Synthesis and characterization of AxBAx-type polymer with block and graft structure

Yu Miura, Kotaro Satoh, Masami Kamigaito, Yoshio Okamoto, Takeshi Kaneko, Hiroshi Jinnai

Research output: Contribution to conferencePaperpeer-review


In this study, AxBAx-type copolymers with controlled length of graft and backbone chains were synthesized by ruthenium-catalyzed living radical polymerization. The polymerization of dodecyl methacrylate (DMA) was carried out with a bifunctional initiator (1) having two C-Cl bonds and Ru(Ind)Cl(PPh3)2, followed by the addition of 2 to afford the backbone chain (Scheme 1). The C-Br bonds were then introduced into the both sides of the backbone chain to give the multifunctional macroinitiator II. The Ru-catalyzed graft copolymerization from II gave the AxBAx-type copolymer III with controlled length of both the backbone and the graft chains. The DSC analysis of the AxBAx copolymers showed the two transition points attributed to the TgS of poly(DMA) and polystyrene segments. The TEM indicate the characteristic microphase separation, which is different from that for the ABA triblock copolymer. These indicate that such a new copolymer can constract a specific nano-ordered microstructure by self-association.

Original languageEnglish
Number of pages2
Publication statusPublished - 2006 Dec 1
Externally publishedYes
Event55th Society of Polymer Science Japan Symposium on Macromolecules - Toyama, Japan
Duration: 2006 Sep 202006 Sep 22


Other55th Society of Polymer Science Japan Symposium on Macromolecules


  • Block copolymer
  • Graft copolymer
  • Living radical polymerization
  • Microphase separation
  • Ruthenium complex
  • Thermoplastic elastomer

ASJC Scopus subject areas

  • Engineering(all)


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