Comparaison des Propriétés de Solutions de Poly‐2‐Vinylpyridines Atactiques et Isotactiques

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We have prepared an atactic polymer of 2‐vinylpyridine by bulk polymerization at 30°C. with azobisisobutyronitrile as the initiator. The fractionation furnishes seven fractions. In addition, we have obtained a series of isotactic poly‐2‐vinylpyridines by homogeneous phase polymerization with phenylmagnesium bromide as initiator. We have studied these polymers by viscosity and light scattering techniques. In solution in absolute ethanol and in dimethylformamide, the behavior of atactic polymers is quite usual and we have established the two relations: On the other hand, in the same solvents, the isotactic polymers present an important polyelectrolyte effect. This effect disappears by adding soluble electrolytes in the solvents, and in these conditions it is possible to give the two relations: For the atactic polymers, we have the relation: We think that a small extent of quaternization of isotactic polymers is responsible for the effects observed.