Selective gas transfer through binary polymeric systems based on block-copolymers

Beckman, I.N.; Teplyakov, V. V.

doi:10.1016/j.cis.2014.10.004

Cited by 19 publications

(13 citation statements)

References 32 publications

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“…where P A and P B are permeability coefficients of gases In the case of PMP as two-phase system where the transport process occurs in both phases which can also exchange the diffusant, the gas transport can be described by a system of equations of dissociative diffusion [13,14]:…”

Section: Theoretical Approachmentioning

confidence: 99%

“…For the case when the thickness of a membrane is substantially larger than the particle dimensions of the dispersion phase, or more strictly speaking, when the rate of migration of molecule through the interphase boundary substantially higher than the overall rate of diffusion, the flux of the penetrant through the twophase system can be described by a classical equation [14]:…”

Section: Theoretical Approachmentioning

confidence: 99%

“…For thin membranes, if the particle dimensions of the dispersed inclusions are comparable with the membrane thickness, two fluxes are observed experimentally and the kinetics is described by two diffusion coefficients D 1 and D 2 [14]. If the particle dimensions of the dispersed phase are much smaller than the membrane thickness, the kinetics is described by equation (4) with a single effective diffusion coefficient that can be considered as an integral (effective) parameter of the entire two-phase system.…”

Section: Theoretical Approachmentioning

confidence: 99%

“…Assuming that equation (7) is correct and S eff is S a . (gas solubility in amorphous phase as the dispersion media forming the surface of a polymeric film), it is possible to estimate D eff of PMP as dispersion [14]:…”

Section: Theoretical Approachmentioning

confidence: 99%

“…The gas transport theory in two-phase systems outlined in [10] has mostly been developed in the 90s [11][12][13]. One of the more recent publications is [14].…”

Section: Introductionmentioning

confidence: 99%

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Diffusion of C1-C3 Alkanes in Semicrystalline Poly(4-Methyl-1- Pentene) as a Two-Phase Polymeric System

Teplyakov¹

2017

Int. J. Membrane Sci. Techno.

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Poly(4-methyl-1-pentene) (PMP) is using up to now as the hollow fiber air separation membranes. This polymer with good resistance to organics attack can be prospective for separation of lower hydrocarbons.An attempt for the theoretical consideration and experimental study of the C1-C3 alkanes diffusion in poly(4-methyl-1pentene) (PMP) as a binary system in the temperature range from 253,K to 353, K covering the glass transition region of PMP (~ 303, K) is carried out in this work. The permeability of CH4, C2H6, C3H8 has been measured by the permeability differential method under the partial pressure drop across the membrane 1 bar with the gas chromatography analysis of the permeate flux. The diffusion coefficients have been calculated from the experimental differential permeability curves by using linearization method developed earlier. Novelty of results is that at temperatures below Tg PMP can be considered as a single-phase system from the gas transfer point of view. At the temperatures above Tg PMP can be considered as a two-phase medium with diffusion coefficients of C1-C3 alkanes in amorphous (Da) and crystalline phases (Dc) (Da>Dc) which differ by not more than an one order of magnitude. For the first time it is shown that the diffusivity of C1-C3 alkanes in amorphous and crystalline PMP phases is decreasing in accordance with sequence DCH4 >DC2H6 >DC3H8. A certain scatter of the PMP data published in the literature was noted. Obtained data can be relatively compared with published ones only for methane: for virgin PMP films we obtained PCH4 = 16.7 Barrer; it is known for the extrusion PMP films that PCH4 = 14.6 -19.8 Barrer, for casted PMP films PCH4 = 0.4 -1.2 Barrer. The values for ethane and propane in crystalline phase of PMP are obtained for the first time. Evaluation of permeability through crystalline phase at temperature 313,K shows that PC2H6 = 15 Barrer; PC3H8 = 5 Barrer. For real estimation of the separation efficiency PMP it is needed an additional research with taking into account the crystallinity and temperature dependences for diffusivity based on results of this study.

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Section: Theoretical Approachmentioning

confidence: 99%

Section: Theoretical Approachmentioning

confidence: 99%

Section: Theoretical Approachmentioning

confidence: 99%

Section: Theoretical Approachmentioning

confidence: 99%

“…The gas transport theory in two-phase systems outlined in [10] has mostly been developed in the 90s [11][12][13]. One of the more recent publications is [14].…”

Section: Introductionmentioning

confidence: 99%

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Diffusion of C1-C3 Alkanes in Semicrystalline Poly(4-Methyl-1- Pentene) as a Two-Phase Polymeric System

Teplyakov¹

2017

Int. J. Membrane Sci. Techno.

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The gas permeability properties of poly(vinyltrimethylsilane) treated by low‐temperature plasma

Сырцова

Пискарев

Zinoviev

et al. 2022

J of Applied Polymer Sci

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The results of one-sided treatment of polyvinyltrimethylsilane (PVTMS) films using low-temperature air plasma are presented. The treatment was carried out at 25 C in air at a pressure in the reaction chamber of 10-25 Pa and a processing time of 10-60 s. The surface of the plasma-treated PVTMS films was analyzed by X-ray photoelectron spectroscopy and atomic force microscopy and the contact angle values determined. The effect of the plasma conditions, such as the treatment time and the pressure in the reactor chamber, on the transport properties of the modified membrane for He, O 2 , N 2 , CO 2 , and CH 4 were investigated in detail. The permeability of all plasma-treated PVTMS films for the studied gases except for He was found to decrease depending on the modification conditions, leading to an increase in selectivity for such pairs as He/CH 4 , CO 2 /CH 4 , and O 2 /N 2 . The selectivity of the modified PVTMS achieved a maximum value when the films were treated with plasma for 20-40 s at a chamber pressure of 15-20 Pa. The effective diffusion coefficients of the studied gases were obtained experimentally. It was shown that the volumetric diffusion of gases, particularly O 2 and N 2 , in PVTMS before as after plasma treatment is described by the classical diffusion equations. The theoretical approaches to the influence of boundary conditions on selective gas transfer through polymeric membrane are considered. To estimate the prospects for the long-term use of membranes based on modified PVTMS, the stability of the parameters gas permeability and selectivity of the modified samples was investigated over 9 months. It was shown that the modification of PVTMS by the method of low-temperature plasma in air is a promising method for expanding the spectrum of membrane processes based on existing commercial membranes.

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Application prospects of dense gas separation hollow fibers based on poly(4-methyl-1-pentene)

et al. 2020

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Selective gas transfer through binary polymeric systems based on block-copolymers

Cited by 19 publications

References 32 publications

Diffusion of C1-C3 Alkanes in Semicrystalline Poly(4-Methyl-1- Pentene) as a Two-Phase Polymeric System

Diffusion of C1-C3 Alkanes in Semicrystalline Poly(4-Methyl-1- Pentene) as a Two-Phase Polymeric System

The gas permeability properties of poly(vinyltrimethylsilane) treated by low‐temperature plasma

Application prospects of dense gas separation hollow fibers based on poly(4-methyl-1-pentene)

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