K. Muhlbach et Rc. Schulz, POLYMERS OF 1-AZABICYCLOOCTANE[4,2,0] .3. MODIFICATION OF POLYSTYRENE-BLOCK-POLY-1-AZABICYCLOOCTANE[4,2,0], Acta polymerica, 46(2), 1995, pp. 130-133
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.