Understanding the alkaline stability of imidazolium and benzimidazolium functionalized poly(phenylene oxide) based hydroxide exchange membranes
•Methyl imidazolium and benzimidazolium functionalized PPO membranes was prepared.•Hydroxide ionic conductivity and membrane physical properties were investigated.•Methyl imidazolium functionalized PPO mmebrane displayed excellent alkaline stability compared to benzimidazolium PPO membrane due to hy...
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| Published in: | Materials today : proceedings Vol. 51; pp. 2550 - 2555 |
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| Main Authors: | , , , , |
| Format: | Journal Article |
| Language: | English |
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Elsevier Ltd
2022
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| Abstract | •Methyl imidazolium and benzimidazolium functionalized PPO membranes was prepared.•Hydroxide ionic conductivity and membrane physical properties were investigated.•Methyl imidazolium functionalized PPO mmebrane displayed excellent alkaline stability compared to benzimidazolium PPO membrane due to hyperconjugation effect.
The imidazolium and benzimidazolium groups containing poly(phenylene oxide) (PPO) hydroxide exchange membrane were synthesized and characterized. The membranes were cast by solution casting method yielding transparent, flexible, and rigid membranes. The physical properties of the membrane, such as ion exchange capacity (IEC), water absorption, and swelling behavior, were investigated. A comparative study of imidazolium and benzimidazolium functionalized PPO membrane focusing on hydroxide conductivity, and alkaline stability was comprehensively examined. The C2 substituted methyl imidazolium membrane displayed unique morphology and conductivity of 15 mSCm−1 at 25 °C. Due to the sterically protected methyl group at the C2 position, imidazolium functionalized PPO membrane showed higher alkaline stability for 700 h. Furthermore, benzimidazolium cations would be more easily attacked by a nucleophile (OH−) than imidazolium cations, resulting in ring-opening of the heterocyclic ring. |
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| AbstractList | •Methyl imidazolium and benzimidazolium functionalized PPO membranes was prepared.•Hydroxide ionic conductivity and membrane physical properties were investigated.•Methyl imidazolium functionalized PPO mmebrane displayed excellent alkaline stability compared to benzimidazolium PPO membrane due to hyperconjugation effect.
The imidazolium and benzimidazolium groups containing poly(phenylene oxide) (PPO) hydroxide exchange membrane were synthesized and characterized. The membranes were cast by solution casting method yielding transparent, flexible, and rigid membranes. The physical properties of the membrane, such as ion exchange capacity (IEC), water absorption, and swelling behavior, were investigated. A comparative study of imidazolium and benzimidazolium functionalized PPO membrane focusing on hydroxide conductivity, and alkaline stability was comprehensively examined. The C2 substituted methyl imidazolium membrane displayed unique morphology and conductivity of 15 mSCm−1 at 25 °C. Due to the sterically protected methyl group at the C2 position, imidazolium functionalized PPO membrane showed higher alkaline stability for 700 h. Furthermore, benzimidazolium cations would be more easily attacked by a nucleophile (OH−) than imidazolium cations, resulting in ring-opening of the heterocyclic ring. |
| Author | Pranava, H.K. Rao, Anil H.N. Halashankar Swamy, M.H. Kushal, P. Murthy Shekhar, S. |
| Author_xml | – sequence: 1 givenname: Anil H.N. surname: Rao fullname: Rao, Anil H.N. email: anilraohn@sit.ac.in organization: Department of Chemistry, Siddaganga Institute of Technology, Tumakuru (Affiliated to Visvesvaraya Technological University, Belagavi) - 572103, India – sequence: 2 givenname: S. surname: Murthy Shekhar fullname: Murthy Shekhar, S. organization: Department of Chemical Engineering, Siddaganga Institute of Technology, Tumakuru (Affiliated to Visvesvaraya Technological University, Belagavi) – 572103, India – sequence: 3 givenname: M.H. surname: Halashankar Swamy fullname: Halashankar Swamy, M.H. organization: Department of Chemical Engineering, Siddaganga Institute of Technology, Tumakuru (Affiliated to Visvesvaraya Technological University, Belagavi) – 572103, India – sequence: 4 givenname: H.K. surname: Pranava fullname: Pranava, H.K. organization: Department of Chemical Engineering, Siddaganga Institute of Technology, Tumakuru (Affiliated to Visvesvaraya Technological University, Belagavi) – 572103, India – sequence: 5 givenname: P. surname: Kushal fullname: Kushal, P. organization: Department of Chemical Engineering, Siddaganga Institute of Technology, Tumakuru (Affiliated to Visvesvaraya Technological University, Belagavi) – 572103, India |
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| Cites_doi | 10.1039/C4EE01303D 10.1021/cm400468u 10.1073/pnas.0810041106 10.1016/j.jpowsour.2017.06.047 10.1016/j.memsci.2013.04.059 10.1016/j.memsci.2020.118844 10.1016/j.memsci.2018.04.027 10.1016/j.memsci.2011.12.041 10.1016/j.electacta.2021.138919 10.1016/j.polymer.2012.11.023 10.1016/j.jpowsour.2019.227021 10.1021/ma100260a |
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| Keywords | Hydroxide exchange membranes Alkaline stability Benzimidazolium Methyl imidazolium |
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| Title | Understanding the alkaline stability of imidazolium and benzimidazolium functionalized poly(phenylene oxide) based hydroxide exchange membranes |
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