PEDOT-PSS embedded comb copolymer membranes with improved CO2 capture

Jae Hun Lee, Jung Pyo Jung, Eunji Jang, Ki Bong Lee, Yun Jeong Hwang, Byoung Koun Min, Jong Hak Kim

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT-PSS) is a widely used conductive polymer in various electronic devices. Here we report the first use of PEDOT-PSS to enhance CO2 capture performance of all-polymeric membranes. Specifically, an amphiphilic comb copolymer, i.e. poly(2-[3-(2H-benzotriazol-2-yl)-4-hydroxyphenyl] ethyl methacrylate)-poly(oxyethylene methacrylate) (PBEM-POEM or PBE), was synthesized to disperse PEDOT-PSS chains. Isolated and aggregated PEDOT-PSS transformed into an interconnected network structure upon combination with PBE, due to specific interactions. Incorporation of PEDOT-PSS generated a facile pathway for enhanced diffusive transport, resulting in improved CO2 and N2 permeability. However, CO2 permeability increased more significantly due to enhanced CO2 solubility, resulting in slight increase in CO2/N2 selectivity. The PBE membrane containing PEDOT-PSS 5 wt% showed the highest performance with a CO2 permeability of 59.6 Barrer and CO2/N2 selectivity of 77.4. The performance of PBE/PEDOT-PSS membranes was very close to the 2008 Robeson upper bound and much higher than those of PBE/PEDOT, PBE/PSS and commercial PEBAX membranes.

Original languageEnglish
Pages (from-to)21-30
Number of pages10
JournalJournal of Membrane Science
Volume518
DOIs
Publication statusPublished - 2016 Nov 15

Keywords

  • CO capture
  • Conducting polymer
  • Gas separation
  • Graft copolymer
  • Membrane

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Science(all)
  • Biochemistry
  • Filtration and Separation

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