Journal
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 206, Issue 4, Pages 504-512Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.200400353
Keywords
living polymerization; molecular weight distribution/molar mass distribution; radical polymerization; ring-opening polymerization; star polymers
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Well-defined AB(2) 3- and AB(4) 5-miktoarm star copolymers were prepared by combination of ring-opening polymerization (ROP) and nitroxide-mediated radical polymerization (NMRP) using dendritic tri- and penta-functional initiators. Initially, two kinds of dendritic initiators having one benzylic OH and two or four TEMPO-based alkoxyamine moieties were prepared. Using them, ROP of epsilon-caprolactone was carried out at room temperature to give poly(g-caprolactone)s carrying two or four alkoxyamine moieties. NMRP of styrene from the poly(E-caprolactone)s was carried out at 120degreesC to give AB, 3- and AB4 5-miktoarm star copolymers, which were analyzed by H-1 NMR and SEC. Tie (M) over bar S-n increased linearly with conversion and the (M) over bar (w)/(M) over bar (n)s were in the range 1.10-1.37, showing that well-defined AB(2)3- and AB(4)5-miktoarm star copolymers were formed.
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