Morphology control of sulfonated poly(ether ketone ketone) poly(ether imide) blends and their use in proton-exchange membranes

被引:54
作者
Swier, S
Shaw, MT
Weiss, RA
机构
[1] Univ Connecticut, Polymer Sci Program, Storrs, CT 06269 USA
[2] Univ Connecticut, Dept Chem Engn, Storrs, CT 06269 USA
关键词
poly(ether ketone ketone); poly(ether imide); polymer blend; proton-exchange membrane;
D O I
10.1016/j.memsci.2005.06.037
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Polymer blends based on sulfonated poly(ether ketone ketone) (SPEKK) as the proton-conducting component and poly(ether imide) (PEI) as the second component were considered for proton-exchange membranes (PEMs). The PEI was added to improve the mechanical stability and lower the water swelling in the fuel cell environment. Membranes were cast from solution using N-methyl-2-pyrrolidone (NMP) and dimethylacetamide (DMAc). The ternary, polymer/polymer/solvent, phase diagram was determined to provide guidance on how to control the morphology during solvent casting of blend membranes. For blends of SPEKK (ion-exchange capacity = 2 mequiv/g) with PEI as the minority component, the morphology consisted of dispersed particles of similar to 0.5-6 mu m. Larger particles were achieved by increasing the PEI content and/or lowering the casting temperature. High-temperature annealing after solution casting did not affect the morphology of blend membranes, due to the low mobility and compatibility of the two polymers. The possible use of SPEKK/PEI blends in PEMs is discussed in terms of existing theories of ion transport in polymers. (c) 2005 Published by Elsevier B.V.
引用
收藏
页码:22 / 31
页数:10
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