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Percolation phenomena in polymer nanocomposites containing carbon nanotubes

Work number - M 11 AWARDED

Presented Petro Mohyla Black Sea National University

Dr. Sci. Lysenkov E.A.

The purpose of the study is to investigate the structure and functional properties, as well as to establish the features of percolation phenomena in systems based on polyethers filled with carbon nanotubes.

For the first time, the author conducted comprehensive studies of the features of percolation behavior of systems based on aliphatic polyethers filled with carbon nanotubes (CNTs). It is established that the behavior of polyether-CNT systems in the field of percolation transition can be described within the framework of critical percolation theory. It is shown that the type of matrix, its phase state, and the conditions of dispersion of carbon nanotubes, which is related to the microstructural effects of the dispersed medium and clusters of the nanofillers, influence on the width of the “critical region” and the value of the critical concentration of the percolation transition of polyether-CNT systems.

A model for describing electrical conductivity in polyester-CNT systems in a wide concentration range is proposed. Within this model, three concentration regions are distinguished, characterized by different charge transfer mechanisms. An approach has been developed to separate the contributions of the polymer matrix (region up to the percolation threshold), the surface layer (the “critical region” percolation threshold) and the direct contacts between the CNTs (the area after the percolation threshold) to the overall electrical conductivity of the polyether-CNT system.

It is revealed that upon reaching the critical concentration, which correlates well with the value of the percolation threshold for electrical conductivity, there is a change in the thermophysical, mechanical and dielectric properties of polyether-CNT systems.

The established patterns of influence of nanofillers on the structure and physical properties of polyether based systems create a scientific basis for improving the technology of manufacturing polyfunctional materials with adjustable properties (such as polyurethanes), which will meet the best world analogues.

Number of publications: 62, incl. chapter in the monograph, published abroad, 48 articles (7 - in English-language journals with impact factor). The total number of links to authors' publications / h-index of work, according to the databases is respectively: Web of Science - 95/5, Scopus - 108/7, Google Shcolar - 217/8. Received 1 patent of Ukraine for utility model.