Target Patterns in Phase Separation Induced by Cross-Linking

Miho Motoyama*, Yoshihiro Yamazaki, Takao Ohta

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We introduce a quite simple model for a phase-separating binary mixture where one of the components is cross-linked. It is shown by computer simulations that target patterns are generated. We use a Cahn-Hilliard equation with a bulk free energy density which varies as a molecular weight changes with time. Target patterns are obtained in the following way. We first quench the system, having an off-critical composition, into a spinodal region, and find that disconnected droplets emerge in the system. With cross-linking one of the components, the phase diagram of the system shifts to a location where a bicontinuous structure is formed. As a result, target patterns grow from the droplets without any additional nuclei.

Original languageEnglish
Pages (from-to)729-732
Number of pages4
Journaljournal of the physical society of japan
Issue number3
Publication statusPublished - 2001 Mar 1
Externally publishedYes


  • Cross-linking
  • Phase separation
  • Polymer blend
  • Target pattern

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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