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- W2000548739 abstract "We have developed a new iterative methodology for the synthesis of both regular and asymmetric star-branched polymers. The methodology involves only two sets of reactions for the entire iterative synthetic sequence: a living linking reaction of either 1,1-bis[3‘-(1‘ ‘-phenylethenyl)phenyl]ethylene or 1,1-diphenylethylene (DPE) functionalized polymers with living anionic polymers and an in-situ reaction for introducing DPE moieties into the polymers. By repeating the two reactions in the iteration, a series of regular star-branched polystyrenes of A3, A6, A9, A12, and A15 types and asymmetric star-branched polymers of A3B3 and A3B3C3 types were successfully synthesized. There does not seem to be a steric limitation even in the fifth iteration. The A and B segments in these star-branched polymers were polystyrene and poly(4-methoxystyrene), respectively, and the C segment was poly(4-tert-butyldimethylsilyloxystyrene), poly(4-trimethylsilylstyrene), or polyisoprene. Their arm segments were precisely controlled in chain length, with well-defined architectures, and high degrees of compositional homogeneity, as confirmed by 1H NMR, SEC, VPO, SLS, and viscosity measurements." @default.
- W2000548739 created "2016-06-24" @default.
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- W2000548739 date "2002-08-07" @default.
- W2000548739 modified "2023-09-23" @default.
- W2000548739 title "Synthesis of Branched Polymers by Means of Living Anionic Polymerization. 13. Synthesis of Well-Defined Star-Branched Polymers via an Iterative Approach Using Living Anionic Polymers" @default.
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- W2000548739 doi "https://doi.org/10.1021/ma0203400" @default.
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