Tailor-made polymeric membranes based on segmented block copolymers for CO2 separation

Anja Car*, Chrtomir Stropnik, Wilfredo Yave, Klaus-Victor Georg Peinemann

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

182 Scopus citations

Abstract

This paper reports the design of a tailor made polymeric membrane by using poly(ethylene oxide)-poly(butylene terephthalate) (PEO-PBT) multi-block copolymers. Their properties are controlled by the fraction of the PEO phase and its molecular weight. To explain the effect of structural changes in copolymer membranes, transport properties of four gases (CO2, H2, N2, and CH4) are discussed. After characterization, the two best copolymers are selected in order to prepare tailor made blends by adding poly(ethylene glycol) (PEG). The best selected copolymer that contained 55 wt. % of 4000 g mol-1 PEO produced a blend with high CO 2 permeability (∼190 barrer), which is twice the permeability of the pure copolymer. At the same time, an enhancement of CO2/H 2 selectivity is observed (∼13). These results suggest that the morphology of PEO-PBT can be well controlled by the addition of low-molecular-weight PEG, and consequently the gas transport properties can be tuned.

Original languageEnglish (US)
Pages (from-to)2815-2823
Number of pages9
JournalAdvanced Functional Materials
Volume18
Issue number18
DOIs
StatePublished - Sep 23 2008

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Condensed Matter Physics
  • Electrochemistry

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