The polymerization of tetrahydrofuran was initiated with 4,4'-azobis(4-~yanovaleryl chloride) in conjunction with silver hexafluoroantimonate and the living polytetrahydrofuran (PTHF) was terminated with pyridinium N-oxide derivatives. The resulting PTHFmacroinitiator possesses both a thermally and photochemically labile group.
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