Processes for producing nano-space controlled polymer ion-exchange membranes
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United States of America Patent
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Jul 31, 2012
Grant Date -
Feb 7, 2008
app pub date -
Aug 21, 2007
filing date -
Aug 28, 2003
priority date (Note) -
Expired
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Abstract
A polymer film substrate is irradiated with ions to make a large number of nano-sized through-holes and the substrate may be further irradiated with ionizing radiation so that a functional monomer may be grafted or co-grafted onto a surface of the film and within the holes; in addition, sulfonic acid group(s) may be introduced into the graft chains to produce a polymer ion-exchange membrane that may have high oxidation resistance, dimensional stability, electrical conductivity and/or methanol resistance, as well as may have an ion-exchange capacity controlled over a wide range.
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