Synthesis of PVA-g-POEM graft copolymers and their use in highly permeable thin film composite membranes

Do Hyun Kim, Min Su Park, Yeji Choi, Ki Bong Lee, Jong Hak Kim

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Polymeric gas separation membranes are a viable solution to mitigate greenhouse gas emissions directly linked to global warming due to their environment-friendly synthetic process and low cost. Poly(vinyl alcohol) (PVA) synthesized via non-petroleum routes is an eco-friendly material with several advantages for membrane applications such as good film-forming properties, good compatibility, and water solubility. Despite these benefits, the gas barrier property of PVA prevents its application in gas separation membranes. Therefore, we synthesized a graft copolymer consisting of PVA main chains and poly(oxyethylene methacrylate) (POEM) side chains via one-pot free radical polymerization and applied it to a highly CO2 permeable thin film composite membrane. Synthesis of the PVA-g-POEM graft copolymer was confirmed by Fourier transform infrared and proton nuclear magnetic resonance spectroscopy. X-ray diffraction and differential scanning calorimetry analyses revealed that the crystallinity of PVA-g-POEM decreased gradually with increasing POEM content, with the PVA-g-POEM graft copolymer becoming amorphous at a POEM content of 64 wt%. The composite membrane prepared with PVA-g-POEM exhibited a high CO2 permeance (347.3 GPU) and moderate selectivity (21.6 for CO2/N2). This performance is superior to other PVA-based membranes reported to date and is close to the target area for commercialization. The improved separation performance is due to the intermingled CO2-philic POEM side chains and the decrease in crystallinity of PVA.

Original languageEnglish
Pages (from-to)739-747
Number of pages9
JournalChemical Engineering Journal
Volume346
DOIs
Publication statusPublished - 2018 Aug 15

Fingerprint

Methacrylates
Composite membranes
Graft copolymers
membrane
Membranes
Thin films
Gases
crystallinity
Global warming
Free radical polymerization
Gas emissions
gas
Greenhouse gases
Nuclear magnetic resonance spectroscopy
Differential scanning calorimetry
Fourier transforms
Alcohols
Solubility
calorimetry
Nuclear magnetic resonance

Keywords

  • CO separation
  • Composite membrane
  • Graft copolymer
  • Poly(vinyl alcohol)
  • Thin film

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

Synthesis of PVA-g-POEM graft copolymers and their use in highly permeable thin film composite membranes. / Kim, Do Hyun; Park, Min Su; Choi, Yeji; Lee, Ki Bong; Kim, Jong Hak.

In: Chemical Engineering Journal, Vol. 346, 15.08.2018, p. 739-747.

Research output: Contribution to journalArticle

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