The Influence of Various Cationic Group on Polynorbornene Based Anion Exchange Membranes with Hydrophobic Large Steric Hindrance Arylene Substituent

Wei Wang; Da-Fu Cao; Xiao-Wei Sun; Li Pan; Zhe Ma; Yue-Sheng Li

doi:10.1007/s10118-022-2786-1

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The Influence of Various Cationic Group on Polynorbornene Based Anion Exchange Membranes with Hydrophobic Large Steric Hindrance Arylene Substituent

RESEARCH ARTICLE | Updated：2023-01-06

- The Influence of Various Cationic Group on Polynorbornene Based Anion Exchange Membranes with Hydrophobic Large Steric Hindrance Arylene Substituent
  Enhanced Publication
- Chinese Journal of Polymer Science Vol. 41, Issue 2, Pages: 278-287(2023)
- Affiliations：
  
  1.Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China
- Author bio：
  
  lilypan@tju.edu.cn (L.P.)
  ysli@tju.edu.cn (Y.S.L.)
- Funds：
- DOI：10.1007/s10118-022-2786-1
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Wei Wang, Da-Fu Cao, Xiao-Wei Sun, et al. The Influence of Various Cationic Group on Polynorbornene Based Anion Exchange Membranes with Hydrophobic Large Steric Hindrance Arylene Substituent. [J]. Chinese Journal of Polymer Science 41(2):278-287(2023)
DOI：

Wei Wang, Da-Fu Cao, Xiao-Wei Sun, et al. The Influence of Various Cationic Group on Polynorbornene Based Anion Exchange Membranes with Hydrophobic Large Steric Hindrance Arylene Substituent. [J]. Chinese Journal of Polymer Science 41(2):278-287(2023) DOI： 10.1007/s10118-022-2786-1.

摘要

A series of brominated polynorbornene derivatives containing large steric hydrophobic groups in the main chain were synthesized by ROMP and post-functionalization by Menshutkin. The large steric hydrophobic groups can balance the high hydroxide conductivity and low swelling ratio in AEMs. The gradient structure of the main chain gives remarkable phase separation. When IEC closes to 2.0 meq/g, PBO-,x,%-,y, (,x,=66, 68, 70; ,y,=QA, Im, Pyr, Pip) AEMs exhibit high hydroxide conductivity.

Abstract

A series of brominated polynorbornene derivatives, including bulky steric hydrophobic groups and highly physical and chemical stable backbones, were synthesized ,via, ring-opening metathesis polymerization and post-functionalized with trimethylammonium (QA),N,-methylimidazole (Im),N,-methylpyrrolidinium (Pyr) or ,N,-methylpiperidinium (Pip) to construct the entire anion exchange membranes (AEMs). Benefited from prominent phase-separated morphology, PBO-,x,%-,y, (,x,=66, 68, 70; ,y,=QA, Im, Pyr, Pip) AEMs with ion exchange capacity (IEC) approaching 2.0 meq·g,−1, exhibited super high hydroxide conductivities. Thereinto, PBO-70%-Pip possessed the highest hydroxide conductivity of 137.3 mS·cm,−1, at 80 °C. Moreover, all membranes exhibit low swelling ratio (SR) (the SR of PBO-66%-QA was just 8.6% at 80 °C). That is, bulky steric hydrophobic groups play a crucial role in balancing the high hydroxide conductivity and low SR in AEMs. Furthermore, three AEMs (PBO-66%-QA, PBO-68%-Pyr, PBO-70%-Pip) showed good alkaline stability after immersion into 1.0 mol/L NaOH aqueous solution at 80 °C for 480 h without any degradation.

关键词

Keywords

Anion exchange membraneSteric hindrancePhase separationIon conductivitySwelling ratio

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