Novel synthesis and characterization of hyperbranched polymers

K. Ishizu, D. Takahashi, H. Takeda

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


We approached a novel synthesis of hyperbranched polymers via living anionic polymerization. The first-generated star polymer (1G-S) was prepared by copolymerization of poly(4-methylstyrene)-block-polystyrene diblock anions with a small amount of divinylbenzene. The peripheral 4-methylstyrene units in the arm were metalated with s-butyllithium/tetramethylethylenediamine complex in cyclohexane. The second-generated hyperbranched polymers (2G-H) were prepared by equilibrium polymerization of such 1G-S polyanions with α-methylstyrene in tetrahydrofuran at -78 °C, and subsequently the terminal branch ends were capped with a small amount of 4-methylstyrene. The characterization of such hyperbranched polymers was carried out in detail. The ratio values of radius of gyration (RG) to hydrodynamic radius (RH) for the 2G-H were in the range of 0.96-1.18. The 2G-H behaved like soft spheres or loose star-structures that were constructed with flexible chains in the inner parts.

Original languageEnglish
Pages (from-to)6081-6086
Number of pages6
Issue number16
Publication statusPublished - 2000 Jul
Externally publishedYes


  • Anionic polymerization
  • Hyperbranched polymers
  • Star polymer

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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