The relative reactivities of vinyl monomers in low-temperature copolymerizations and terpolymerizations with S$ in the presence of tert-butyl hydroperoxide as initiator were compared. The highest copolymerization rates were found in systems containing an electron-donor monomer of low resonance stabilization, and the resulting products have an alternating structure. In reactions with monomers of high resonance stabilization and electron-acceptor properties, mainly homopropagation of the comonomer proceeds. In the terpolymerization of S q with two electron-donor monomers, the relative reactivity of monomers depends mainly on their resonance stabilization. In the terpolymerization in systems S$ /electron-donor monomer/electron-acceptor monomer the relative reactivity of acceptor monomers decreases with increasing inductive effect in the molecule.
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