Gas separation membranes made through thermal rearrangement of ortho-methoxypolyimidesopen access
- Authors
- Comesana-Gandara, Bibiana; de la Campa, Jose G.; Hernandez, Antonio; Jo, Hye Jin; Lee, Young Moo; de Abajo, Javier; Lozano, Angel E.
- Issue Date
- Nov-2015
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- RSC ADVANCES, v.5, no.124, pp.102261 - 102276
- Indexed
- SCIE
SCOPUS
- Journal Title
- RSC ADVANCES
- Volume
- 5
- Number
- 124
- Start Page
- 102261
- End Page
- 102276
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/133954
- DOI
- 10.1039/c5ra19207b
- ISSN
- 2046-2069
- 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.
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