The tricontinuous 3 ths (5) phase: A new morphology in copolymer melts

Michael G. Fischer, Liliana De Campo, Jacob J.K. Kirkensgaard, Stephen T. Hyde, Gerd E. Schröder-Turk*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)

    Abstract

    Self-assembly remains the most efficient route to the formation of ordered nanostructures, including the double gyroid network phase in diblock copolymers based on two intergrown network domains. Here we use self-consistent field theory to show that a tricontinuous structure with monoclinic symmetry, called 3ths(5), based on the intergrowth of three distorted ths nets, is an equilibrium phase of triblock star-copolymer melts when an extended molecular core is introduced. The introduction of the core enhances the role of chain stretching by enforcing larger structural length scales, thus destabilizing the hexagonal columnar phase in favor of morphologies with less packing frustration. This study further demonstrates that the introduction of molecular cores is a general concept for tuning the relative importance of entropic and enthalpic free energy contributions, hence providing a tool to stabilize an extended repertoire of self-assembled nanostructured materials.

    Original languageEnglish
    Pages (from-to)7424-7430
    Number of pages7
    JournalMacromolecules
    Volume47
    Issue number21
    DOIs
    Publication statusPublished - 11 Nov 2014

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