Equilibrium and transient sorption of vapours and gases in the polymer of intrinsic microporosity PIM-1

Vopička, Ondřej; Friess, Karel; Hynek, Vladimı́r; Sysel, Petr; Zgažar, Miroslav; Šı́pek, Milan; Pilnáček, Kryštof; Lanč, Marek; Jansen, Johannes C.; Mason, Christopher R.; Budd, Peter M.

doi:10.1016/j.memsci.2013.01.040

Cited by 80 publications

(80 citation statements)

References 67 publications

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“…(1) was used together with the sorption model named after Guggenheim, Anderson and de Boer, which is usually abbreviated as the GAB model [7,[48][49][50]. The thermodynamic Fick's second law then has the form…”

Section: Permeation Experimentsmentioning

confidence: 99%

“…However, PIMs also exhibit two quite challenging issues. The first one is their very complex transport behaviour [7]. For example, their transient sorption kinetics cannot be described by the commonly used Fick's second law of diffusion.…”

mentioning

confidence: 99%

“…In this work, PIM-1 [3] and PIM-EA-TB [5] (see Figure 1) were chosen from the family of polymers of intrinsic microporosity. PIM-1 is an archetypal polymer, which was the first prepared PIM and is currently the most studied one [3,7,[9][10][11][12][33][34][35]. PIM-EA-TB was chosen because of its unique properties, especially for its gas separation ability [5].…”

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confidence: 99%

“…For PIM-1, the coefficients were found in the literature [7]. Those for PIM-EA-TB were calculated from the experimentally determined sorption isotherm, which was measured using the same gravimetric apparatus and at the same conditions as in the literature [7].…”

mentioning

confidence: 99%

“…Those for PIM-EA-TB were calculated from the experimentally determined sorption isotherm, which was measured using the same gravimetric apparatus and at the same conditions as in the literature [7]. Hence, we only state the resulting sorption plot (see Figure 5 and Table A.3) and the coefficients of Eq.…”

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confidence: 99%

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Aging of polymers of intrinsic microporosity tracked by methanol vapour permeation

Pilnáček

Vopička

Lanč

et al. 2016

Journal of Membrane Science

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The initially very promising transport properties of glassy high free volume polymers deteriorate rapidly over time. In this work, we focused on this aging phenomenon in two polymers of intrinsic microporosity (PIMs), namely PIM-1 and PIM-EA-TB. To identify the main mechanisms involved, we studied the time-declines of permeability and diffusivity of methanol vapours in flat membranes with approximately equal thicknesses. The permeation measurements were carried out using a continuous flow permeation method with carrier gas, where the methanol vapours were held at constant activity 0.2 at 25°C. Two different experimental modes were used: (i) continuous experiments that consisted of one long experiment with a duration of over 650 hours for each polymer and (ii) momentary experiments that consisted of a vast number of short (ca. 6 hours) consecutive measurements of transient permeation. The observed decreases of methanol permeability due to aging were more intense in the case of continuous mode for both polymers. In other words, the aging was ca.

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Section: Permeation Experimentsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Aging of polymers of intrinsic microporosity tracked by methanol vapour permeation

Pilnáček

Vopička

Lanč

et al. 2016

Journal of Membrane Science

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Polydimethylsiloxane/postmodified MIL‐53 composite layer coated on asymmetric hollow fiber membrane for improving gas separation performance

Zhu

Xiao

Wang

et al. 2017

J of Applied Polymer Sci

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Composite layer containing postmodified MIL‐53 (P‐MIL‐53) was exploited to be coated on as‐fabricated asymmetric hollow fiber membrane for improving gas separation performance. The morphology and pore size distribution of P‐MIL‐53 particles were characterized by SEM and N2 adsorption isotherm. The EDX mapping and FTIR spectra were performed to confirm the presence of P‐MIL‐53 deposited on the outer surface of hollow fiber membranes. The results of pure gas permeation measurement indicated that incorporation of P‐MIL‐53 particles in coating layer could improve permeation properties of hollow fiber membranes. By varying coating times and P‐MIL‐53 content, the membrane coated with PDMS/15%P‐MIL‐53 composite by three times achieved best performance. Compared to pure PDMS coated membrane, CO2 permeance was enhanced from 29.96 GPU to 40.24 GPU and ideal selectivity of CO2/N2 and CO2/CH4 also increased from 23.28 and 26.95 to 28.08 and 32.03, respectively. The gas transport through composite membrane was governed by solution‐diffusion mechanism and CO2 preferential adsorption of P‐MIL‐53 contributed to considerable increase of CO2 solubility resulting in accelerated permeation rate. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44999.

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Sorption of vapors in methanol soaked and in thermally annealed Matrimid® films

Vopička,

Dendisová,

Sysel

et al. 2023

J of Applied Polymer Sci

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Matrimid® shows well separated sub‐glass transitions and substantial entrapment of dichloromethane (DCM) in the solution‐cast films. The entrapped DCM was removed by soaking the polymer in the excess of liquid methanol followed either by thermal annealing (vacuum at 200°C) or by the desorption at mild conditions. These physical treatments influenced the sorption kinetics and even the sorption isotherms for vapors of DCM, methanol (MeOH) and acetonitrile (MeCN) at 35.0°C. The sorption isotherms for the thermally annealed Matrimid® were shifted to those for the methanol‐soaked Matrimid® upon its exposure to sufficiently saturated vapors. The physical treatments changed the β sub‐glass transition of the polymer, and did not cause changes in the chemical composition and microstructure as sensed using ATR‐FTIR and SEM, respectively. Relaxation of the annealed Matrimid® was achieved by its soaking in liquid MeOH and by the exposure to vapors, their threshold saturation followed the same order as diffusivity: MeOH > MeCN > DCM. Although methanol appears the least effective agent to induce the relaxation of Matrimid®, it diffuses in and desorbs from the polymer readily. Liquid MeOH and its vapor thus appear the media of choice for causing the relaxation and removal of entrapped solvents from Matrimid®.

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Equilibrium and transient sorption of vapours and gases in the polymer of intrinsic microporosity PIM-1

Cited by 80 publications

References 67 publications

Aging of polymers of intrinsic microporosity tracked by methanol vapour permeation

Aging of polymers of intrinsic microporosity tracked by methanol vapour permeation

Polydimethylsiloxane/postmodified MIL‐53 composite layer coated on asymmetric hollow fiber membrane for improving gas separation performance

Sorption of vapors in methanol soaked and in thermally annealed Matrimid® films

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