Highly permeable polyimides incorporating Troger's base (TB) units for gas separation membranes
- Authors
- Hu, Xiaofan; Lee, Won Hee; Bae, Joon Yong; Zhao, Jiayi; Kim, Ju Sung; Wang, Zhen; Yan, Jingling; Lee, Young Moo
- Issue Date
- Dec-2020
- Publisher
- ELSEVIER
- Keywords
- Polyimides; Troger' s base (TB); TB polymerization; Gas separation membranes; Microporosity
- Citation
- JOURNAL OF MEMBRANE SCIENCE, v.615, pp.1 - 10
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MEMBRANE SCIENCE
- Volume
- 615
- Start Page
- 1
- End Page
- 10
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/133922
- DOI
- 10.1016/j.memsci.2020.118533
- ISSN
- 0376-7388
- Abstract
- Two novel polyimides incorporating Troger's Base (TB) units, Bio-PITB-1 and Bio-PITB-2, were facilely synthesized from lignin-based imide-containing diamines via TB polymerization. The polymers exhibited excellent thermal stability, finely tuned microporous structures with high BET surface areas (-569 m(2) g(-1)), high fractional free volumes (similar to 0.224), and appropriate inter-chain distances (similar to 0.68 and similar to 0.38 nm). Mechanically tough BioPITB membranes were successfully achieved due to their high molecular weights (-1.24 x 10(5) g mol(-1)) and good solubility in organic solvents. Bio-PITBs presented superior gas transport properties with improved gas permeability compared to the previously reported PI-TBs as well as Bio-TBPIs prepared from the same lignin based dianhydrides but different synthetic routes. As a result, Bio-PITBs located near the 2008 upper bounds in H-2/CH4, H-2/N-2, and CO2/CH4 gas pairs with H-2 and CO2 permeabilities over 1000 Barrer. Furthermore, the effects of membrane drying protocols and physical aging on gas transport behaviors of Bio-PITBs were investigated.
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