Composite perfluorinated membranes modified by polyvinyl alcohol cross-linked with sulfosuccinic acid

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Abstract

The effect of polyvinyl alcohol (PVA) cross-linked with sulfosuccinic acid on the structure, morphology, physical, mechanical and electrochemical properties of composite membranes made of domestic perfluorinated copolymer, an analogue of Nafion, and PVA was studied. An increase in the amount of cross-linked PVA in the membrane leads to an increase in proton conductivity. The crystallinity of the composites depends on the proportion of the cross-linking agent. The morphology of the membrane surfaces varies significantly: the lower surface has a uniform microstructure, and the upper surface forms three-dimensional folded structures during self-organization of polymer chains in the surface layer. According to energy-dispersive analysis, the two layers of the membrane differ significantly in chemical composition, which is illustrated by the distribution profiles of fluorine across the membrane thickness. The observed structural and morphological features of the membranes explain the differences in their proton conductivity.

About the authors

O. N. Primachenko

Branch of Konstantinov St. Petersburg Nuclear Physics Institute, National Research Centre “Kurchatov Institute” – Institute of Macromolecular Compounds

Email: alex-prima@mail.ru
St. Petersburg, 199004, Russia

E. A. Marinenko

Branch of Konstantinov St. Petersburg Nuclear Physics Institute, National Research Centre “Kurchatov Institute” – Institute of Macromolecular Compounds

St. Petersburg, 199004, Russia

V. T. Lebedev

Neutron Researches Department, Konstantinov St. Petersburg Nuclear Physics Institute, National Research Centre “Kurchatov Institute”

Gatchina, Russia

V. A. Orlova

Khlopin Radium Institute

St. Petersburg, Russia

V. D. Vavilova

Branch of Konstantinov St. Petersburg Nuclear Physics Institute, National Research Centre “Kurchatov Institute” – Institute of Macromolecular Compounds

St. Petersburg, 199004, Russia

I. V. Gofman

Branch of Konstantinov St. Petersburg Nuclear Physics Institute, National Research Centre “Kurchatov Institute” – Institute of Macromolecular Compounds

St. Petersburg, 199004, Russia

O. S. Lezova

Branch of Konstantinov St. Petersburg Nuclear Physics Institute, National Research Centre “Kurchatov Institute” – Grebenshchikov Institute of Silicate Chemistry

Email: svkononova@list.ru
St. Petersburg, 199034, Russia

V. V. Klechkovskaya

Shubnikov Institute of Crystallography of the Kurchatov Complex Crystallography and Photonics of the NRC “Kurchatov Institute”

Moscow, 119333, Russia

E. N. Vlasova

Branch of Konstantinov St. Petersburg Nuclear Physics Institute, National Research Centre “Kurchatov Institute” – Institute of Macromolecular Compounds

St. Petersburg, 199004, Russia

S. V. Kononova

Branch of Konstantinov St. Petersburg Nuclear Physics Institute, National Research Centre “Kurchatov Institute” – Institute of Macromolecular Compounds

Email: svkononova@list.ru
St. Petersburg, 199004, Russia

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