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Applications of Polymer, Composite, and Coating Materials
Solvation Effects on the Permeation and Aging Performance of PIM-1 based MMMs for Gas Separation Rujing Hou, Stefan J.D. Smith, Colin D. Wood, Roger J. Mulder, Cher Hon Lau, Huanting Wang, and Matthew R Hill ACS Appl. Mater. Interfaces, Just Accepted Manuscript • DOI: 10.1021/acsami.8b19207 • Publication Date (Web): 17 Jan 2019 Downloaded from http://pubs.acs.org on January 20, 2019
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ACS Applied Materials & Interfaces
Solvation Effects on the Permeation and Aging Performance of PIM-1 based MMMs for Gas Separation Rujing Hou,1 Stefan J. D. Smith,2* Colin D. Wood,3 Roger J. Mulder,2 Cher Hon Lau,4 Huanting Wang,1 Matthew R. Hill1, 2* 1: Department of Chemical Engineering, Monash University, Clayton, VIC 3169, Australia. 2: CSIRO, Bag 10, Clayton South, VIC 3169, Australia. 3: CSIRO, Australian Resources Research Centre, Kensington WA 4: School of Engineering, University of Edinburgh, Robert Stevenson Road, Edinburgh EH93FB, UK *
[email protected];
[email protected] ABSTRACT Membranes are particularly attractive for lowering the energy intensity of separations as they eliminate phase changes. Whilst many tantalising polymers are known, limitations in selectivity and stability somewhat preclude further development. Mixed-matrix membranes may address these shortcomings. Key to realisation is the intimate mixing between the polymer and the additive, to eliminate nonselective transport, improve selectivity, and resist physical aging. Polymers of Intrinsic Microporosity (PIMs) have inherently promising gas transport properties. Here, we show that porous additives can improve transport and resist aging in PIM-1. We develop a simple, low cost and scalable hypercrosslinked polymer (Poly-dichloroxylene, pDCX), which was hydroxylated to form an intimate mixture with the polar PIM-1. Solvent variation allowed control of physical aging rates, and improved selectivity for smaller gases. This detailed study has allowed many interactions within mixed matrix membranes to be directly elucidated, and presents a practical means to stabilise porous polymers for separation applications. Keywords: MMMs, Gas separation, Aging, Nanocomposite compatibility, Membrane casting
INTRODUCTION Membranes promise to be one of the most effective technologies for processing bulk quantities of gases due to higher energy efficiencies, lower capital cost, and plant foot print than adsorbent, solvent scrubbing, and thermal distillation methods.1-6 Critical to realizing the potential of membrane technologies is membrane module performance under real conditions, which are heavily dependent on the properties of the membrane materials.2 ,7 To date, membrane materials used in industrial settings are dominated by the conventional glassy polymers such as polyimide, polysulfone, cellulose acetate8-10, due primarily to their stability, and thus greater operating lifetimes, despite their low permeabilities. In order to achieve meaningful module permeances from such low flux materials, conventional glassy polymers are prepared as nanometre scale selective layers (
