Proton conducting crosslinked membranes by polymer blending of triblock copolymer and poly(vinyl alcohol)

Do Kyoung Lee, Jung Tae Park, Jin Kyu Choi, Dong Kyu Roh, Jung Hyun Lee, Yong-Gun Shul, Jong Hak Kim

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Proton conducting crosslinked membranes were prepared using polymer blends of polystyrene-b-poly(hydroxyethyl acrylate)-b-poly(styrene sulfonic acid) (PS-b-PHEA-b-PSSA) and poly(vinyl alcohol) (PVA). PS-b-PHEA-b-PSSA triblock copolymer at 28:21:51 wt% was synthesized sequentially using atom transfer radical polymerization (ATRP). FT-IR spectroscopy showed that after thermal (120 °C, 2 h) and chemical (sulfosuccinic acid, SA) treatments of the membranes, the middle PHEA block of the triblock copolymer was crosslinked with PVA through an esterification reaction between the -OH group of the membrane and the -COOH group of SA. The ion exchange capacity (IEC) decreased from 1.56 to 0.61 meq/g with increasing amount of PVA. Therefore, the proton conductivity at room temperature decreased from 0.044 to 0.018 S/cm. However, the introduction of PVA resulted in a decrease in water uptake from 87.0 to 44.3%, providing good mechanical properties applicable to the membrane electrode assembly (MEA) of fuel cells. Transmission electron microscopy (TEM) showed that the membrane was microphase-separated with a nanometer range with good connectivity of the SO3H ionic aggregates. The power density of a single H 2/O2 fuel cell system using the membrane with 50 wt% PVA was 230 mW/cm2 at 70 °C with a relative humidity of 100%. Therrnogravimetric analysis (TGA) also showed a decrease in the thermal stability of the membranes with increasing PVA concentration.

Original languageEnglish
Pages (from-to)549-554
Number of pages6
JournalMacromolecular Research
Volume16
Issue number6
DOIs
Publication statusPublished - 2008 Jan 1

Fingerprint

Block copolymers
Protons
Polymers
Alcohols
Membranes
Acids
Fuel cells
Styrene
Proton conductivity
Sulfonic Acids
Atom transfer radical polymerization
Polystyrenes
Esterification
Polymer blends
Infrared spectroscopy
Atmospheric humidity
Ion exchange
Thermodynamic stability
Transmission electron microscopy
Mechanical properties

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Lee, Do Kyoung ; Park, Jung Tae ; Choi, Jin Kyu ; Roh, Dong Kyu ; Lee, Jung Hyun ; Shul, Yong-Gun ; Kim, Jong Hak. / Proton conducting crosslinked membranes by polymer blending of triblock copolymer and poly(vinyl alcohol). In: Macromolecular Research. 2008 ; Vol. 16, No. 6. pp. 549-554.
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abstract = "Proton conducting crosslinked membranes were prepared using polymer blends of polystyrene-b-poly(hydroxyethyl acrylate)-b-poly(styrene sulfonic acid) (PS-b-PHEA-b-PSSA) and poly(vinyl alcohol) (PVA). PS-b-PHEA-b-PSSA triblock copolymer at 28:21:51 wt{\%} was synthesized sequentially using atom transfer radical polymerization (ATRP). FT-IR spectroscopy showed that after thermal (120 °C, 2 h) and chemical (sulfosuccinic acid, SA) treatments of the membranes, the middle PHEA block of the triblock copolymer was crosslinked with PVA through an esterification reaction between the -OH group of the membrane and the -COOH group of SA. The ion exchange capacity (IEC) decreased from 1.56 to 0.61 meq/g with increasing amount of PVA. Therefore, the proton conductivity at room temperature decreased from 0.044 to 0.018 S/cm. However, the introduction of PVA resulted in a decrease in water uptake from 87.0 to 44.3{\%}, providing good mechanical properties applicable to the membrane electrode assembly (MEA) of fuel cells. Transmission electron microscopy (TEM) showed that the membrane was microphase-separated with a nanometer range with good connectivity of the SO3H ionic aggregates. The power density of a single H 2/O2 fuel cell system using the membrane with 50 wt{\%} PVA was 230 mW/cm2 at 70 °C with a relative humidity of 100{\%}. Therrnogravimetric analysis (TGA) also showed a decrease in the thermal stability of the membranes with increasing PVA concentration.",
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Proton conducting crosslinked membranes by polymer blending of triblock copolymer and poly(vinyl alcohol). / Lee, Do Kyoung; Park, Jung Tae; Choi, Jin Kyu; Roh, Dong Kyu; Lee, Jung Hyun; Shul, Yong-Gun; Kim, Jong Hak.

