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Star-branched polystyrenes by nitroxide living free-radical polymerization

✍ Scribed by Thodoris Tsoukatos; Stergios Pispas; Nikos Hadjichristidis

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
133 KB
Volume
39
Category
Article
ISSN
0887-624X

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✦ Synopsis

Star-branched polystyrenes, with polydispersity indices of 1.15-1.56 and 4 -644 equal arms, were synthesized by the reaction of 2,2,6,6-tetramethylpiperidin-1yloxy (TEMPO)-capped polystyrene (PS-T) with divinylbenzene (DVB). The characterization of PS-T and the final star polymers was carried out by size exclusion chromatography, low-angle laser light scattering, and viscometry. The degree of branching of the star polymers depended on the DVB/PS-T ratio and the PS-T molecular weight. An asymmetric (or miktoarm) star homopolymer of the PS n PSЈ n type was made by the reaction of the PS n symmetric star, which had n TEMPO molecules on its nucleus and consisted of a multifunctional initiator, with extra styrene.

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