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Title: Ion transport properties of mechanically stable symmetric ABCBA pentablock copolymers with quaternary ammonium functionalized midblock

Abstract

Anion exchange membranes (AEMs) are a promising class of materials for applications that require selective ion transport, such as fuel cells, water purification, and electrolysis devices. Studies of structure–morphology–property relationships of ion-exchange membranes revealed that block copolymers exhibit improved ion conductivity and mechanical properties due to their microphase-separated morphologies with well-defined ionic domains. While most studies focused on symmetric diblock or triblock copolymers, here, the first example of a midblock quaternized pentablock AEM is presented. A symmetric ABCBA pentablock copolymer was functionalized to obtain a midblock brominated polymer. Solution cast films were then quaternized to obtain AEMs with resulting ion exchange capacities (IEC) ranging from 0.4 to 0.9 mmol/g. Despite the relatively low IEC, the polymers were highly conductive (up to 60 mS/cm Br- at 90 °C and 95%RH) with low water absorption (<25 wt %) and maintained adequate mechanical properties in both dry and hydrated conditions. X-ray scattering and transmission electron microscopy (TEM) revealed formation of cylindrical non-ionic domains in a connected ionic phase.

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Fuel Cell Technologies Office
OSTI Identifier:
1713213
DOE Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Journal of Polymer Science, Part B: Polymer Physics
Additional Journal Information:
Journal Volume: 55; Journal Issue: 7
Country of Publication:
United States
Language:
English

Citation Formats

Ertem, SP, Caire, BR, Tsai, TH, Zeng, D, Vandiver, MA, Kusoglu, A, Seifert, S, Hayward, RC, Weber, AZ, Herring, AM, Coughlin, EB, and Liberatore, MW. Ion transport properties of mechanically stable symmetric ABCBA pentablock copolymers with quaternary ammonium functionalized midblock. United States: N. p., 2017. Web. doi:10.1002/polb.24310.
Ertem, SP, Caire, BR, Tsai, TH, Zeng, D, Vandiver, MA, Kusoglu, A, Seifert, S, Hayward, RC, Weber, AZ, Herring, AM, Coughlin, EB, & Liberatore, MW. Ion transport properties of mechanically stable symmetric ABCBA pentablock copolymers with quaternary ammonium functionalized midblock. United States. https://doi.org/10.1002/polb.24310
Ertem, SP, Caire, BR, Tsai, TH, Zeng, D, Vandiver, MA, Kusoglu, A, Seifert, S, Hayward, RC, Weber, AZ, Herring, AM, Coughlin, EB, and Liberatore, MW. 2017. "Ion transport properties of mechanically stable symmetric ABCBA pentablock copolymers with quaternary ammonium functionalized midblock". United States. https://doi.org/10.1002/polb.24310.
@article{osti_1713213,
title = {Ion transport properties of mechanically stable symmetric ABCBA pentablock copolymers with quaternary ammonium functionalized midblock},
author = {Ertem, SP and Caire, BR and Tsai, TH and Zeng, D and Vandiver, MA and Kusoglu, A and Seifert, S and Hayward, RC and Weber, AZ and Herring, AM and Coughlin, EB and Liberatore, MW},
abstractNote = {Anion exchange membranes (AEMs) are a promising class of materials for applications that require selective ion transport, such as fuel cells, water purification, and electrolysis devices. Studies of structure–morphology–property relationships of ion-exchange membranes revealed that block copolymers exhibit improved ion conductivity and mechanical properties due to their microphase-separated morphologies with well-defined ionic domains. While most studies focused on symmetric diblock or triblock copolymers, here, the first example of a midblock quaternized pentablock AEM is presented. A symmetric ABCBA pentablock copolymer was functionalized to obtain a midblock brominated polymer. Solution cast films were then quaternized to obtain AEMs with resulting ion exchange capacities (IEC) ranging from 0.4 to 0.9 mmol/g. Despite the relatively low IEC, the polymers were highly conductive (up to 60 mS/cm Br- at 90 °C and 95%RH) with low water absorption (<25 wt %) and maintained adequate mechanical properties in both dry and hydrated conditions. X-ray scattering and transmission electron microscopy (TEM) revealed formation of cylindrical non-ionic domains in a connected ionic phase.},
doi = {10.1002/polb.24310},
url = {https://www.osti.gov/biblio/1713213}, journal = {Journal of Polymer Science, Part B: Polymer Physics},
number = 7,
volume = 55,
place = {United States},
year = {2017},
month = {4}
}

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  • Hickner, Michael A.; Herring, Andrew M.; Coughlin, E. Bryan
  • Journal of Polymer Science Part B: Polymer Physics, Vol. 51, Issue 24, p. 1727-1735
  • https://doi.org/10.1002/polb.23395

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