Correlation of gas permeation and free volume in new and used high free volume thin film composite membranes

Koschine, Toenjes; Rätzke, Klaus; Faupel, Franz; Khan, Muntazim Munir; Emmler, Thomas; Filiz, Volkan; Abetz, Volker; Ravelli, L.; Egger, Werner

doi:10.1002/polb.23616

Cited by 26 publications

(17 citation statements)

References 29 publications

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“…Permeabilities of four pure gases (H 2 , N 2 , O 2 , CO 2 , and CH 4 ) were measured by a pressure increase time-lag apparatus at 30 °C [20,21,22,23,24,25]. Permeability ( P ), diffusivity ( D ), solubility ( S ), and selectivity ( α i/j ) for gases i and j were determined under steady state conditions by the following equations:P=D·S=Vpl(pp2−pp1)ARTΔt[pf−(pp2+pp1)2] D=l26θ αi/j=PiPj=DiSiDjSj where Vp was the constant permeate volume, R was the gas constant, l was the film thickness, A was the effective area of the membrane, Δt was the time for the permeate pressure increase from p p 1 to p p 2 , p f was the feed pressure, and θ was the time-lag.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and Crosslinking of Polyether-Based Main Chain Benzoxazine Polymers and Their Gas Separation Performance

et al. 2018

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The poly(ethylene glycol)-based benzoxazine polymers were synthesized via a polycondensation reaction between Bisphenol-A, paraformaldehyde, and poly(ether diamine)/(Jeffamine®). The structures of the polymers were confirmed by proton nuclear magnetic resonance spectroscopy (1H-NMR), indicating the presence of a cyclic benzoxazine ring. The polymer solutions were casted on the glass plate and cross-linked via thermal treatment to produce tough and flexible films without using any external additives. Thermal properties and the crosslinking behaviour of these polymers were studied by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Single gas (H2, O2, N2, CO2, and CH4) transport properties of the crosslinked polymeric membranes were measured by the time-lag method. The crosslinked PEG-based polybenzoxazine membranes show improved selectivities for CO2/N2 and CO2/CH4 gas pairs. The good separation selectivities of these PEG-based polybenzoxazine materials suggest their utility as efficient thin film composite membranes for gas and liquid membrane separation technology.

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Section: Methodsmentioning

confidence: 99%

Synthesis and Crosslinking of Polyether-Based Main Chain Benzoxazine Polymers and Their Gas Separation Performance

et al. 2018

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“…High-free-volume polymers, such as polymers of intrinsic microporosity (PIMs), have attracted attention for their high gas permeabilities [ 2 , 3 ]. However, they are susceptible to physical ageing, which leads to a reduction in permeability over time [ 4 , 5 ]. The addition of an inorganic, metal-organic or organic filler to a polymer, to form a mixed matrix membrane (MMM) [ 6 ], can give synergistic improvements in the permeation properties, help to control ageing effects, and enhance the mechanical performance.…”

Section: Introductionmentioning

confidence: 99%

The influence of few-layer graphene on the gas permeability of the high-free-volume polymer PIM-1

Althumayri

Harrison

Shin

et al. 2016

Phil. Trans. R. Soc. A.

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Gas permeability data are presented for mixed matrix membranes (MMMs) of few-layer graphene in the polymer of intrinsic microporosity PIM-1, and the results compared with previously reported data for two other nanofillers in PIM-1: multiwalled carbon nanotubes functionalized with poly(ethylene glycol) (f-MWCNTs) and fused silica. For few-layer graphene, a significant enhancement in permeability is observed at very low graphene content (0.05 vol.%), which may be attributed to the effect of the nanofiller on the packing of the polymer chains. At higher graphene content permeability decreases, as expected for the addition of an impermeable filler. Other nanofillers, reported in the literature, also give rise to enhancements in permeability, but at substantially higher loadings, the highest measured permeabilities being at 1 vol.% for f-MWCNTs and 24 vol.% for fused silica. These results are consistent with the hypothesis that packing of the polymer chains is influenced by the curvature of the nanofiller surface at the nanoscale, with an increasingly pronounced effect on moving from a more-or-less spherical nanoparticle morphology (fused silica) to a cylindrical morphology (f-MWCNT) to a planar morphology (graphene). While the permeability of a high-free-volume polymer such as PIM-1 decreases over time through physical ageing, for the PIM-1/graphene MMMs a significant permeability enhancement was retained after eight months storage.

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“…A wide range of PIM-1 based composites have been reported for other applications, mostly in MMMs for gas separation application. Some examples include a combination of PIM-1 with fillers such as GO (Alberto et al, 2017), carbon nanotubes (Koschine et al, 2015), MOF-74 (Tien-Binh et al, 2016), ZIF-67 (Wu et al, 2018), ZIF-8 (Benzaqui et al, 2016), and COFs (Wu et al, 2017) MMMs. It is only recently, that there seems to be a growing interest of PIM-1 composites fabrication toward H 2 storage applications.…”

Section: Resultsmentioning

confidence: 99%

Polymer-Based Shaping Strategy for Zeolite Templated Carbons (ZTC) and Their Metal Organic Framework (MOF) Composites for Improved Hydrogen Storage Properties

et al. 2019

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Porous materials such as metal organic frameworks (MOFs), zeolite templated carbons (ZTC), and some porous polymers have endeared the research community for their attractiveness for hydrogen (H 2) storage applications. This is due to their remarkable properties, which among others include high surface areas, high porosity, tunability, high thermal, and chemical stability. However, despite their extraordinary properties, their lack of processability due to their inherent powdery nature presents a constraining factor for their full potential for applications in hydrogen storage systems. Additionally, the poor thermal conductivity in some of these materials also contributes to the limitations for their use in this type of application. Therefore, there is a need to develop strategies for producing functional porous composites that are easy-to-handle and with enhanced heat transfer properties while still retaining their high hydrogen adsorption capacities. Herein, we present a simple shaping approach for ZTCs and their MOFs composite using a polymer of intrinsic microporosity (PIM-1). The intrinsic characteristics of the individual porous materials are transferred to the resulting composites leading to improved processability without adversely altering their porous nature. The surface area and hydrogen uptake capacity for the obtained shaped composites were found to be within the range of 1,054-2,433 m 2 g −1 and 1.22-1.87 H 2 wt. %, respectively at 1 bar and 77 K. In summary, the synergistic performance of the obtained materials is comparative to their powder counterparts with additional complementing properties.

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Correlation of gas permeation and free volume in new and used high free volume thin film composite membranes

Cited by 26 publications

References 29 publications

Synthesis and Crosslinking of Polyether-Based Main Chain Benzoxazine Polymers and Their Gas Separation Performance

Synthesis and Crosslinking of Polyether-Based Main Chain Benzoxazine Polymers and Their Gas Separation Performance

The influence of few-layer graphene on the gas permeability of the high-free-volume polymer PIM-1

Polymer-Based Shaping Strategy for Zeolite Templated Carbons (ZTC) and Their Metal Organic Framework (MOF) Composites for Improved Hydrogen Storage Properties

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