well as the concentration prehistory of the separation process. The concentration prehistory reflects the specific features of swelling polymer sorbents, which are distinguished by a labile structure and macroscopic sorption deformations. The existence of a concentration prehistory implies that, at a fixed concentration of an initial solution, parameters characterizing the transport properties of a polymer depend on the process route in which this concentration has been achieved. The composition of a molding solution and the route of variations in the initial concentration of a solution to be separated that correspond to the highest value of our criterion for the process efficiency have been determined. It has been shown that, in the case of films formed from a solution containing 20 wt % ethanol, the water flux density reversibly increases by more than 100 times as compared with the flux density of a water-alcohol solution. Pleiades Publishing, Ltd., 2015 Ageev E. Department of Chemistry, Moscow State University, 119991, Moscow, Russia aut Matushkina N. Department of Chemistry, Moscow State University, 119991, Moscow, Russia aut Colloid Journal Pleiades Publishing 77/3(2015-05-01), 251-255 1061-933X 77:3<251 2015 77 10595 https://doi.org/10.1134/S1061933X15030023 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1134/S1061933X15030023 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ageev E. Department of Chemistry, Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Matushkina N. Department of Chemistry, Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 773 0- Colloid Journal Pleiades Publishing 77/3(2015-05-01), 251-255 1061-933X 77:3<251 2015 77 10595 SWISSBIB 605489556