Title: Nanostructure of organic-inorganic composite materials based on polymer hydrogels

Authors: N.A. Bulychev; A.V. Ivanov

Addresses: P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Avenue, 53, Moscow, 119991, Russia; Moscow Aviation Institute, National Research University, Volokolamskoe shosse, 4, Moscow, 125993, Russia ' N.N. Blokhin National Medical Research Center of Oncology, Russian Ministry of Health, Kashirskoe shosse, 24, 115478, Moscow, Russia; O.K. Skobelkin State Scientific Center of Laser medicine FMBA, Studencheskaya, 40, Moscow, 121165, Russia

Abstract: The initial stage of gelation of organic-inorganic hybrid hydrogels based on poly(N-vinylpyrrolidone) and the products of hydrolytic polycondensation of tetramethoxysilane has been studied by capillary viscometry. The development of strong bonds between polymer molecules and silica particles in aqueous solutions is proved by the electrokinetic sonic amplitude method. The molecular mass of poly(N-vinylpyrrolidone), the concentration of starting components, and their total amount affect the onset time of gelation in poly(N-vinylpyrrolidone)-water-tetramethoxysilane systems. The general scheme of formation of three-dimensional networks in such systems under the conditions of mutual penetration of poly(Nvinylpyrrolidone) coils is suggested. According to this scheme, nanoparticles of the general formula SiOx(OH)y(OR)z linking poly(N-vinylpyrrolidone) macromolecules serve as junctions of the gel network due to the formation of hydrogen bonds between hydrogens of silanol groups of organosilanes and oxygens of carbonyl groups of poly(N-vinylpyrrolidone).

Keywords: polymers; hydrogels; nanoparticles; adsorption; surface; gel formation; gel structure; elecrokinetic sonic amplitude; solid particles; physical bonds.

DOI: 10.1504/IJNT.2019.106610

International Journal of Nanotechnology, 2019 Vol.16 No.6/7/8/9/10, pp.344 - 355

Published online: 15 Apr 2020 *

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