Abstract
A method is described whereby ‘living’ anionic polystyrene may be oxidized via a stable intermediate stage to a polymeric cation. The process involves termination with excess bromine, and the subsequent reaction of the polymeric product with an appropriate silver salt in the presence of a second monomer. Block copolymers involving tetrahydrofuran have been prepared in this way, but the efficiency of the process is marred by a competing proton elimination reaction at the initiation stage. Nevertheless, block copolymers have been synthesized by this means with polydispersities as low as 1.04.
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