Cross-Linked Thermally Rearranged Poly(benzoxazole-co-imide) Membranes for Gas Separation
- Authors
- Calle, Mariola; Doherty, Cara M.; Hill, Anita J.; Lee, Young Moo
- Issue Date
- Oct-2013
- Publisher
- AMER CHEMICAL SOC
- Citation
- MACROMOLECULES, v.46, no.20, pp.8179 - 8189
- Indexed
- SCIE
SCOPUS
- Journal Title
- MACROMOLECULES
- Volume
- 46
- Number
- 20
- Start Page
- 8179
- End Page
- 8189
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/133999
- DOI
- 10.1021/ma4014115
- ISSN
- 0024-9297
- Abstract
- A novel strategy to tune the cavity size and free volume of thermally rearranged polybenzoxazole (TR-PBO) copolymer membranes by transesterification cross-linking reaction of o-hydroxy polyimide precursors with 1,4-butylene glycol in the solid state is demonstrated in this study. During the thermal rearrangement (TR) process at high temperatures, loose diester interchain cross-linkers are prone to degrade while formation of a much more rigid cross-linked structure occurs following or alongside the imide-to-benzoxazole rearrangement. As a result, a synergistic effect of high permeability and high selectivity appeared to be created in one step, and the newly synthesized cross-linked TR-PBO membranes exhibited outstanding gas separation performance, surpassing the so-called 2008 upper bound for CO2/CH4 separation.
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