БЛОК-СОПОЛИМЕРЫ, ПОЛУЧЕННЫЕ С ИСПОЛЬЗОВАНИЕМ МАКРОИНИЦИАТОРА, 2,4-ТОЛУИЛЕНДИИЗОЦИАНАТА И ОРГАНОЗАМЕЩЁННЫХ КРЕМНЕЗМОВ

Abstract

Using tetraethoxysilane, polyoxyethylene glycol, and copper chloride (CuCl2), self-condensation-resistant silicas with polyoxyethylene branches (ASiP-Cu) were synthesized. Features of the supramolecular organization of transparent block copolymers (OBCs) determine the chemical structure of the internal cavity of micro-sized voids and significant changes in the shape of the spectrum of the sorbed dye. The use of ASiP-Cu modifiers leads to a noticeable increase in the sorption capacity of OBS, which depends on the method of preparing ASiP-Cu and its amount in the OBC composition. The most significant increase in intensity in the maximum region of the electronic spectrum of immobilized organic dye R6G is observed when using ASiP-Cu-0.1 and ASiP-Cu-0.5 which were obtained using 0.1 and 0.5 wt.% CuCl2, respectively. An increase in the intensity of R6G sorption on OBC with an increase in the content of modifiers in their composition is accompanied by a decrease in the contact angle of the polymers. Modification of block copolymers using ASiP-Cu leads to an increase in their water absorption, reflecting an increase in the free volume of the polymers. Using OBC modified with 0.5 wt.% of the ASiP-Cu-0.5, a test system was obtained by immobilizing the analytical reagent PAN onto the polymer. It was found that PAN molecules quickly fill the free space of the polymer. Before carrying out the analytical reaction to determine CuCl2, the polymer with (1-(2-pyridylazo)-2-naphthol) (PAN) immobilized on it was preliminarily kept in water for 24 hours. This procedure is necessary to prevent the processes of desorption of the analytical reagent and its capture of ions of the metal being determined directly in the solution. The surface morphology of the samples was studied using atomic force microscopy (AFM). Indentations are fixed on the surface of the samples. AFM images indicate the porous structure of OBC. Modification of OBC using ASiP-Cu leads to noticeable changes in the morphology of modified OBC, which depends on the structure of ASiP-Cu. The use of the ASiP-K modifier leads to a reduction in the number and size of depressions on the surface of the OBC sample.