Anion exchange membranes of bis-imidazolium cation crosslinked poly(2,6-dimethyl-1,4- phenylene oxide) with enhanced alkaline stability

Jianhao Dong, Huanhuan Li, Xiaorui Ren, Xuefu Che, Jingshuai Yang, David Aili*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Partially crosslinked anion exchange membranes (AEMs) with imidazolium-based cationic functionalities were fabricated based on a poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) matrix. The PPO was activated by bromomethylation and functionalized with methylimidazole and 1,4-bis(imidazolyl)butane at different ratios through a gentle and facile heat curing method. The use of 1,4-bis(imidazolyl)butane resulted in a membrane with cationic functionalities incorporated in covalent crosslinks, which allowed for high ion exchange capacities (IECs) without compromising on mechanical robustness. Comprehensive characterizations were performed in terms of thermal stability, water uptake, IEC, swelling, conductivity, mechanical properties and alkaline stability to investigate the correlation of the structure and physicochemical properties. Comparing with the un-crosslinked imidazolium PPO membrane, crosslinked membranes exhibited improved mechanical robustness and alkaline stabilities. The membrane with a crosslinking degree of 10% displayed an IEC of around 1.5 mmol g−1, tensile strength of 4.1 MPa, hydroxide ion conductivity of 40.5 mS cm−1, and a retained ratio in conductivity of 40% after tolerance test of nearly 150 h in 1 mol L−1 KOH (aq.) at 60 °C.
Original languageEnglish
JournalInternational Journal of Hydrogen Energy
Volume44
Issue number39
Pages (from-to)22137-22145
ISSN0360-3199
DOIs
Publication statusPublished - 2019

Keywords

  • Anion exchange membranes
  • Alkaline stability
  • Crosslinking
  • Bis-imidazolium cation
  • Poly(2,6-dimethyl-1,4-phenylene oxide)

Cite this

Dong, Jianhao ; Li, Huanhuan ; Ren, Xiaorui ; Che, Xuefu ; Yang, Jingshuai ; Aili, David. / Anion exchange membranes of bis-imidazolium cation crosslinked poly(2,6-dimethyl-1,4- phenylene oxide) with enhanced alkaline stability. In: International Journal of Hydrogen Energy. 2019 ; Vol. 44, No. 39. pp. 22137-22145.
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title = "Anion exchange membranes of bis-imidazolium cation crosslinked poly(2,6-dimethyl-1,4- phenylene oxide) with enhanced alkaline stability",
abstract = "Partially crosslinked anion exchange membranes (AEMs) with imidazolium-based cationic functionalities were fabricated based on a poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) matrix. The PPO was activated by bromomethylation and functionalized with methylimidazole and 1,4-bis(imidazolyl)butane at different ratios through a gentle and facile heat curing method. The use of 1,4-bis(imidazolyl)butane resulted in a membrane with cationic functionalities incorporated in covalent crosslinks, which allowed for high ion exchange capacities (IECs) without compromising on mechanical robustness. Comprehensive characterizations were performed in terms of thermal stability, water uptake, IEC, swelling, conductivity, mechanical properties and alkaline stability to investigate the correlation of the structure and physicochemical properties. Comparing with the un-crosslinked imidazolium PPO membrane, crosslinked membranes exhibited improved mechanical robustness and alkaline stabilities. The membrane with a crosslinking degree of 10{\%} displayed an IEC of around 1.5 mmol g−1, tensile strength of 4.1 MPa, hydroxide ion conductivity of 40.5 mS cm−1, and a retained ratio in conductivity of 40{\%} after tolerance test of nearly 150 h in 1 mol L−1 KOH (aq.) at 60 °C.",
keywords = "Anion exchange membranes, Alkaline stability, Crosslinking, Bis-imidazolium cation, Poly(2,6-dimethyl-1,4-phenylene oxide)",
author = "Jianhao Dong and Huanhuan Li and Xiaorui Ren and Xuefu Che and Jingshuai Yang and David Aili",
year = "2019",
doi = "10.1016/j.ijhydene.2019.06.130",
language = "English",
volume = "44",
pages = "22137--22145",
journal = "International Journal of Hydrogen Energy",
issn = "0360-3199",
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Anion exchange membranes of bis-imidazolium cation crosslinked poly(2,6-dimethyl-1,4- phenylene oxide) with enhanced alkaline stability. / Dong, Jianhao ; Li, Huanhuan; Ren, Xiaorui; Che, Xuefu; Yang, Jingshuai; Aili, David.

