Novel poly(silicon olefins) for gas separations

Platè, N.A.; Durgarjan, S.G.; Хотимский, В. С.; Teplyakov, V. V.; Yampolskii, Yu. P.

doi:10.1016/s0376-7388(00)85133-9

Cited by 35 publications

(13 citation statements)

References 2 publications

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“…13 The dependences of di¬usion coe¯cients (A) and permeability coe¯cients (B) coe¯-cients on fractional accessible volume. The black-painted rectangle points are taken from source [15], the white-painted rectangle points are taken from [17].…”

Section: Discussionmentioning

confidence: 99%

“…It¯rst attracted attention in the 70's as a polymer with a high relative permeability, and since then it has been widely studied [15,16]. PVTMS properties { the di®usion and permeability coe±cients -were studied in detail for a wide range of gases.…”

Section: Testing Of the Methodsmentioning

confidence: 99%

“…At the same time, if a su±ciently large number of virtual spheres are applied, the rolling-over spheres method would give satisfactory precision, but its speed would be too low. As experience has shown, only every 100 th random point hits the volume corrections area, while conditions described by (15)(16)(17) are checked for all generated points. A hybrid method, presented below, exploits the advantages of the grid method to increase the e®ectiveness of the Monte Carlo algorithm.…”

Section: A Combined Algorithm For Volume Corrections Calculationsmentioning

confidence: 99%

“…Here, the grid image Q 0 ijk is constructed and then the random points are inserted. The conditions (15)(16)(17) are checked now only for the points hitting the area Q 0 ijk , and so the speed of volume corrections computation increases signi¯cantly. As before, volume corrections are calculated by formula (13).…”

Section: A Combined Algorithm For Volume Corrections Calculationsmentioning

confidence: 99%

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Methods for the calculation of occupied volumes in glassy polymers: The lattice integration and the monte carlo methods

2003

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A new model for characterizing the free volume of a glassy polymer { gas systems is proposed. An improved method for the calculation of occupied volume per monomer unit was developed within the limits of this model. The model assumptions, error estimates and algorithm e¯ciencies are described. Using the example of polyvinyltrimethylsilane, it is shown that linear dependences of logarithms of the di¬usion and the permeability coe¯cients on speci c accessible volume for inert gases exist.

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Section: Discussionmentioning

confidence: 99%

Section: Testing Of the Methodsmentioning

confidence: 99%

Section: A Combined Algorithm For Volume Corrections Calculationsmentioning

confidence: 99%

Section: A Combined Algorithm For Volume Corrections Calculationsmentioning

confidence: 99%

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Methods for the calculation of occupied volumes in glassy polymers: The lattice integration and the monte carlo methods

2003

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“…Gas permeabilities have been shown to be significantly improved by introducing organosilanes onto the polymer main chain 3,4 and postsilylation of polymers. Trialkylsilyl groups introduced onto phenyl rings of polystyrene, 5 on the polypropyne chain, [6][7][8][9][10][11] and on the phenyl rings of poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) [12][13][14] and polysulfones [15][16][17][18] result in high gas permeability.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Polysulfones Containing Both Hexafluoroisopropylidene and Trimethylsilyl Groups as Gas Separation Membrane Materials

Dai¹,

Guiver²,

Robertson³

et al. 2004

Macromolecules

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/npsi/ctrl?action=rtdoc&an=8906267&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=8906267&lang=frAccess and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1021/ma035739i Macromolecules, 37, 4, pp. 1403Macromolecules, 37, 4, pp. -1410Macromolecules, 37, 4, pp. , 2004 Preparation and characterization of polysulfones containing both hexafluoroisopropylidene and trimethylsilyl groups as gas separation membrane materials Dai, Y.; Guiver, Michael; Robertson, Gilles; Kang, Y.; Lee, Kunchan; Jho, J. Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, Korea; and Hyperstructured Organic Materials Research Center and School of Chemical Engineering, Seoul National University, Seoul 151-744, Korea Received November 19, 2003; Revised Manuscript Received December 16, 2003 ABSTRACT: Trimethylsilylated derivatives of hexafluoropolysulfone (6FPSf) and tetramethylhexafluoropolysulfone (TM6FPSf) were prepared by reaction of lithiated polymer intermediates with halotrimethylsilane electrophiles for a membrane gas separation study to compare improvements in gas permeabilities with those of unmodified polymers. Ortho sulfone substituted 6FPSf and TM6FPSf having pendant trimethylsilyl (TMS) groups were obtained by a two-step process involving first direct lithiation of 6FPSf and TM6FPSf solutions with n-butyllithium to afford ortho sulfone dilithiated intermediates, followed by reaction with a TMS electrophile. The corresponding ortho ether 6FPSf derivative was obtained by lithiation of dibrominated 6FPSf at the bromine sites, followed by reaction with a TMS electrophile. The degree of substitution (DS) of the TMS groups was g2.0 and was dependent on the molar ratio of n-butyllithium and electrophile quantity, electrophile reactivity, and reaction conditions. Detailed structural characterization and DS of the modified polymers were obtained by nuclear magnetic resonance spectroscopy. The glass transition temperatures and thermal stabilities were determined by differential scanning calorimetry and thermogravimetric analysis, respectively. Polymer chain d-spacing was investigated using wide-angle X-ray diffraction. Polymer free volume was calculated from the polymer density and specific van der Waals volume. The polymer gas permeability coefficients (P) were measured for He, CO 2,O 2, and N2. Both CO2 and O2 permeabilities of modified 6FPSf increased by 8-9-fold (P(CO2) ) 110 barre...

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Correlation between fractional free volume and diffusivity of gas molecules in glassy polymers

Thran

Kroll

Faupel

1999

J. Polym. Sci. B Polym. Phys.

189

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Novel poly(silicon olefins) for gas separations

Cited by 35 publications

References 2 publications

Methods for the calculation of occupied volumes in glassy polymers: The lattice integration and the monte carlo methods

Methods for the calculation of occupied volumes in glassy polymers: The lattice integration and the monte carlo methods

Preparation and Characterization of Polysulfones Containing Both Hexafluoroisopropylidene and Trimethylsilyl Groups as Gas Separation Membrane Materials

Correlation between fractional free volume and diffusivity of gas molecules in glassy polymers

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