Experimental Section Preparation of poly(vinylimidazole)-functionalized polysiloxane/Nafion hybrids Telomerization of poly(1-vinylimidazole), was carried out by dissolving 4.7 g (50 mmol) of 1-vinylimidazole (Alfa Aesar) and 0.98 g (5 mmol) of 3-mercaptopropyltrimethoxysilane (MPTMS, Dow Corning Corporation) in distilled methanol, followed by the addition of 0.1 g of azobisisobutyronitrile (AIBN, SHOWA). The solution was stirred at the reflux temperature for 12 h in an N 2 gas atmosphere. After

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... reaction completion, the solution was concentrated in vacuo. White precipitates formed upon the addition of diethyl ether to the residue solution at -20 °C. The precipitates were filtrated and washed thoroughly with diethyl ether and dried in vacuo. A yellowish viscous liquid product was obtained with a yield of 67%. Different degree of polymerization was accomplished by using 23.5 g (250 mmol) of 1-vinylimidazole, 0.98 g (5 mmol) of MPTMS, and 0.49 g of AIBN. The average degree of polymerization (n) was determined by 1 H NMR spectroscopy, and found to be 6 and 33. The degrees of polymerization Electronic Supplementary Material (ESI) for Polymer Chemistry This journal is