In: Macromolecular Research, Vol. 16, No. 6, 01.01.2008, p. 549-554.

Research output: Contribution to journalArticle

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T1 - Proton conducting crosslinked membranes by polymer blending of triblock copolymer and poly(vinyl alcohol)

AU - Lee, Do Kyoung

AU - Park, Jung Tae

AU - Choi, Jin Kyu

AU - Roh, Dong Kyu

AU - Lee, Jung Hyun

AU - Shul, Yong-Gun

AU - Kim, Jong Hak

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N2 - Proton conducting crosslinked membranes were prepared using polymer blends of polystyrene-b-poly(hydroxyethyl acrylate)-b-poly(styrene sulfonic acid) (PS-b-PHEA-b-PSSA) and poly(vinyl alcohol) (PVA). PS-b-PHEA-b-PSSA triblock copolymer at 28:21:51 wt% was synthesized sequentially using atom transfer radical polymerization (ATRP). FT-IR spectroscopy showed that after thermal (120 °C, 2 h) and chemical (sulfosuccinic acid, SA) treatments of the membranes, the middle PHEA block of the triblock copolymer was crosslinked with PVA through an esterification reaction between the -OH group of the membrane and the -COOH group of SA. The ion exchange capacity (IEC) decreased from 1.56 to 0.61 meq/g with increasing amount of PVA. Therefore, the proton conductivity at room temperature decreased from 0.044 to 0.018 S/cm. However, the introduction of PVA resulted in a decrease in water uptake from 87.0 to 44.3%, providing good mechanical properties applicable to the membrane electrode assembly (MEA) of fuel cells. Transmission electron microscopy (TEM) showed that the membrane was microphase-separated with a nanometer range with good connectivity of the SO3H ionic aggregates. The power density of a single H 2/O2 fuel cell system using the membrane with 50 wt% PVA was 230 mW/cm2 at 70 °C with a relative humidity of 100%. Therrnogravimetric analysis (TGA) also showed a decrease in the thermal stability of the membranes with increasing PVA concentration.

AB - Proton conducting crosslinked membranes were prepared using polymer blends of polystyrene-b-poly(hydroxyethyl acrylate)-b-poly(styrene sulfonic acid) (PS-b-PHEA-b-PSSA) and poly(vinyl alcohol) (PVA). PS-b-PHEA-b-PSSA triblock copolymer at 28:21:51 wt% was synthesized sequentially using atom transfer radical polymerization (ATRP). FT-IR spectroscopy showed that after thermal (120 °C, 2 h) and chemical (sulfosuccinic acid, SA) treatments of the membranes, the middle PHEA block of the triblock copolymer was crosslinked with PVA through an esterification reaction between the -OH group of the membrane and the -COOH group of SA. The ion exchange capacity (IEC) decreased from 1.56 to 0.61 meq/g with increasing amount of PVA. Therefore, the proton conductivity at room temperature decreased from 0.044 to 0.018 S/cm. However, the introduction of PVA resulted in a decrease in water uptake from 87.0 to 44.3%, providing good mechanical properties applicable to the membrane electrode assembly (MEA) of fuel cells. Transmission electron microscopy (TEM) showed that the membrane was microphase-separated with a nanometer range with good connectivity of the SO3H ionic aggregates. The power density of a single H 2/O2 fuel cell system using the membrane with 50 wt% PVA was 230 mW/cm2 at 70 °C with a relative humidity of 100%. Therrnogravimetric analysis (TGA) also showed a decrease in the thermal stability of the membranes with increasing PVA concentration.

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