Abstract
Di- and triblock copolymers of isoprene and styrene having a highly polar sulfozwitterion group on one or both ends of the chain were prepared by anionic polymerization using high-vacuum techniques with [3-(dimethylamino)propyl]lithium as initiator. The dimethylamino end group of the chain was transformed to a zwitterion by reaction with cyclopropanesultone. The monofunctional zwitterion-capped copolymers were found to associate in CCl 4 (a good solvent for polystyrene and polyisoprene) whereas the difunctional versions formed gels even below the coil overlap concentration c * . The aggregation number was found to decrease with increasing base molecular weight due to the excluded vulume repulsions of the copolymeric tails
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