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Synthesis and characterization of poly(styrene sulfonic acid-co-1-vinylimidazole-co-styrene) and its blends with poly(vinyl chloride) as proton conducting membranes

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Abstract

The development of proton conducting membranes based on poly(styrene sulfonic acid-co-1-vinylimidazole-co-styrene) (PSSA-co-PVIm-co-PS)/poly(vinyl chloride) (PVC) blends is firstly reported. PSSA-co-PVIm-co-PS with three different terpolymer compositions were synthesized via conventional free radical polymerization by varying styrene feed. Successful syntheses were confirmed by 1H-nuclear magnetic resonance spectroscopy (1H-NMR), elemental analysis, and Fourier transform infrared spectroscopy (FTIR). Hydrolytically stable PSSA-co-PVIm-co-PS/PVC blend membranes were prepared via solution-cast method. Scanning electron microscopy (SEM) images along with two glass transition temperatures observed from differential scanning calorimetry (DSC) suggested immiscible polymer blends. Water uptake and ion exchange capacity (IEC) were found to decrease with increasing PS content in terpolymer. All blend membranes had high thermal decomposition onsets of 230 °C. The blends demonstrated high storage moduli at room temperature and high oxidative stability. Proton conductivity at 25 °C of membranes equilibrated with water vapor was found to depend on PS content, and a maximum conductivity of 7.8 × 10−5 S/cm was achieved from 1:1:4/PVC blend membrane. For dry membranes, the effect of PS amount on proton conduction was not clearly observed at elevated temperatures (100–120 °C).

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Acknowledgements

This work was supported by the Nanotechnology Center (NANOTEC), NSTDA, Ministry of Science and Technology, Thailand, through its program of Center of Excellence Network, National Research University Project of Thailand, Office of the Higher Education Commission, through the Advanced Functional Materials Cluster of Khon Kaen University (KKU), Integrated Nanotechnology Research Center at KKU, and the Center for Innovation in Chemistry (PERCH-CIC), Office of the Higher Education Commission, Ministry of Education. The authors gratefully acknowledge P. Thongbai for help with conductivity measurement.

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  1. Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Materials Chemistry Research Center, Khon Kaen University, Khon Kaen, 40002, Thailand

    Chonnakarn Panawong & Surangkhana Martwiset

  2. Nanotec-KKU Center of Excellence on Advanced Nanomaterials for Energy Production and Storage, Khon Kaen, Thailand

    Chonnakarn Panawong & Surangkhana Martwiset

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  1. Chonnakarn Panawong
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Correspondence to Surangkhana Martwiset.

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Panawong, C., Martwiset, S. Synthesis and characterization of poly(styrene sulfonic acid-co-1-vinylimidazole-co-styrene) and its blends with poly(vinyl chloride) as proton conducting membranes. Polym. Bull. 75, 3843–3858 (2018). https://doi.org/10.1007/s00289-017-2240-7

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  • DOI: https://doi.org/10.1007/s00289-017-2240-7

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