Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Rheological and Physical Properties of Sulfonated Polystyrene Ionomer Solutions and the Membranes

술폰화된 폴리스티렌 이오노머 용액과 멤브레인의 유변학적, 물리적 특성

  • Chae, Dong Wook (Department of Textile Engineering, Kyungpook National University) ;
  • Choi, Kyung Rak (Department of Organic and Nano Engineering, Hanyang University) ;
  • Kim, Byoung Chul (Department of Organic and Nano Engineering, Hanyang University)
  • Received : 2018.01.13
  • Accepted : 2018.02.21
  • Published : 2018.02.28
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Abstract

The rheological properties of sulfonated polystyrene (SPS) ionomer solutions were found to be significantly affected by solvent polarity, counterion, sulfonation level, and temperature. In the dilute concentration regime, the reduced viscosity (${\eta}_{red}$) of SPS solutions in the dimethyl sulfoxide (DMSO), which is a polar solvent, increased with decreasing concentration, whereas opposite effects were observed in low-polarity solvent tetrahydrofuran (THF). H-SPS solutions in THF showed typical shear-thinning behavior over all the measured frequencies, while solutions in DMSO showed shear-thickening behavior at low shear rates, followed by shear-thinning behavior at higher shear rates. These different behaviors might result from differences in polymer-solvent interactions and the chain conformation. SPS solutions in DMSO containing monovalent ions ($Na^+$) exhibited higher dynamic viscosity values than those with divalent ions ($Ca^{2+}$, $Mg^{2+}$) because of the different degrees of chain expansion. In DMSO, the dynamic viscosity increased with temperature, regardless of the sulfonation level and counterion. Both the proton conductivity and methanol permeability of the SPS membranes increased with increasing sulfonation level and exhibited an abrupt increase between 10 and 15 mol%, indicative of a percolation threshold.

Keywords

References

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