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In-situ synthesis of cross-linked imidazolium functionalized Poly(styrene-b-isobutylene-b-styrene) for anion exchange membranes

journal contribution
posted on 12.04.2021, 09:49 by Rui Yang, Pei Dai, Shu Zhang, Ri-Wei Xu, Song Hong, Wen-Feng LinWen-Feng Lin, Yi-Xian Wu
The cross-linked imidazolium functionalized anion-exchange membranes is in-situ prepared via reaction of chloromethylated poly(styrene-b-isobutylene-b-styrene) with 1,1’-(1,6-hexanediyl)bisimidazole and N-methylimidazole. The composite membranes of cross-linked imidazolium poly(styrene-b-isobutylene-b-styrene) with a small amount of modified graphene oxide grafted with octadecyl and propyl phenyl imidazolium could be further prepared. These membranes exhibit significantly high chemical stability and ionic conductivity (σ), marked by low methanol permeability, together with improved dynamic mechanical properties. The ionic conductivity of cross-linked imidazolium poly(styrene-b-isobutylene-b-styrene) reaches 2.09 × 10−2 S cm−1 at 80 °C by introduction of 0.5 wt% loading of modified graphene oxide. This membrane also behaves an excellent chemical stability and σ can remain ca. 82% of the original value after immerged in strong alkaline medium (2 M NaOH) at 60 °C for 500 h, which is almost the same as that (ca. 82%) of commercial Nafion 115 in acid medium (2 M H2SO4) at 60 °C for 500 h. The cross-linked imidazolium poly(styrene-b-isobutylene-b-styrene) is characterized as a promising anion exchange membrane materials in fuel cell for its high ionic conductivity, chemical stability and low methanol permeability.

Funding

National Natural Science Foundation of China (51521062)

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

Polymer

Volume

224

Publisher

Elsevier BV

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Polymer and the definitive published version is available at https://doi.org/10.1016/j.polymer.2021.123682

Acceptance date

20/03/2021

Publication date

2021-03-30

Copyright date

2021

ISSN

0032-3861

Language

en

Depositor

Prof Wen Feng Lin. Deposit date: 12 April 2021

Article number

123682