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Title: Durability and performance of polystyrene- b -poly(vinylbenzyl trimethylammonium) diblock copolymer and equivalent blend anion exchange membranes

Abstract

Anion exchange membranes (AEM) are solid polymer electrolytes that facilitate ion transport in fuel cells. In this study, a polystyrene-b-poly(vinylbenzyl trimethylammonium) diblock copolymer was evaluated as potential AEM and compared with the equivalent homopolymer blend. The diblock had a 92% conversion of reactive sites with an IEC of 1.72 ± 0.05 mmol g-1, while the blend had a 43% conversion for an IEC of 0.80 ± 0.03 mmol g-1. At 50°C and 95% relative humidity, the chloride conductivity of the diblock was higher, 24–33 mS cm-1, compared with the blend, 1–6 mS cm-1. The diblock displayed phase separation on the length scale of 100 nm, while the blend displayed microphase separation (~10 μm). Mechanical characterization of films from 40 to 90 microns thick found that elasticity and elongation decreased with the addition of cations to the films. At humidified conditions, water acted as a plasticizer to increase film elasticity and elongation. While the polystyrene-based diblock displayed sufficient ionic conductivity, the films' mechanical properties require improvement, i.e., greater elasticity and strength, before use in fuel cells. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41596.

Authors:
 [1];  [1];  [1];  [2];  [3];  [2];  [1];  [1]
  1. Department of Chemical and Biological Engineering, Colorado School of Mines, Golden Colorado 80401
  2. Department of Chemistry and Geochemistry, Colorado School of Mines, Golden Colorado 80401
  3. X-Ray Science Division, Argonne National Laboratory, Argonne Illinois 60439
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); U.S. Army Research Laboratory - U.S. Army Research Office (ARO)
OSTI Identifier:
1239585
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Journal of Applied Polymer Science
Additional Journal Information:
Journal Volume: 132; Journal Issue: 10; Journal ID: ISSN 0021-8995
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
batteries and fuel cells; conducting polymers; copolymers; mechanical properties; membranes

Citation Formats

Vandiver, Melissa A., Caire, Benjamin R., Poskin, Zach, Li, Yifan, Seifert, Sönke, Knauss, Daniel M., Herring, Andrew M., and Liberatore, Matthew W. Durability and performance of polystyrene- b -poly(vinylbenzyl trimethylammonium) diblock copolymer and equivalent blend anion exchange membranes. United States: N. p., 2014. Web. doi:10.1002/APP.41596.
Vandiver, Melissa A., Caire, Benjamin R., Poskin, Zach, Li, Yifan, Seifert, Sönke, Knauss, Daniel M., Herring, Andrew M., & Liberatore, Matthew W. Durability and performance of polystyrene- b -poly(vinylbenzyl trimethylammonium) diblock copolymer and equivalent blend anion exchange membranes. United States. https://doi.org/10.1002/APP.41596
Vandiver, Melissa A., Caire, Benjamin R., Poskin, Zach, Li, Yifan, Seifert, Sönke, Knauss, Daniel M., Herring, Andrew M., and Liberatore, Matthew W. 2014. "Durability and performance of polystyrene- b -poly(vinylbenzyl trimethylammonium) diblock copolymer and equivalent blend anion exchange membranes". United States. https://doi.org/10.1002/APP.41596.
@article{osti_1239585,
title = {Durability and performance of polystyrene- b -poly(vinylbenzyl trimethylammonium) diblock copolymer and equivalent blend anion exchange membranes},
author = {Vandiver, Melissa A. and Caire, Benjamin R. and Poskin, Zach and Li, Yifan and Seifert, Sönke and Knauss, Daniel M. and Herring, Andrew M. and Liberatore, Matthew W.},
abstractNote = {Anion exchange membranes (AEM) are solid polymer electrolytes that facilitate ion transport in fuel cells. In this study, a polystyrene-b-poly(vinylbenzyl trimethylammonium) diblock copolymer was evaluated as potential AEM and compared with the equivalent homopolymer blend. The diblock had a 92% conversion of reactive sites with an IEC of 1.72 ± 0.05 mmol g-1, while the blend had a 43% conversion for an IEC of 0.80 ± 0.03 mmol g-1. At 50°C and 95% relative humidity, the chloride conductivity of the diblock was higher, 24–33 mS cm-1, compared with the blend, 1–6 mS cm-1. The diblock displayed phase separation on the length scale of 100 nm, while the blend displayed microphase separation (~10 μm). Mechanical characterization of films from 40 to 90 microns thick found that elasticity and elongation decreased with the addition of cations to the films. At humidified conditions, water acted as a plasticizer to increase film elasticity and elongation. While the polystyrene-based diblock displayed sufficient ionic conductivity, the films' mechanical properties require improvement, i.e., greater elasticity and strength, before use in fuel cells. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41596.},
doi = {10.1002/APP.41596},
url = {https://www.osti.gov/biblio/1239585}, journal = {Journal of Applied Polymer Science},
issn = {0021-8995},
number = 10,
volume = 132,
place = {United States},
year = {2014},
month = {11}
}