RAFT-based synthesis and characterization of ABC versus ACB triblock copolymers containing tert-butyl acrylate, isoprene, and styrene blocks(a)
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abstract
The syntheses of the ABC and ACB triblock copolymer topological isomers poly(tert-butyl acrylate)-block-polyisoprene-block-polystyrene (ABC) and poly(tert-butyl acrylate)-block-polystyrene-block-polyisoprene (ACB) using the RAFT-controlled radical polymerization method are described. The triblock copolymers were isolated with molecular weights on the order of 20000 Da and molecular weight distributions of 1.3-1.5. The polymers described herein demonstrated thermal decompositions at 200C, characteristic of tert-butyl esters, and their structure and composition were confirmed by a combination of infrared, 1H, and 13C NMR spectroscopies. 2007 WILEY-VCH Verlag GmbH & Co. KGaA.