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

Ertem, SP; Caire, BR; Tsai, TH; Zeng, D; Vandiver, MA; Kusoglu, A; Seifert, S; Hayward, RC; Weber, AZ; Herring, AM; Coughlin, EB; Liberatore, MW

doi:10.1002/polb.24310

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

Journal Article · Sat Apr 01 00:00:00 EDT 2017 · Journal of Polymer Science, Part B: Polymer Physics

DOI:https://doi.org/10.1002/polb.24310· OSTI ID:1713213

Ertem, SP; Caire, BR; Tsai, TH; Zeng, D; Vandiver, MA; Kusoglu, A; Seifert, S; Hayward, RC; Weber, AZ; Herring, AM; Coughlin, EB; Liberatore, MW

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.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Fuel Cell Technologies Office

DOE Contract Number:: AC02-05CH11231

OSTI ID:: 1713213

Journal Information:: Journal of Polymer Science, Part B: Polymer Physics, Vol. 55, Issue 7

Country of Publication:: United States

Language:: English

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