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Abstract
It has been investigated whether it is possible to induce selectivity to polymer membranes by modifying them with an alkylated crown ether derivative. Polypropylene (PP) membranes were hydrophilized with 2-hydroxymethyl [18]corona-6 palmitate solutions of concentrations ranging from 0 to 60 wt% in a 1,2-dichloroethane-hexane solvent system of 1:4 volume ratio. The investigations were carried out by a impedance measurement method using two electrolyte solutions: 0.1 mol · dm−3 NaCl and 0.1 mol · dm−3 KCl. Changes in transport properties of the studied membranes were evaluated as a function of hydrophilizing agent concentrations. Electric resistance of the studied membranes was found to decrease drastically in the 0–5 wt% 2-hydroxymethyl [18]corona-6 palmitate concentration range, and it proved to be constant at higher concentrations. Non-Debye capacitance of the membranes increased in the 0–5% concentration range, and was constant at higher concentrations. Polypropylene membranes hydrophilized with 2-hydroxymethyl[18]corona-6 palmitate were found to behave differently depending on the electrolyte used. This suggests that macrocyclic groups are able to induce selectivity to poly-propylene membranes.