Permeability of polyimides derived from non-coplanar diamines and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride

J. W. Xu; M. L. Chng; T. S. Chung; C. B. He; R. Wang

doi:10.1016/S0032-3861(03)00430-0

Permeability of polyimides derived from non-coplanar diamines and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride

J. W. Xu, M. L. Chng, T. S. Chung^*, C. B. He, R. Wang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

53 Scopus citations

Abstract

A series of polyimides including a non-coplanar moiety were synthesized in order to investigate the effect on gas permeability and selectivity. The gas permeation properties of He, H₂, O₂, N₂, CH₄ and CO₂ were measured using a constant-volume method. Only 6FDA-terphenyl consisting of laterally attached phenyl groups shows a substantial increase because its terphenyl moiety is a rigid structure with a high aspect ratio. The order of permeability increase from 6FDA-phenyl to 6FDA-terphenyl is consistent with the calculated fraction free volume and measured permittivity. It is observed that the most gain in permeability for 6FDA-terphenyl polyimide arises from the enhancement in apparent diffusion coefficient, while the permeability increase for 6FDA-biphenyl is mainly due to the increase in solubility. A relationship of diffusivity vs. gas penetrant size as well as gas solubility vs. critical temperature of gas penetrant was also investigated.

Original language	English (US)
Pages (from-to)	4715-4721
Number of pages	7
Journal	Polymer
Volume	44
Issue number	16
DOIs	https://doi.org/10.1016/S0032-3861(03)00430-0
State	Published - Jul 10 2003
Externally published	Yes

Keywords

6FDA-polyimide
Gas separation
Permeability

ASJC Scopus subject areas

Materials Chemistry
Polymers and Plastics
Organic Chemistry

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10.1016/S0032-3861(03)00430-0

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title = "Permeability of polyimides derived from non-coplanar diamines and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride",

abstract = "A series of polyimides including a non-coplanar moiety were synthesized in order to investigate the effect on gas permeability and selectivity. The gas permeation properties of He, H2, O2, N2, CH4 and CO2 were measured using a constant-volume method. Only 6FDA-terphenyl consisting of laterally attached phenyl groups shows a substantial increase because its terphenyl moiety is a rigid structure with a high aspect ratio. The order of permeability increase from 6FDA-phenyl to 6FDA-terphenyl is consistent with the calculated fraction free volume and measured permittivity. It is observed that the most gain in permeability for 6FDA-terphenyl polyimide arises from the enhancement in apparent diffusion coefficient, while the permeability increase for 6FDA-biphenyl is mainly due to the increase in solubility. A relationship of diffusivity vs. gas penetrant size as well as gas solubility vs. critical temperature of gas penetrant was also investigated.",

keywords = "6FDA-polyimide, Gas separation, Permeability",

author = "Xu, {J. W.} and Chng, {M. L.} and Chung, {T. S.} and He, {C. B.} and R. Wang",

year = "2003",

month = jul,

day = "10",

doi = "10.1016/S0032-3861(03)00430-0",

language = "English (US)",

volume = "44",

pages = "4715--4721",

journal = "Polymer",

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number = "16",

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T1 - Permeability of polyimides derived from non-coplanar diamines and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride

AU - Xu, J. W.

AU - Chng, M. L.

AU - Chung, T. S.

AU - He, C. B.

AU - Wang, R.

PY - 2003/7/10

Y1 - 2003/7/10

N2 - A series of polyimides including a non-coplanar moiety were synthesized in order to investigate the effect on gas permeability and selectivity. The gas permeation properties of He, H2, O2, N2, CH4 and CO2 were measured using a constant-volume method. Only 6FDA-terphenyl consisting of laterally attached phenyl groups shows a substantial increase because its terphenyl moiety is a rigid structure with a high aspect ratio. The order of permeability increase from 6FDA-phenyl to 6FDA-terphenyl is consistent with the calculated fraction free volume and measured permittivity. It is observed that the most gain in permeability for 6FDA-terphenyl polyimide arises from the enhancement in apparent diffusion coefficient, while the permeability increase for 6FDA-biphenyl is mainly due to the increase in solubility. A relationship of diffusivity vs. gas penetrant size as well as gas solubility vs. critical temperature of gas penetrant was also investigated.

AB - A series of polyimides including a non-coplanar moiety were synthesized in order to investigate the effect on gas permeability and selectivity. The gas permeation properties of He, H2, O2, N2, CH4 and CO2 were measured using a constant-volume method. Only 6FDA-terphenyl consisting of laterally attached phenyl groups shows a substantial increase because its terphenyl moiety is a rigid structure with a high aspect ratio. The order of permeability increase from 6FDA-phenyl to 6FDA-terphenyl is consistent with the calculated fraction free volume and measured permittivity. It is observed that the most gain in permeability for 6FDA-terphenyl polyimide arises from the enhancement in apparent diffusion coefficient, while the permeability increase for 6FDA-biphenyl is mainly due to the increase in solubility. A relationship of diffusivity vs. gas penetrant size as well as gas solubility vs. critical temperature of gas penetrant was also investigated.

KW - 6FDA-polyimide

KW - Gas separation

KW - Permeability

UR - http://www.scopus.com/inward/record.url?scp=0038265114&partnerID=8YFLogxK

U2 - 10.1016/S0032-3861(03)00430-0

DO - 10.1016/S0032-3861(03)00430-0

M3 - Article

AN - SCOPUS:0038265114

SN - 0032-3861

VL - 44

SP - 4715

EP - 4721

JO - Polymer

JF - Polymer

IS - 16

ER -

Permeability of polyimides derived from non-coplanar diamines and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride

Abstract

Keywords

ASJC Scopus subject areas

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