Abstract
Two methods to introduce negative charges on a C60 and the further use of these carbanions as initiators for anionic polymerization of styrene and methyl methacrylate were investigated. From the potassium salts of C60, obtained by reduction with potassium naphthalenide, only the hexaanion is able to polymerize MMA, and that by electron transfer so that no fullerene is attached to the PMMA. In a second method, polystyryllithium was added to C60 to form “living” star molecules with a C60 core bearing a well-controlled number of branches (i.e., carbanions). Six carbanions have to be located on the C60 to initiate anionic polymerization of styrene by addition onto the monomer, while five are enough to initiate the more reactive MMA. Stars with seven PS branches and heterostars with six PS and two PMMA have been produced.
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