Wei, Haixia;
Liu, Yuan;
Yuan, Ming;
Shao, Guangran;
Lan, Yang;
Zhang, Wangqing;
(2025)
Viologen based star copolymer membranes: Preparation and application in CO2/CH4 separation.
Journal of Membrane Science
, 722
, Article 123872. 10.1016/j.memsci.2025.123872.
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Abstract
The eight-armed star copolymer of polyhedral oligomeric silsesquioxane-based poly[(n-butyl acrylate)-co-1-(2-(((2-(acryloyloxy)ethyl)carbamoyl)oxy)ethyl)-1′-methyl-viologen hexafluorophosphate] [POSS-P(BA-co-VAP)8] containing a polyhedral oligomeric silsesquioxane (POSS) core and 8 arms of viologen based ionic P(BA-co-VAP) is prepared for carbon dioxide (CO2) separation. In the eight-armed star copolymer, the POSS segment affords great convenience for synthesis of eight-armed star copolymer via reversible addition fragmentation chain transfer (RAFT) polymerization and helps to improve the mechanical strength of the polymer membrane. The poly(n-butyl acrylate) (PBA) segment is hydrophobic and has a low glass transition temperature (Tg), which helps to form star copolymer nano-assemblies and also helps to form membrane at room temperature. The ionic poly[1-(2-(((2-(acryloyloxy)ethyl)carbamoyl)oxy)ethyl)-1′-methyl-viologen hexafluorophosphate] (PVAP) segment is crucial to form nano-assemblies and reversibly adsorb and desorb CO2 and to improve CO2 permeability and CO2/CH4 permselectivity. By casting the star copolymer nano-assemblies, porous membrane with pore size around 0.2–3.9 μm is prepared, and the prepared membrane exhibits a CO2 permeability of 636.3 Barrer and a CO2/CH4 permselectivity of 22.9, which is competitive to the previously reported polymer membranes.
| Type: | Article |
|---|---|
| Title: | Viologen based star copolymer membranes: Preparation and application in CO2/CH4 separation |
| DOI: | 10.1016/j.memsci.2025.123872 |
| Publisher version: | https://doi.org/10.1016/j.memsci.2025.123872 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Viologen; star copolymer; nano-assemblies; CO2 seperation membranes |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10205610 |
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