Synthesis and gas permeation properties of amphiphilic graft copolymer membranes

Sung Hoon Ahn, Jin Ah Seo, Jong Hak Kim, Youngdeok Ko, Seong Uk Hong

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35 Citations (Scopus)

Abstract

Amphiphilic graft copolymers comprising poly(vinyl chloride) (PVC) main chains and poly(oxyethylene methacrylate) (POEM) side chains, i.e. PVC-g-POEM, were synthesized via atom transfer radical polymerization (ATRP) using direct initiation of the secondary chlorines of PVC. Successful synthesis of the graft copolymer was confirmed using 1H NMR and FT-IR spectroscopy. TEM and DSC analysis revealed the well-defined microphase-separated structure of the graft copolymer into hydrophobic PVC and hydrophilic POEM domains. All the membranes exhibited amorphous structures and the intersegmental d-spacing were increased with the grafting degree, as characterized by XRD analysis. Permeation experimental results using a CO2/N2 (50/50) mixture indicated that as an amount of POEM in a copolymer increased, CO2 permeability increased dramatically without the sacrifice of selectivity. For example, the CO2 permeability [1 × 10-8 cm3(STP) cm/cm2 s cmHg (100 Barrer)] of PVC-g-POEM with 70 wt% of POEM at 25 °C was about 70 times higher than that of the pure PVC membrane [1.45 × 10-10 cm3(STP) cm/cm2 s cmHg (1.45 Barrer)].

Original languageEnglish
Pages (from-to)128-133
Number of pages6
JournalJournal of Membrane Science
Volume345
Issue number1-2
DOIs
Publication statusPublished - 2009 Dec 1

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All Science Journal Classification (ASJC) codes

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

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