Measurement of gas permeability of polymers. I. Permeabilities in constant volume/variable pressure apparatus

Pye, D. G.; Hoehn, Harvey H.; Panar, M.

doi:10.1002/app.1976.070200719

Cited by 134 publications

(51 citation statements)

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“…The pure-gas (H 2 , He, O 2 ,N 2 ,CH 4 , and CO 2 , see Table 2) permeation properties of PSf and PSf/silica MMMs were carried out using a constant volume/variable pressure method [24,25]. The gas permeability apparatus allows permeability and diffusion coefficients to be determined simultaneously by recording the increase of downstream pressure with time.…”

Section: Gas Permeation Testsmentioning

confidence: 99%

Polysulfone/silica nanoparticle mixed-matrix membranes for gas separation

Ahn

Chung

Pinnau

et al. 2008

Journal of Membrane Science

572

317

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Mixed-matrix membranes (MMMs) are based on polymeric membranes filled with inorganic particles as a means to improve their gas separation performance. In this study, MMMs were prepared from polysulfone (PSf) containing embedded nonporous fumed silica nanoparticles and the gas permeation properties of the resulting membranes were investigated. Physical properties such as film density, thermal degradation and glass transition temperature of PSf/silica MMMs were characterized. The distribution of the silica nanoparticles in PSf was observed by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Furthermore, the interface between the polymer and silica agglomerates was studied in relation with the gas transport properties. The gas permeabilities of hydrogen, helium, oxygen, nitrogen, methane, and carbon dioxide were measured as a function of silica volume fraction and diffusion and solubility coefficients were determined by the time-lag method. The effect of silica nanoparticles in PSf membranes on gas permeability is in contrast with predictions based on the Maxwell model. The O 2 permeability is approximately four times higher and CH 4 permeability is over five times greater than in a pure PSf membrane. However, the performance comprising permeability versus selectivity of PSf/silica MMMs for O 2 /N 2 and CO 2 /CH 4 follows a similar slope to that of the trade-off upper bound with increasing silica content. Crown

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Section: Gas Permeation Testsmentioning

confidence: 99%

Polysulfone/silica nanoparticle mixed-matrix membranes for gas separation

Ahn

Chung

Pinnau

et al. 2008

Journal of Membrane Science

572

317

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“…The permeabilities of pure carbon dioxide, nitrogen, helium, oxygen, methane, and ethane were measured by a constant volume variable pressure technique [31] (time-lag) in the temperature range from 30 to 90 °C and for cooling down from 90 to 30 °C. The feed pressure was 600, 450 and 350 Torr, respectively, for consecutive measurements for all gases.…”

Section: Gas Transport Propertiesmentioning

confidence: 99%

Stability of blended polymeric materials for CO2 separation

Lillepärg

Georgopanos

Shishatskiy

2014

Journal of Membrane Science

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Abstract:Blend materials of Pebax ® 1657 and low molecular weight poly(ethylene glycol)s were studied for their stability at temperature up to 90°C. It was found that a threshold of molecular weight exists at which leaching out of the low molecular weight compound from the polymer matrix becomes minimal. Poly(ethylene glycol) with methyl end groups having a molecular weight of 500 g/mol provides a blend material with a CO 2 permeability coefficient higher than in case of Polyactive™. PEBAX ® /DM500 blend can be a cheaper alternative to tailor made Polyactive™ in large scale production of thin film composite membrane.

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“…The permeability of oxygen was measured through the nanocomposite films using a home build testing chamber following the description given by Pye et al [22]. The initial oxygen pressure was 2.69 bar, room temperature (24°C) was used and the area of the films exposed to the oxygen flow had a diameter of 36 mm.…”

Section: Oxygen Permeabilitymentioning

confidence: 99%