Abstract
A poly(styrene-b-isobutylene-b-styrene) triblock copolymer has been prepared by a two-step process. Polyisobutylene with Mn= 6600 and Mw/Mn= 1.12 functionalized with phenol at both ends was reacted with 2-bromopropionyl chloride to form a macroinitioator for atom transfer radical polymerization (ATRP). The synthesized difunctional PIB macroinitiator was subsequently heated with styrene xylene solution in the second step to 110°C under conditions for ATRP using the copper coordination complex CuBr/bipyridine. Both the macroinitiator and the triblock copolymer were characterized by 1H NMR and SEC. The triblock copolymer with around 25% polystyrene was found to have a narrow molecular weight distribution of 1.20.
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