Copolymerization of Ethylene, Tetrafluoroethylene, and an Olefin-Containing Fluorosulfonyl Fluoride: Synthesis of High-Proton-Conductive Membranes for Fuel-Cell Applications By courtesy of: Zhen-Yu Yang* and Raj G. Rajendran Angew. Chem. Int. Ed. 2005, 44, 564 –567