Synthesis of amphiphilic PCZ-r-PEG nanostructural copolymers and their use in CO2/N2 separation membranes

Rajkumar Patel, Sang Jin Kim, Dong Kyu Roh, Jong Hak Kim

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Poly(ethylene glycol) (PEG) is considered a good candidate material for CO2 separation membranes due to its high affinity with CO2, but the preparation of a robust, free-standing PEG membrane is challenging. Although a crosslinking method is often used to prepare PEG membranes, it has limitations in processibility, in that it is only applicable to the coating layer. We report the synthesis of amphiphilic polycarbonate Z-r-poly(ethylene glycol) (PCZ-r-PEG) nanostructural copolymers with improved processibility and their application to CO2/N2 separation membranes. The copolymers were synthesized using bisphenol Z, triphosgene and PEG (2000g/mol) via solution polycondensation polymerization, as confirmed by Fourier transform infra-red spectroscopy (FTIR), nuclear magnetic resonance (1H-NMR) and gel permeation chromatography (GPC) analysis. Structural and morphological analysis was studied by transmission electron microscopy (TEM), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). TEM images revealed a self-assembled, microphase-separated morphology in the hydrophilic rubbery PEG domains and the hydrophobic glassy PCZ domains, which is also supported by the existence of two glass transition temperatures (Tgs) in the DSC curves. The thermal stability of the PCZ-r-PEG copolymers was less than that of the PCZ homopolymer, but was quite stable up to around 350°C. The mechanical properties of all the membranes were significant, with reduced elongation at break while the Young's modulus increased with PEG content. The PCZ-r-PEG copolymer exhibited a CO2 permeability of 50.7 Barrer (1 Barrer=1×10-10cm3(STP)cmcm-2s-1cmHg-1) and CO2/N2 selectivity of 42.25 at 35°C and 2atm, which was much greater than those of the PCZ homopolymer membrane (CO2 permeability of 2.7 Barrer, selectivity of 27).

Original languageEnglish
Pages (from-to)46-53
Number of pages8
JournalChemical Engineering Journal
Volume254
DOIs
Publication statusPublished - 2014 Oct 15

Fingerprint

polycarbonate
Polycarbonates
ethylene
Polyethylene glycols
Copolymers
membrane
Membranes
calorimetry
nuclear magnetic resonance
transmission electron microscopy
permeability
Homopolymerization
Young modulus
Differential scanning calorimetry
infrared spectroscopy
polymerization
Fourier transform
chromatography
Nuclear magnetic resonance
mechanical property

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Synthesis of amphiphilic PCZ-r-PEG nanostructural copolymers and their use in CO2/N2 separation membranes",
abstract = "Poly(ethylene glycol) (PEG) is considered a good candidate material for CO2 separation membranes due to its high affinity with CO2, but the preparation of a robust, free-standing PEG membrane is challenging. Although a crosslinking method is often used to prepare PEG membranes, it has limitations in processibility, in that it is only applicable to the coating layer. We report the synthesis of amphiphilic polycarbonate Z-r-poly(ethylene glycol) (PCZ-r-PEG) nanostructural copolymers with improved processibility and their application to CO2/N2 separation membranes. The copolymers were synthesized using bisphenol Z, triphosgene and PEG (2000g/mol) via solution polycondensation polymerization, as confirmed by Fourier transform infra-red spectroscopy (FTIR), nuclear magnetic resonance (1H-NMR) and gel permeation chromatography (GPC) analysis. Structural and morphological analysis was studied by transmission electron microscopy (TEM), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). TEM images revealed a self-assembled, microphase-separated morphology in the hydrophilic rubbery PEG domains and the hydrophobic glassy PCZ domains, which is also supported by the existence of two glass transition temperatures (Tgs) in the DSC curves. The thermal stability of the PCZ-r-PEG copolymers was less than that of the PCZ homopolymer, but was quite stable up to around 350°C. The mechanical properties of all the membranes were significant, with reduced elongation at break while the Young's modulus increased with PEG content. The PCZ-r-PEG copolymer exhibited a CO2 permeability of 50.7 Barrer (1 Barrer=1×10-10cm3(STP)cmcm-2s-1cmHg-1) and CO2/N2 selectivity of 42.25 at 35°C and 2atm, which was much greater than those of the PCZ homopolymer membrane (CO2 permeability of 2.7 Barrer, selectivity of 27).",
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Synthesis of amphiphilic PCZ-r-PEG nanostructural copolymers and their use in CO2/N2 separation membranes. / Patel, Rajkumar; Kim, Sang Jin; Roh, Dong Kyu; Kim, Jong Hak.

In: Chemical Engineering Journal, Vol. 254, 15.10.2014, p. 46-53.

Research output: Contribution to journalArticle

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AB - Poly(ethylene glycol) (PEG) is considered a good candidate material for CO2 separation membranes due to its high affinity with CO2, but the preparation of a robust, free-standing PEG membrane is challenging. Although a crosslinking method is often used to prepare PEG membranes, it has limitations in processibility, in that it is only applicable to the coating layer. We report the synthesis of amphiphilic polycarbonate Z-r-poly(ethylene glycol) (PCZ-r-PEG) nanostructural copolymers with improved processibility and their application to CO2/N2 separation membranes. The copolymers were synthesized using bisphenol Z, triphosgene and PEG (2000g/mol) via solution polycondensation polymerization, as confirmed by Fourier transform infra-red spectroscopy (FTIR), nuclear magnetic resonance (1H-NMR) and gel permeation chromatography (GPC) analysis. Structural and morphological analysis was studied by transmission electron microscopy (TEM), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). TEM images revealed a self-assembled, microphase-separated morphology in the hydrophilic rubbery PEG domains and the hydrophobic glassy PCZ domains, which is also supported by the existence of two glass transition temperatures (Tgs) in the DSC curves. The thermal stability of the PCZ-r-PEG copolymers was less than that of the PCZ homopolymer, but was quite stable up to around 350°C. The mechanical properties of all the membranes were significant, with reduced elongation at break while the Young's modulus increased with PEG content. The PCZ-r-PEG copolymer exhibited a CO2 permeability of 50.7 Barrer (1 Barrer=1×10-10cm3(STP)cmcm-2s-1cmHg-1) and CO2/N2 selectivity of 42.25 at 35°C and 2atm, which was much greater than those of the PCZ homopolymer membrane (CO2 permeability of 2.7 Barrer, selectivity of 27).

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