Preparation and characterization of proton-conducting crosslinked diblock copolymer membranes

Do Kyoung Lee, Yong Woo Kim, Jin Kyu Choi, Byoung Ryul Min, Jong Hak Kim

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The synthesis and properties of crosslinked diblock copolymers for use as proton-conducting membranes are presented. A polystyrene-b-poly(hydroxyl ethyl methacrylate) diblock copolymer at 56: 44 wt % was sequentially synthesized via atom transfer radical polymerization. The poly(hydroxyl ethyl methacrylate) (PHEMA) block was thermally crosslinked by sulfosuccinic acid (SA) via the esterification reaction between -OH of PHEMA and -COOH of SA. Proton nuclear magnetic resonance and Fourier transfer infrared spectra revealed the successful synthesis of the diblock copolymer and the crosslinking reaction under the thermal condition of 120°C for 1 h. The ion-exchange capacity continuously increased from 0.25 to 0.98 mequiv/g with increasing SA concentration because of the increasing number of charged groups in the membrane. However, the water uptake increased up to an SAof 7.6 wt %, above which it decreased monotonically (maximum water uptake ∼ 27.6%). The membrane also exhibited a maximum proton conductivity of 0.045 S/cm at an SA concentration of 15.2 wt %. The maximum behavior of the water uptake and proton conductivity with respect to the SA concentration was considered to be due to a competitive effect between the increase of ionic sites and the crosslinking reaction according to the SA concentration. All the membranes were thermally quite stable at least up to 250°C, presumably because of the block-copolymer-based, crosslinked structure of the membranes.

Original languageEnglish
Pages (from-to)819-824
Number of pages6
JournalJournal of Applied Polymer Science
Volume107
Issue number2
DOIs
Publication statusPublished - 2008 Jan 15

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Block copolymers
Protons
Membranes
Methacrylates
Acids
Hydroxyl Radical
Proton conductivity
Crosslinking
Water
Nuclear magnetic resonance
Atom transfer radical polymerization
Polystyrenes
Esterification
thiosuccinic acid
Ion exchange
Infrared radiation

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

Cite this

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abstract = "The synthesis and properties of crosslinked diblock copolymers for use as proton-conducting membranes are presented. A polystyrene-b-poly(hydroxyl ethyl methacrylate) diblock copolymer at 56: 44 wt {\%} was sequentially synthesized via atom transfer radical polymerization. The poly(hydroxyl ethyl methacrylate) (PHEMA) block was thermally crosslinked by sulfosuccinic acid (SA) via the esterification reaction between -OH of PHEMA and -COOH of SA. Proton nuclear magnetic resonance and Fourier transfer infrared spectra revealed the successful synthesis of the diblock copolymer and the crosslinking reaction under the thermal condition of 120°C for 1 h. The ion-exchange capacity continuously increased from 0.25 to 0.98 mequiv/g with increasing SA concentration because of the increasing number of charged groups in the membrane. However, the water uptake increased up to an SAof 7.6 wt {\%}, above which it decreased monotonically (maximum water uptake ∼ 27.6{\%}). The membrane also exhibited a maximum proton conductivity of 0.045 S/cm at an SA concentration of 15.2 wt {\%}. The maximum behavior of the water uptake and proton conductivity with respect to the SA concentration was considered to be due to a competitive effect between the increase of ionic sites and the crosslinking reaction according to the SA concentration. All the membranes were thermally quite stable at least up to 250°C, presumably because of the block-copolymer-based, crosslinked structure of the membranes.",
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Preparation and characterization of proton-conducting crosslinked diblock copolymer membranes. / Lee, Do Kyoung; Kim, Yong Woo; Choi, Jin Kyu; Min, Byoung Ryul; Kim, Jong Hak.

In: Journal of Applied Polymer Science, Vol. 107, No. 2, 15.01.2008, p. 819-824.

Research output: Contribution to journalArticle

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AB - The synthesis and properties of crosslinked diblock copolymers for use as proton-conducting membranes are presented. A polystyrene-b-poly(hydroxyl ethyl methacrylate) diblock copolymer at 56: 44 wt % was sequentially synthesized via atom transfer radical polymerization. The poly(hydroxyl ethyl methacrylate) (PHEMA) block was thermally crosslinked by sulfosuccinic acid (SA) via the esterification reaction between -OH of PHEMA and -COOH of SA. Proton nuclear magnetic resonance and Fourier transfer infrared spectra revealed the successful synthesis of the diblock copolymer and the crosslinking reaction under the thermal condition of 120°C for 1 h. The ion-exchange capacity continuously increased from 0.25 to 0.98 mequiv/g with increasing SA concentration because of the increasing number of charged groups in the membrane. However, the water uptake increased up to an SAof 7.6 wt %, above which it decreased monotonically (maximum water uptake ∼ 27.6%). The membrane also exhibited a maximum proton conductivity of 0.045 S/cm at an SA concentration of 15.2 wt %. The maximum behavior of the water uptake and proton conductivity with respect to the SA concentration was considered to be due to a competitive effect between the increase of ionic sites and the crosslinking reaction according to the SA concentration. All the membranes were thermally quite stable at least up to 250°C, presumably because of the block-copolymer-based, crosslinked structure of the membranes.

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