
An ionomer is a polyelectrolyte that comprises copolymers containing both electrically neutral repeating units and a fraction of ionized units
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http://en.wikipedia.org/wiki/Glossary_of_fuel_cell_terms

An ionomer (ər) (iono- + -mer) is a polymer that comprises repeat units of both electrically neutral repeating units and a fraction of ionized units (usually no more than 15 mole percent) covalently bonded to the polymer backbone as pendant moieties. This means that most ionomers are copolymers of the neutral segments and the ionized units, which...
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http://en.wikipedia.org/wiki/Ionomer

any of a class of plastics that because of its ionic bonding action is capable of conducting electric current.
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https://www.infoplease.com/dictionary/ionomer
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