Abstract
We have previously described a new route to A 2B star block copolymers by a double addition–elimination reaction of a polystyryl carbanion with a particular 1,1-diphenylethylene derivative. By using the same reagent, we are now able to prepare A 2 or A 3 homopolymers by changing the solvent, i.e. tetrahydrofuran or toluene/tetrahydrofuran, respectively. We propose a mechanism involving nucleophilic substitution reactions to explain this peculiar result and use this opportunity to prepare A 2B or A 3B star block copolymers based on styrene and ethylene oxide or tert-butyl methacrylate.
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