Abstract
Bidirectional alkoxyamine 2 was synthesized and used as the initiator in the polymerization of styrene (S), n-butyl acrylate ( nBA), t-butyl acrylate ( tBA), isoprene (I), and dimethylacrylamide (DMA). A variety of symmetrical ABA triblock copolymers were prepared, ranging in size from 5 to 59 kDa. Kinetics studies and gel permeation chromatography (GPC) confirmed the “living” nature of these polymerizations. Trifluoroacetic acid was used to convert the P tBA blocks of these polymers into poly(acrylic acid) (PAA) blocks, forming ABA amphiphilic triblock copolymers. AFM images of PAA- b-P nBA- b-PAA and PAA- b-PS- b-PAA triblock copolymers ionized by the addition of 2,2′-(ethylenedioxy)bis(ethylamine) show evidence of self-assembly.
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