The present invention relates to an improved method for making sulfonated block copolymers and to methods for making membranes from such block copolymers. In particular, the present invention relates to an improved method for making sulfonated block copolymers having at least two polymer end blocks that...http://www.google.com/patents/US20090280255?utm_source=gb-gplus-sharePatent US20090280255 - METHOD FOR MAKING SULFONATED BLOCK COPOLYMERS, METHOD FOR MAKING MEMBRANES FROM SUCH BLOCK COPOLYMERS AND MEMBRANE STRUCTURES
