Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 310, Issue 1-2, Pages 577-585Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2007.11.039
Keywords
poly(2,6-dimethyl-1,4-phenylene oxide) (PPO); blend membrane; hydroxyl ion conductivity; methanol permeability; alkaline fuel cell
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A series of hydroxyl-conducting anion-exchange membranes were prepared by blending chloroacetylated poly(2,6-dimethyl-1,4-phenylene oxide) (CPPO) with bromomethylated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO), and their fuel cell-related performances were evaluated. The resulting membranes exhibited high hydroxyl conductivities (0.022-0,032 S cm(-1) at 25 degrees C) and low methanol permeability (1.35 x 10(-7) to 1.46 x 10(-7) cm(2) s(-1)). All the blend membranes proved to be miscible or partially miscible under the investigations of scanning electron microscopy (SEM) and differential scanning calorimeters (DSC). By condition optimization, the blend membranes with 30-40 wt% CPPO are recommended for application in direct methanol alkaline fuel cells because they showed low methanol permeability, excellent mechanical properties and comparatively high hydroxyl conductivity. (C) 2007 Elsevier B.V. All rights reserved.
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