Microphase-separated structures in star block copolymers

Taishi Hashimoto, Hiroshi Jinnai, Yukihiro Nishikawa, Shigeru Suzuki, Masaoki Takahashi, Toshio Nishi

Research output: Contribution to conferencePaperpeer-review


Influence of the topology of block chains of the block copolymers on the microphase-separated structures was studied by transmission electron microtomography (TEMT). A basic unit of the sample is poly(styrene-b-butadiene) (SB) with an active terminal at the end of butadiene. By increasing the number of units, the block copolymer systematically changes from diblock (1 unit, say 1-arm) copolymer, to triblock (2-arm), and star block (3- and more arm) copolymers as shown in Fig. 1. As shown in Fig. 2, the 1-arm block copolymer, that is the diblock copolymer, exhibited gyroid morphology. With increasing the number of arms, the morphology changed from gyroid structure to a cylindrical structure and network structure. In addition, we evaluated the curvature distributions of each block copolymers. Consequently, the curvature distributions broadened with the number of arms.

Original languageEnglish
Number of pages1
Publication statusPublished - 2006 Oct 18
Externally publishedYes
Event55th SPSJ Annual Meeting - Nagoya, Japan
Duration: 2006 May 242006 May 26


Other55th SPSJ Annual Meeting


  • Mean curvature distribution
  • Star block copolymer
  • Transmission Electron Microtomography

ASJC Scopus subject areas

  • Engineering(all)


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