Polymeric materials
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United States of America Patent
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May 29, 2012
Grant Date -
Nov 22, 2007
app pub date -
Apr 1, 2004
filing date -
Apr 2, 2003
priority date (Note) -
Expired
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Abstract
A polymer electrolyte membrane or gas diffusion electrode includes an ion-conducting polymeric material which includes moieties of formula (A) which are substituted on average with more than 1 and 3 or fewer groups (e.g. sulphonate groups) which provide ion-exchange sites and hydrogen atoms of said moieties are optionally substituted, wherein each X in said moieties of formula A independently represent an oxygen or sulphur atom. The ion conducting polymeric material is suitably prepared by controllably sulphonating a polymeric material using about 100% sulphuric acid at 34° C. to 36° C.
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