3D nanometer-scale study of coexisting bicontinuous morphologies in a block copolymer/homopolymer blend

Hiroshi Jinnai, Hirokazu Hasegawa, Yukihiro Nishikawa, G. J. Agur Sevink, Michael B. Braunfeld, David A. Agard, Richard J. Spontak

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

Coexisting bicontinuous morphologies, one ordered and one disordered, are investigated in a macrophaseseparated poly(styrene-block-isoprene) diblock copolymer/homopolystyrene (SI/hS) blend. Two-phase behavior is attributed to the relatively high hS/S mass ratio (0.92). According to its crystallographic signature and channel coordination as discerned from three-dimensional (3D) images generated by transmission electron microtomography (TEMT), the ordered morphology is classified as gyroid. The 3D local and global topological characteristics of both bicontinuous morphologies as measured directly from TEMT images are reported. The disordered morphology is further compared with molecular-field simulations to ascertain the spatial distribution of the constituent species within the blend, thereby demonstrating the utility of high-resolution 3D imaging coupled with molecular-level simulations.

Original languageEnglish
Pages (from-to)1424-1429
Number of pages6
JournalMacromolecular Rapid Communications
Volume27
Issue number17
DOIs
Publication statusPublished - 2006 Sep 4
Externally publishedYes

Keywords

  • Bicontinuous networks
  • Block copolymers
  • Phase separation
  • Simulations
  • TEM

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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