The Tricontinuous 3ths(5) Phase: A New Morphology in Copolymer Melts
Date
2014
Authors
Fischer, Michael
De Campo, Liliana
Kirkensgaard, Jacob Judas Kain
Hyde, Stephen
Schroder-Turk, Gerd
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Volume Title
Publisher
American Chemical Society
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.
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Source
Macromolecules
Type
Journal article
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DOI
10.1021/ma5016352
Restricted until
2037-12-31