Gas permeability and permselectivity in polyimides based on 3,3',4,4'-biphenyltetracarboxylic dianhydride

Tanaka, Kazuhiro; Kita, Hidetoshi; Okamoto, Ken‐ichi; Nakamura, Asumaru; Kusuki, Yoshihiro

doi:10.1016/s0376-7388(00)80868-6

Cited by 87 publications

(32 citation statements)

References 24 publications

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“…BPDA-p-DDS, BPDA-dimethyl-3, 7-diamino-dibenzothiophene-5,5' -dioxide (DDBT) and PMDA-4,4'-oxydianiline (p-ODA) polyimides, having more rigid polymer backbone, display larger upward-deviation from the correlation of log DC02 with Vr -1.5 This suggests that these polyimides have a relatively large proportion of free-volume of sufficient size for a penetrant molecule to pass through. 5 The larger slope of the correlation line for a series ofPBDA-DDS polyimides may be explained by similar consideration. An alternative explanation based on difference in segmental mobility may be probable.…”

Section: Bpda-p-ddsmentioning

confidence: 90%

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Gas Permeability and Permselectivity in Homo- and Copolyimides from 3,3′,4,4′-Biphenyltetracarboxylic Dianhydride and 3,3′- and 4,4′-Diaminodiphenylsulfones

Tanaka

Kita

Okamoto

et al. 1990

Polym J

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S:The gas transport properties of homo-and copolyimides prepared from 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA) and 3,3'-and 4,4'-diaminodiphenylsulfones (m-DDS and p-DDS, respectively) are investigated. With increasing fraction of m-DDS, the density of the polyimide films increased by 1.1 % and the glass transition temperature decreased by 70 K. With increasing fraction of m-DDS, permeability coefficients P ofH2 and CO2 in the film decreased to 1/3 and 1/15, while P ratios of H2 to CO and CO2 to CH4 increased by 4.1 and 1.8 times, respectively, as a result of decrease in the diffusion coefficient and increase in diffusivity selectivity. These observations are interpreted in terms of changes in free volume fraction, distribution of size of free volume, and segmental mobility. KEY WORDS Gas Permeability / Permselectivity / Polyimide / Copolyimide / Diffusion Polyimides have attracted much attention as membrane materials applicable to gas separations.1,2 In the previous papers,3-6 we reported the effects of morphology and chemical structure on gas permeability of polyimides based on 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA). Sykes and Clair reported the gas permeabilities of various polyimides based on pyromellitic dianhydride (PMDA) and 3,3',4,4' -benzophenone tetracarboxylic dianhydride (BTDA),7 and pointed out that polyimides prepared from meta-diamines have lower permeabilities to O 2 , COz, and water vapors than the corresponding polyimides from the para-diamines. A similar tendency has also been noted for F-containing polyimides, 8 polyesters 9 ,10 and poly(sulfone-amide)s.u Since the change in the permeability depends on the chemical structure of polymers, it is interesting to elucidate the factors controlling the permeability and permselectivity of these polymers.Polym. J., Vol. 22, No.5, 1990 In the present study, gas-transport properties of homo-and co-polyimides prepared from BPDA and 3,3' -and 4,4' -diaminodiphenylsulfones (m-DDS and p-DDS, respectively) are investigated. EXPERIMENTALThe polyimides used in this study were prepared by solution condensation of BPDA with diamines, as described in the previous paper. 3 The diamines were p-DDS, m-DDS, and mixtures of p-DDS and m-DDS (7/3 and 5/5 in the p/m ratio). The films were obtained 381

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Section: Bpda-p-ddsmentioning

confidence: 90%

“…22, No. 5,1990 In the present study, gas-transport properties of homo-and co-polyimides prepared from BPDA and 3,3' -and 4,4' -diaminodiphenylsulfones (m-DDS and p-DDS, respectively) are investigated.…”

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confidence: 99%

Gas Permeability and Permselectivity in Homo- and Copolyimides from 3,3′,4,4′-Biphenyltetracarboxylic Dianhydride and 3,3′- and 4,4′-Diaminodiphenylsulfones

Tanaka

Kita

Okamoto

et al. 1990

Polym J

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“…For samples containing the dianhydride BKDA, the evolution was smaller, resulting probably from a poorer ability to produce phase segregation. Always, at low PEO contents in the copolymer, the effect of the segregation was very significant, see The permeability and selectivity of pure homopolymers were taken from literature [8,27,28]. Higher phase segregations produced an increase of the permeability to different gases.…”

