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A highly rigid and gas selective methanopentacene-based polymer of intrinsic microporosity derived from Tröger's base polymerization

Rhodri Williams, Luke. A. Burt, Elisa Esposito, Johannes C. Jansen, Elena Tocci, Carmen Rizzuto, Marek Lanč, Mariolino Carta Orcid Logo, Neil. B. McKeown

Journal of Materials Chemistry A, Volume: 6, Issue: 14, Pages: 5661 - 5667

Swansea University Author: Mariolino Carta Orcid Logo

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DOI (Published version): 10.1039/c8ta00509e

Abstract

Polymers of intrinsic microporosity (PIMs) have been identified as potential next generation membranematerials for the separation of gas mixtures of industrial and environmental relevance. Based on theexceptionally rigid methanopentacene (MP) structural unit, a Polymer of Intrinsic Microporosity (PI...

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Published in: Journal of Materials Chemistry A
ISSN: 2050-7488 2050-7496
Published: 2018
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa39305
Abstract: Polymers of intrinsic microporosity (PIMs) have been identified as potential next generation membranematerials for the separation of gas mixtures of industrial and environmental relevance. Based on theexceptionally rigid methanopentacene (MP) structural unit, a Polymer of Intrinsic Microporosity (PIM-MPTB)was designed to demonstrate high selectivity for gas separations. PIM-MP-TB was prepared usinga polymerisation reaction involving the formation of Troger's base linking groups and demonstrated an ¨apparent BET surface area of 743 m2 g1 as a powder. The microporosity of PIM-MP-TB was alsocharacterized by chain packing simulations. PIM-MP-TB proved soluble in chlorinated solvents and wascast as a robust, free-standing film suitable for gas permeation measurements. Despite lower gaspermeability as compared to previously reported PIMs, high selectivities for industrially relevant gas pairswere obtained, surpassing the 2008 Robeson upper bound for H2/CH4 and O2/N2, (e.g., PO2 ¼ 999Barrer; aO2/N2 ¼ 5.0) and demonstrating a clear link between polymer rigidity and selectivity. Upon aging,the permeability data move parallel to the Robeson upper bounds with a decrease of permeability,compensated by a related increase in selectivity. Mixed gas permeation measurement for CO2/CH4 andCO2/N2 mixtures confirmed the excellent selectivity of PIM-MP-TB for potentially relevant separationssuch as biogas upgrading and CO2 capture from flue gas. Importantly, unlike other high performingPIMs, PIM-MP-TB is prepared in four simple steps from a cheap starting materia
College: Faculty of Science and Engineering
Issue: 14
Start Page: 5661
End Page: 5667

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