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Ultrafiltration Membranes Based on Various Acrylonitrile Copolymers

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Abstract

The structure and properties of ultrafiltration membranes synthesized from bicomponent solutions in N,N-dimethylformamide using five commercial acrylonitrile copolymers of various compositions and molecular masses have been studied. The molecular mass characteristics of the copolymers (Mw, Mw/Mn) have been determined; the viscosity properties of dilute and concentrated solutions have been studied. It has been shown that depending on the chemical composition and molecular mass of the copolymer, the concentration dependence of the water flux is different: for copolymers with a molecular mass of Mw of 76 000–81 000 g/mol, with an increase in the copolymer concentration in solution from 12 to 16%, the water flux of the membranes decreases from 300–500 to 40–150 L/(m2 h) depending on the copolymer composition. For samples with a higher molecular mass (Mw = 99 000 and 107 000 g/mol), the water flux of the membranes hardly depends on the copolymer concentration in the casting solution; it is 150 and 75 L/(m2 h), respectively. The rejection factor of the membranes with a molecular mass of 40 000 g/mol for polyvinylpyrrolidone increases with increasing copolymer concentration in the casting solution regardless of the chemical composition and molecular mass of the copolymer. Scanning electron microscopy studies of the membrane structure have shown that membranes synthesized from copolymers with a higher molecular mass have a denser structure and a thicker selective layer than the respective parameters of membranes synthesized from acrylonitrile copolymers with a lower molecular mass, which are characterized by the presence of large macrovoids in the membrane matrix. These differences in the membrane structure are attributed to different viscosities of the casting solutions at identical copolymer concentrations.

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ACKNOWLEDGMENTS

The authors thank D.S. Bakhtin for SEM studies of the membranes.

Funding

The reported study was funded by RFBR according to the research project no. 18-58-00033 Bel_a and BRFFR according to the research project no. X18P-083.

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Correspondence to D. N. Matveev.

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Translated by M. Timoshinina

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Matveev, D.N., Plisko, T.V., Volkov, V.V. et al. Ultrafiltration Membranes Based on Various Acrylonitrile Copolymers. Membr. Membr. Technol. 1, 386–393 (2019). https://doi.org/10.1134/S2517751619060015

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  • DOI: https://doi.org/10.1134/S2517751619060015

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