期刊
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
卷 55, 期 7, 页码 612-622出版社
WILEY
DOI: 10.1002/polb.24310
关键词
anion exchange membrane; block copolymers; conducting polymers; ionomers; ion conductivity; inverse morphology; morphology; mechanical properties; mechanically robust; pentablock copolymer
资金
- U.S. Army Research Office [W911NF-10-1-0520, W911NF-11-1-0306]
- Fuel Cell Technologies Office, of the U.S. Department of Energy, Energy Efficiency and Renewable Energy [DE-AC02-05CH11231]
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 degrees C and 95% RH) with low water absorption (<25 wt %) and maintained adequate mechanical properties in both dry and hydrated conditions. Xray scattering and transmission electron microscopy (TEM) revealed formation of cylindrical non-ionic domains in a connected ionic phase. (C) 2017 Wiley Periodicals, Inc.
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