High-Pressure CO2 Sorption in Polymers of Intrinsic Microporosity under Ultrathin Film Confinement
KAUST DepartmentAdvanced Membranes and Porous Materials Research Center
Physical Sciences and Engineering (PSE) Division
Chemical and Biological Engineering Program
KAUST Grant NumberOSR-2015-SEED-2445-01
Permanent link to this recordhttp://hdl.handle.net/10754/627479
MetadataShow full item record
AbstractUltrathin microporous polymer films are pertinent to the development and further spread of nanotechnology with very promising potential applications in molecular separations, sensors, catalysis, or batteries. Here, we report high-pressure CO2 sorption in ultrathin films of several chemically different polymers of intrinsic microporosity (PIMs), including the prototypical PIM-1. Films with thicknesses down to 7 nm were studied using interference-enhanced in situ spectroscopic ellipsometry. It was found that all PIMs swell much more than non-microporous polystyrene and other high-performance glassy polymers reported previously. Furthermore, chemical modifications of the parent PIM-1 strongly affected the swelling magnitude. By investigating the behavior of relative refractive index, nrel, it was possible to study the interplay between micropores filling and matrix expansion. Remarkably, all studied PIMs showed a maximum in nrel at swelling of 2-2.5% indicating a threshold point above which the dissolution in the dense matrix started to dominate over sorption in the micropores. At pressures above 25 bar, all PIMs significantly plasticized in compressed CO2 and for the ones with the highest affinity to the penetrant, a liquidlike mixing typical for rubbery polymers was observed. Reduction of film thickness below 100 nm revealed pronounced nanoconfinement effects and resulted in a large swelling enhancement and a quick loss of the ultrarigid character. On the basis of the partial molar volumes of the dissolved CO2, the effective reduction of the Tg was estimated to be ∼200 °C going from 128 to 7 nm films.
CitationOgieglo W, Ghanem B, Ma X, Wessling M, Pinnau I (2018) High-Pressure CO2 Sorption in Polymers of Intrinsic Microporosity under Ultrathin Film Confinement. ACS Applied Materials & Interfaces 10: 11369–11376. Available: http://dx.doi.org/10.1021/acsami.8b01402.
SponsorsThis publication is based on work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. SEED Fund OSR-2015-SEED-2445-01.
PublisherAmerican Chemical Society (ACS)
- How Much Do Ultrathin Polymers with Intrinsic Microporosity Swell in Liquids?
- Authors: Ogieglo W, Ghanem B, Ma X, Pinnau I, Wessling M
- Issue date: 2016 Oct 6
- Mixed-Penetrant Sorption in Ultrathin Films of Polymer of Intrinsic Microporosity PIM-1.
- Authors: Ogieglo W, Furchner A, Ghanem B, Ma X, Pinnau I, Wessling M
- Issue date: 2017 Nov 2
- How Do Organic Vapors Swell Ultrathin Films of Polymer of Intrinsic Microporosity PIM-1?
- Authors: Ogieglo W, Rahimi K, Rauer SB, Ghanem B, Ma X, Pinnau I, Wessling M
- Issue date: 2017 Jul 27
- Sorption Behavior of Compressed CO2 and CH4 on Ultrathin Hybrid Poly(POSS-imide) Layers.
- Authors: Raaijmakers MJ, Ogieglo W, Wiese M, Wessling M, Nijmeijer A, Benes NE
- Issue date: 2015 Dec 9
- The fabrication of ultrathin films and their gas separation performance from polymers of intrinsic microporosity with two-dimensional (2D) and three-dimensional (3D) chain conformations.
- Authors: Benito J, Vidal J, Sánchez-Laínez J, Zornoza B, Téllez C, Martín S, Msayib KJ, Comesaña-Gándara B, McKeown NB, Coronas J, Gascón I
- Issue date: 2019 Feb 15