Volume 141, Issue 14 e55174
RESEARCH ARTICLE

Copolyimide molecular brushes with poly(methacrylic acid) side chains as additive to polyphthalamide membrane: Organization, physical, and transport properties

Ivan V. Ivanov

Corresponding Author

Ivan V. Ivanov

Biomimetic Polymer Materials, Institute of Macromolecular Compounds of the Russian Academy of Sciences, St. Petersburg, Russia

Correspondence

Ivan V. Ivanov, Biomimetic Polymer Materials, Institute of Macromolecular Compounds of the Russian Academy of Sciences, Bolshoi pr. 31, 199004 St. Petersburg, Russia.

Email: [email protected]

Contribution: Conceptualization (equal), ​Investigation (equal), Writing - original draft (equal), Writing - review & editing (equal)

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Galina A. Polotskaya

Galina A. Polotskaya

Physical Chemistry of Polymers, Institute of Macromolecular Compounds of the Russian Academy of Sciences, St. Petersburg, Russia

Contribution: Conceptualization (equal), ​Investigation (lead), Methodology (lead), Validation (lead), Writing - original draft (lead), Writing - review & editing (lead)

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Ivan S. Kuryndin

Ivan S. Kuryndin

Physical Chemistry of Polymers, Institute of Macromolecular Compounds of the Russian Academy of Sciences, St. Petersburg, Russia

Contribution: ​Investigation (equal), Writing - original draft (equal)

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Maria P. Sokolova

Maria P. Sokolova

Polymer Biomaterials and Systems, Institute of Macromolecular Compounds of the Russian Academy of Sciences, St. Petersburg, Russia

Contribution: ​Investigation (equal), Writing - original draft (equal)

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Alexander V. Yakimansky

Alexander V. Yakimansky

Polymer Nanomaterials and Compositions for Optical Media, Institute of Macromolecular Compounds of the Russian Academy of Sciences, St. Petersburg, Russia

Contribution: Conceptualization (equal), Supervision (equal), Writing - review & editing (equal)

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First published: 12 January 2024
Citations: 1

Abstract

Macromolecules of complex architecture find application as modifiers of commercial polymeric membrane materials. In this work, copolyimide molecular brushes (coPI) composed of polyimide backbone and poly(methacrylic acid) side chains were used to modify poly(m-phenylene iso-phthalamide) (PPA). Structure, physical, mechanical, and transport properties of dense nonporous PPA/coPI membranes containing up to 10 wt% coPI were studied. The effect of included coPI on the membrane structure was estimated using atomic force microscopy and mechanical tests. The coPI modifier contributes to the additional formation of free volume elements evenly distributed throughout the membrane. Transport properties of PPA/coPI membranes were investigated via sorption tests and pervaporation separation of methanol (MeOH) and methyl tert-butyl ether (MTBE) mixtures. The inclusion of coPI modifier in the PPA membrane leads to an increase in the total flux of the membrane. The highest separation factor was found for the PPA/coPI membrane containing 10 wt% coPI; transport properties of the best membrane were compared with the literature data on separation of the azeotropic MeOH–MTBE mixture.

DATA AVAILABILITY STATEMENT

Research data are not shared.

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