Synthesis and characterization of a novel bisnitroxide initiator for effecting "outside-in" polymerization
A new bis-α-hydrogen nitroxide based initiator for use in nitroxide-mediated free radical polymerization (NMRP) has been synthesized and is demonstrated to effect controlled polymerizations. The bisnitroxide forms "living" systems; the resulting polymers are formed with low polydispersities. The addition of a second block is facile, forming symmetrical ABA triblock copolymers. Monomer addition occurs at the center of the living polymer. This "outside-in" strategy overcomes previous restrictions in sequence specificity encountered in preparing ABA triblock copolymers using NMRP by the more traditional, complementary "inside - out" bidirectional nitroxide initiators.
Hill, Nicole L.,Braslau, Rebecca
p. 9066 - 9074
(2008/02/02)
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