A polymer comprising polycyclic repeating units having recurring ion conducting groups and optional crosslinkable groups is disclosed. The present invention provides the capability of tailoring polymers to impart unique properties to membranes fabricated from the polymers. Membranes comprising the polymers and methods for preparing the membranes and their use in ion conducting membranes, particularly in fuel cells, are also provided.

 
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< Polymer membrane, process for its production and membrane-electrode assembly for solid polymer electrolyte fuel cells

> Polyhydroxyalkanoate containing amide group, sulfonic group, and sulfonate ester group, method for producing the same, and charge control agent, toner, image forming method, and image forming apparatus
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