Etude de la reactivite de la vinyl-2 pyridine en polymerisation anionique–II. Copolymerisation avec le diphenyl-1,1 ethylene

A kinetic study was made for addition of 1,1-diphenylethylene to active species-involved in anionic polymerizations of 2-vinyl pyridine and styrene in tetrahydrofuran solution with Cs⁺ as counter-ion: it showed that poly(styrene)^? free ion is much more reactive than poly(2-vinylpyridine)^? free ion. The intrinsic reactivity of the corresponding ion pairs varies in the same way as for the free ions but not proportionally. The measured values corroborate previous values established for the homopolymerizations of these monomers. For Na⁺ as counter-ion, the experimental results are explained by cation solvation by pyridine moieties.