In: International Journal of Hydrogen Energy, Vol. 44, No. 39, 2019, p. 22137-22145.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Anion exchange membranes of bis-imidazolium cation crosslinked poly(2,6-dimethyl-1,4- phenylene oxide) with enhanced alkaline stability

AU - Dong, Jianhao

AU - Li, Huanhuan

AU - Ren, Xiaorui

AU - Che, Xuefu

AU - Yang, Jingshuai

AU - Aili, David

PY - 2019

Y1 - 2019

N2 - Partially crosslinked anion exchange membranes (AEMs) with imidazolium-based cationic functionalities were fabricated based on a poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) matrix. The PPO was activated by bromomethylation and functionalized with methylimidazole and 1,4-bis(imidazolyl)butane at different ratios through a gentle and facile heat curing method. The use of 1,4-bis(imidazolyl)butane resulted in a membrane with cationic functionalities incorporated in covalent crosslinks, which allowed for high ion exchange capacities (IECs) without compromising on mechanical robustness. Comprehensive characterizations were performed in terms of thermal stability, water uptake, IEC, swelling, conductivity, mechanical properties and alkaline stability to investigate the correlation of the structure and physicochemical properties. Comparing with the un-crosslinked imidazolium PPO membrane, crosslinked membranes exhibited improved mechanical robustness and alkaline stabilities. The membrane with a crosslinking degree of 10% displayed an IEC of around 1.5 mmol g−1, tensile strength of 4.1 MPa, hydroxide ion conductivity of 40.5 mS cm−1, and a retained ratio in conductivity of 40% after tolerance test of nearly 150 h in 1 mol L−1 KOH (aq.) at 60 °C.

AB - Partially crosslinked anion exchange membranes (AEMs) with imidazolium-based cationic functionalities were fabricated based on a poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) matrix. The PPO was activated by bromomethylation and functionalized with methylimidazole and 1,4-bis(imidazolyl)butane at different ratios through a gentle and facile heat curing method. The use of 1,4-bis(imidazolyl)butane resulted in a membrane with cationic functionalities incorporated in covalent crosslinks, which allowed for high ion exchange capacities (IECs) without compromising on mechanical robustness. Comprehensive characterizations were performed in terms of thermal stability, water uptake, IEC, swelling, conductivity, mechanical properties and alkaline stability to investigate the correlation of the structure and physicochemical properties. Comparing with the un-crosslinked imidazolium PPO membrane, crosslinked membranes exhibited improved mechanical robustness and alkaline stabilities. The membrane with a crosslinking degree of 10% displayed an IEC of around 1.5 mmol g−1, tensile strength of 4.1 MPa, hydroxide ion conductivity of 40.5 mS cm−1, and a retained ratio in conductivity of 40% after tolerance test of nearly 150 h in 1 mol L−1 KOH (aq.) at 60 °C.

KW - Anion exchange membranes

KW - Alkaline stability

KW - Crosslinking

KW - Bis-imidazolium cation

KW - Poly(2,6-dimethyl-1,4-phenylene oxide)

U2 - 10.1016/j.ijhydene.2019.06.130

DO - 10.1016/j.ijhydene.2019.06.130

M3 - Journal article

VL - 44

SP - 22137

EP - 22145

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 0360-3199

IS - 39

ER -