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Gas separation membranes made through thermal rearrangement of ortho-methoxypolyimides

Title
Gas separation membranes made through thermal rearrangement of ortho-methoxypolyimides
Author
이영무
Keywords
HEXAFLUOROPROPANE DIANHYDRIDE 6FDA; TRANSPORT PROPERTIES; POLY(BENZOXAZOLE-CO-IMIDE) MEMBRANES; TR POLYMERS; NATURAL-GAS; 3,3'-DIHYDROXY-4,4'-DIAMINO-BIPHENYL HAB; OPERATING-CONDITIONS; AROMATIC POLYIMIDES; POLYBENZOXAZOLES; PERMEABILITY
Issue Date
2015-11
Publisher
ROYAL SOC CHEMISTRY
Citation
RSC ADVANCES, v. 5, NO 124, Page. 102261-102276
Abstract
ortho-Methoxypolyimides were prepared from 3,3'-dimethoxybenzidine (DMAB) and hexafluoroiso-propylidene diphthalic anhydride (6FDA). High molecular weights of the resulting polymers were achieved, and the physical properties of the materials were investigated. The polyimides exhibited excellent thermal properties and film-forming capabilities. Polyimides were treated at high temperatures to promote thermal rearrangement (TR) processes. The final composition of the TR polymers seems not to correspond to TR-polybenzoxazoles, as was the case when analogous ortho-hydroxypolyimides were exposed to similar thermal treatments. A detailed study was carried out to elucidate the actual mechanism of the thermal rearrangement, comparing ortho-hydroxypolyimides, ortho-acetylpolyimides and ortho-methoxypolyimides. Results led to the conclusion that the chemical nature of the final TR polymers attained from ortho-methoxypolyimides is complex since imide, lactam and benzoxazole groups all seem to be present after thermal treatment. Gas permeation properties exhibited by thermally treated ortho-methoxypolyimides compared well with those of other TR-PBOs, showing CO2 permeability of 540 Barrers.
URI
http://pubs.rsc.org/en/Content/ArticleLanding/2015/RA/C5RA19207B#!divAbstracthttp://hdl.handle.net/20.500.11754/28716
ISSN
2046-2069
DOI
10.1039/c5ra19207b
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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