期刊
POLYMER
卷 161, 期 -, 页码 16-26出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2018.11.050
关键词
Diaminophenyl indane (DAPI); Polyimides; Thermal decarboxylation; Cross-linking; Pure gas permeability
资金
- National Science Foundation Graduate Research Fellowship [DGE-1610403]
- Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences of the U.S. Department of Energy (DOE), USA [DE-FG02-02ER15362]
- National Science Foundation [CBET-1706968, EEC-1647722]
- NSF [CHE-1623211]
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 crosslinking time; gas permeability increased by about 30% after cross-linking at 353 degrees 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 O-2/N-2 and N-2/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.
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