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• W2014744070 abstract "We have demonstrated an advanced iterative methodology using specially designed 1-[4-(3-bromopropyl)phenyl]-1-phenylethylene (1) or 3,5-bis{3-[4-(1-phenylethenyl)phenyl]propoxy}benzyl bromide (2) of alternative choice at each iteration for the successive synthesis of asymmetric star polymers. The methodology involves only two sets of the following reaction conditions for the entire iterative reaction sequence: (a) a linking reaction of a living anionic polymer with a DPE-chain-functionalized polymer and (b) an in-situ reaction of 1 or 2 with the anion generated by the linking reaction to reintroduce the DPE functionality. The number of DPE moieties remains unchanged when 1 is used, whereas it doubles when 2 is used. In practice, various arrays of asymmetric star polymers could be successfully synthesized by repeating the iterative reaction sequence, (a) and (b), five times. The structural variation of the stars covers 3-arm AB2, 5-arm AB2C2, 5-arm AB2C4, 7-arm AB2C2D2, 9-arm AB2C2D4, 11-arm AB2C4D4, 15-arm AB2C4D8, 9-arm AB2C2D2E2, 11-arm AB2C2D2E4, 13-arm AB2C2D4E4, 15-arm AB2C4D4E4, 17-arm AB2C2D4E8, 19-arm AB2C4D4E8, 23-arm AB2C4D8E8, and 31-arm AB2C4D8E16 types. The A, B, C, D, and E segments were polystyrene, poly(α-methylstyrene), poly(4-methylstyrene), poly(4-methoxystyrene), and poly(4-trimethylsilylstyrene) segments, respectively. We have corroborated that all of the samples show a high degree of structural and compositional homogeneity by 1H NMR and SEC-RALLS. The systematic synthesis of multicomponent and multiarmed stars supports the utility and universality of the proposed methodology." @default.
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• W2014744070 date "2009-06-25" @default.
• W2014744070 modified "2023-10-09" @default.
• W2014744070 title "Successive Synthesis of Asymmetric Star-Branched Polymers Based on Iterative Methodology Using 1,1-Diphenylethylene Derivatives of Alternative Choice at Each Iteration" @default.
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• W2014744070 doi "https://doi.org/10.1021/ma900750n" @default.
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