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The effect of acid-base interaction on the thermal and transport properties of poly(etheretherketone) based composite membranes

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Abstract

Binary composite membranes were prepared by the solution casting method from sulfonated poly(etheretherketone) (SPEEK) and organic additives such as hydroxyquinolinesulfonicacid (HQS), 4-tertiary butylpyridine (TBP), imidazole and succinimide. Ternary composite membranes were prepared from SPEEK, inorganic phosphotungstic acid (PWA) and the same organic additives. The acid base interaction characteristics of the composite membranes were not observed by ATR-FTIR analysis. TGA results showed that the thermal stability of the composite membranes was enhanced in the temperature range up to about 400 °C by the addition of the organic additives. The acid-base interaction between SPEEK and the organic additives of HQS, TBP and imidazole decreased the water uptake, methanol permeability and proton conductivity of the binary and ternary composite membranes. However, the addition of succinimide did not decrease the water uptake, proton conductivity and methanol permeability of the composite membranes. The composite membranes containing succinimide made little acid-base interaction but made hydrogen bonding with SPEEK. The hydrogen bonding proved to be weaker than the acid-base interaction. The selectivity of the composite membranes increased by the addition of PWA, and the selectivities of the composite membranes containing succinimide were higher than those of the other composite membranes.

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Authors and Affiliations

  1. Department of Chemical Engineering, Sun-Moon University, 100 Galsan-ri, Tangjeong-myun, Asan City, Chungnam, 336-708, Korea

    Bishnu Sharma Kandel, Tongzhai Gao & Sae-Joong Oh

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  1. Bishnu Sharma Kandel
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  2. Tongzhai Gao
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  3. Sae-Joong Oh
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Correspondence to Sae-Joong Oh.

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Kandel, B.S., Gao, T. & Oh, SJ. The effect of acid-base interaction on the thermal and transport properties of poly(etheretherketone) based composite membranes. Korean J. Chem. Eng. 27, 1581–1591 (2010). https://doi.org/10.1007/s11814-010-0244-1

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  • DOI: https://doi.org/10.1007/s11814-010-0244-1

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