Thermally cross-linked diaminophenylindane (DAPI) containing polyimides for membrane based gas separations

Michelle E. Dose; Malgorzata Chwatko; Ivo Hubacek; Nathaniel A. Lynd; Donald R. Paul; Benny D. Freeman

doi:10.1016/j.polymer.2018.11.050

Thermally cross-linked diaminophenylindane (DAPI) containing polyimides for membrane based gas separations

Michelle E. Dose, Malgorzata Chwatko, Ivo Hubacek, Nathaniel A. Lynd, Donald R. Paul, Benny D. Freeman

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

35 Scopus citations

Abstract

This study aims to expand structure-property relationships of diaminophenylindane (DAPI)-containing polyimides and the influence of thermal cross-linking on gas transport properties of such materials. A polyimide synthesized from hexafluoroisopropylidene diphthalic anhydride (6FDA), DAPI, and diaminobenzoic acid (DABA) in a molar ratio of 0.5/0.33/0.17, 6FDA_0.5-DAPI_0.33/DABA_0.17, was crosslinked by thermal decarboxylation. After cross-linking, pure gas permeability of 6FDA_0.5-DAPI_0.33/DABA_0.17 increased with increased cross-linking time; gas permeability increased by about 30% after cross-linking at 353 °C for 40 min. This increase in permeability correlated with an increase in d-spacing measured by wide angle x-ray scattering, suggesting an increase in inter-chain spacing upon cross-linking. Minimal changes in O₂/N₂ and N₂/CH₄ selectivities occurred with increased thermal cross-linking time for 6FDA_0.5-DAPI_0.33/DABA_0.17. However, CO₂/CH₄ and C₂H₄/C₂H₆ pure gas selectivities increased with thermal treatment, suggesting a potential narrowing of free volume distribution.

Original language	English
Pages (from-to)	16-26
Number of pages	11
Journal	Polymer
Volume	161
DOIs	https://doi.org/10.1016/j.polymer.2018.11.050
State	Published - Jan 14 2019

Bibliographical note

Publisher Copyright:
© 2018 Elsevier Ltd

Keywords

Cross-linking
Diaminophenylindane (DAPI)
Polyimides
Pure gas permeability
Thermal decarboxylation

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Materials Chemistry

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10.1016/j.polymer.2018.11.050

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@article{77d3cb8f6b774e0082bdc8a3ac075f0d,

title = "Thermally cross-linked diaminophenylindane (DAPI) containing polyimides for membrane based gas separations",

abstract = "This study aims to expand structure-property relationships of diaminophenylindane (DAPI)-containing polyimides and the influence of thermal cross-linking on gas transport properties of such materials. A polyimide synthesized from hexafluoroisopropylidene diphthalic anhydride (6FDA), DAPI, and diaminobenzoic acid (DABA) in a molar ratio of 0.5/0.33/0.17, 6FDA0.5-DAPI0.33/DABA0.17, was crosslinked by thermal decarboxylation. After cross-linking, pure gas permeability of 6FDA0.5-DAPI0.33/DABA0.17 increased with increased cross-linking time; gas permeability increased by about 30% after cross-linking at 353 °C for 40 min. This increase in permeability correlated with an increase in d-spacing measured by wide angle x-ray scattering, suggesting an increase in inter-chain spacing upon cross-linking. Minimal changes in O2/N2 and N2/CH4 selectivities occurred with increased thermal cross-linking time for 6FDA0.5-DAPI0.33/DABA0.17. However, CO2/CH4 and C2H4/C2H6 pure gas selectivities increased with thermal treatment, suggesting a potential narrowing of free volume distribution.",

keywords = "Cross-linking, Diaminophenylindane (DAPI), Polyimides, Pure gas permeability, Thermal decarboxylation",

author = "Dose, {Michelle E.} and Malgorzata Chwatko and Ivo Hubacek and Lynd, {Nathaniel A.} and Paul, {Donald R.} and Freeman, {Benny D.}",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

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doi = "10.1016/j.polymer.2018.11.050",

language = "English",

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T1 - Thermally cross-linked diaminophenylindane (DAPI) containing polyimides for membrane based gas separations

AU - Dose, Michelle E.

AU - Chwatko, Malgorzata

AU - Hubacek, Ivo

AU - Lynd, Nathaniel A.

AU - Paul, Donald R.

AU - Freeman, Benny D.

PY - 2019/1/14

Y1 - 2019/1/14

N2 - This study aims to expand structure-property relationships of diaminophenylindane (DAPI)-containing polyimides and the influence of thermal cross-linking on gas transport properties of such materials. A polyimide synthesized from hexafluoroisopropylidene diphthalic anhydride (6FDA), DAPI, and diaminobenzoic acid (DABA) in a molar ratio of 0.5/0.33/0.17, 6FDA0.5-DAPI0.33/DABA0.17, was crosslinked by thermal decarboxylation. After cross-linking, pure gas permeability of 6FDA0.5-DAPI0.33/DABA0.17 increased with increased cross-linking time; gas permeability increased by about 30% after cross-linking at 353 °C for 40 min. This increase in permeability correlated with an increase in d-spacing measured by wide angle x-ray scattering, suggesting an increase in inter-chain spacing upon cross-linking. Minimal changes in O2/N2 and N2/CH4 selectivities occurred with increased thermal cross-linking time for 6FDA0.5-DAPI0.33/DABA0.17. However, CO2/CH4 and C2H4/C2H6 pure gas selectivities increased with thermal treatment, suggesting a potential narrowing of free volume distribution.

AB - This study aims to expand structure-property relationships of diaminophenylindane (DAPI)-containing polyimides and the influence of thermal cross-linking on gas transport properties of such materials. A polyimide synthesized from hexafluoroisopropylidene diphthalic anhydride (6FDA), DAPI, and diaminobenzoic acid (DABA) in a molar ratio of 0.5/0.33/0.17, 6FDA0.5-DAPI0.33/DABA0.17, was crosslinked by thermal decarboxylation. After cross-linking, pure gas permeability of 6FDA0.5-DAPI0.33/DABA0.17 increased with increased cross-linking time; gas permeability increased by about 30% after cross-linking at 353 °C for 40 min. This increase in permeability correlated with an increase in d-spacing measured by wide angle x-ray scattering, suggesting an increase in inter-chain spacing upon cross-linking. Minimal changes in O2/N2 and N2/CH4 selectivities occurred with increased thermal cross-linking time for 6FDA0.5-DAPI0.33/DABA0.17. However, CO2/CH4 and C2H4/C2H6 pure gas selectivities increased with thermal treatment, suggesting a potential narrowing of free volume distribution.

KW - Cross-linking

KW - Diaminophenylindane (DAPI)

KW - Polyimides

KW - Pure gas permeability

KW - Thermal decarboxylation

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JO - Polymer

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ER -

Thermally cross-linked diaminophenylindane (DAPI) containing polyimides for membrane based gas separations

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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