Section: Gas Transport Propertiesmentioning

confidence: 99%

“…Typically these materials present a high selectivity but with a not always sufficiently high permeability [7,8]. Therefore, it would be convenient to increase permeability without losing selectivity.…”

Section: Introductionmentioning

confidence: 99%

Advances in the design of co-poly(ether-imide) membranes for CO2 separations. Influence of aromatic rigidity on crystallinity, phase segregation and gas transport

Tena

Marcos‐Fernández

Viuda

et al. 2015

European Polymer Journal

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SummaryIn our previous works, it was observed a clear relationship between the structure and the properties for different copoly(ether-imide)s, besides a good relation was found between SAXS characterization and permeability results. Here, a series of aliphatic aromatic copoly(ether-imide)s, based on an aromatic diamine (ODA), a diamine terminated poly(ethylene oxide) (PEO2000) of a molecular weight of 2000 g/mol and different aromatic dianhydrides (BPDA, BKDA (or BTDA) and PMDA )has been synthesized and characterized.The permeability for O2, N2, CO2 and CH4, increased with the rigidity of the monomers (BKDA < BPDA < PMDA), with the amount of PEO2000 in the copolymers, as well as with the increase in the temperature of treatment of the films. In this case, it was observed that when the proportion of PEO in the copolymer exceeded 50%, the permeability was similar for all samples, and the aromatic portion had no significant influence.Attending to glass transition temperature, Tg, of the aliphatic part, to its melting temperature, Tm, and to its crystallinity, segregation was better for more rigid dianhydrides at lower temperatures of treatment. Higher dianhydride rigidity produced better mechanical properties that were good but decreased a little bit when the percentage of PEO in the samples increased.Good permeselectivity compromises were attained for the CO2/N2 separation .This work gives light to design advanced materials for this separation with the increasing possibilities of controled structure and properties.

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“…Various materials including metal, 3) organic, 4) inorganic and their compounds 5) have been studied to develop high-performance membranes for hydrogen separation. Especially, amorphous silica membranes exhibit an excellent hydrogen perm-selectivity, which could be achieved by the molecular sieve-like functionality of the in-situ formed microporous amorphous silica network having a suitable mean pore diameter of approximately 0.3 nm.…”

Section: )2)mentioning

confidence: 99%

Hydrothermal stability of hydrogen permselective amorphous silica membrane synthesized by counter diffusion chemical vapor deposition method

Miyajima

Eda

Nair

et al. 2013

J. Ceram. Soc. Japan

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Hydrogen-permselective amorphous silica membranes were synthesized by the counter diffusion chemical vapor deposition (CD-CVD) method using hexamethyldisiloxane as amorphous silica source, and the effect of the mesoporous intermediate layer and the CD-CVD process temperature on the hydrothermal stability of the amorphous silica membranes were studied. A mesoporous amorphous silica intermediate layer with a mean pore size of 20 nm was synthesized on a macroporous ¡-Al 2 O 3 support. Under a hydrothermal condition at 500°C by maintaining steam-nitrogen mixed gas, the mesoporous amorphous silica intermediate layer exhibited an excellent stability, while the conventional sol gel-derived mesoporous £-Al 2 O 3 intermediate layer showed considerable degradation. The improvement in the hydrothermal stability at 500°C of the hydrogen-permselective amorphous silica membrane was successfully achieved by high-temperature synthesis at 700°C of the CD-CVD-derived microporous amorphous silica membrane on the porous ¡-Al 2 O 3 support having the hydrothermally stable amorphous silica intermediate layer. Further study on the microstructure observations and evaluation of activation energies for the hydrogen permeation through the amorphous silica membranes were performed, and the results are shown and discussed from a viewpoint to achieve further hydrothermal stability improvement for further applications to hydrogen production processes.

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Gas permeability and permselectivity in polyimides based on 3,3',4,4'-biphenyltetracarboxylic dianhydride

Cited by 87 publications

References 24 publications

Gas Permeability and Permselectivity in Homo- and Copolyimides from 3,3′,4,4′-Biphenyltetracarboxylic Dianhydride and 3,3′- and 4,4′-Diaminodiphenylsulfones

Gas Permeability and Permselectivity in Homo- and Copolyimides from 3,3′,4,4′-Biphenyltetracarboxylic Dianhydride and 3,3′- and 4,4′-Diaminodiphenylsulfones

Advances in the design of co-poly(ether-imide) membranes for CO2 separations. Influence of aromatic rigidity on crystallinity, phase segregation and gas transport

Hydrothermal stability of hydrogen permselective amorphous silica membrane synthesized by counter diffusion chemical vapor deposition method

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