Abstract
A star-shaped copolymer consisting of a hyperbrached poly(3-methyl-3-oxetanemethanol) core and polytetrahydrofuran arms was obtained by a one-step cationic copolymierization of 3-methyl-3-oxetanemethanol with tetrahydrofuran initiated by BF 3 .OEt 2 . Tetrahydrofuran served as a solvent at the earliet stage of the polymerization. After 3-methyl-3-oxetanemethanol exhausted essentially, the resulting hyperoranched species acted as a macro-initiator, and initiated the cationic polymerization of tetrahydrofuran. This can be attributed to the large difference in reactivities of the monomers.
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