POLYMERS OF 1-AZABICYCLOOCTANE[4,2,0] .3. MODIFICATION OF POLYSTYRENE-BLOCK-POLY-1-AZABICYCLOOCTANE[4,2,0]

Polystyrene-block-poly-1-azabicyclooctane[4,2,0] has been modified by protonation or alkylation of the polyamine moiety. Short chain alkyl i odides lead to quantitatively quarternized products while longer alkyl chains or alkyl-bromides give incomplete conversion. The viscosimetri c behavior of the charged blockcopolymers is dominated by the polyelec trolyte block although the polyelectrolyte effect is drastically reduc ed by the presence of the polystyrene block. The blockcopolymers are i nsoluble in water, but concentrated solutions of the polymers in DMF c an be diluted with any amount of water without any precipitation. Alth ough the blockcopolymers have an amphiphilic structure they do not exh ibit any surface activity. In a water/DMF (9/1) solution the polymers have a core-shell micelle-like structure of collapsed polystyrene bloc k which is solubilized by the surrounding polyelectrolyte block.