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Amphiphilic star-block copolymers composed of polystyrene and poly(acrylic acid)were synthesized by iodide- mediated radical polymerization.Firstly,free radical polymerization of styrene was carried out with AIBN as initiator and 1,1,1-trimethyolpropane tri(2-iodoisobutyrate)as chain transfer agent,giving iodine atom ended star-shaped polystyrene with three arm chains,R(polystyrene)_3.Secondly,tert-butyl acrylate was polymerization using polystyrene obtained as macro-chain transfer agent,and star-block copolymer,R(polystyrene-b-poly(tert-butyl acrylate))_3 with controlled molecular weight was obtained.Finally,amphiphilic star-block copolymer,R(polystyrene-b-poly(acrylic acid))_3 was obtained by hydrolysis of R(polystyrene-b-poly(tert-butyl acrylate))_3 under acidic condition.
Amphiphilic star-block copolymers composed of polystyrene and poly (acrylic acid) were synthesized by iodide-mediated radical polymerization. Firstly, free radical polymerization of styrene was carried out with AIBN as initiator and 1,1,1-trimethyolpropane tri (2-iodoisobutyrate ) as chain transfer agent, giving iodine atom ended star-shaped polystyrene with three arm chains, R (polystyrene) _3.Secondly, tert-butyl acrylate was polymerization using polystyrene obtained as macro-chain transfer agent, and star- (polystyrene-b-poly (tert-butyl acrylate) _3 with controlled molecular weight was obtained. Finaally, amphiphilic star-block copolymer, R -b-poly (tert-butyl acrylate) _3 under acidic condition.