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Bulk morphologies of polystyrene-block-polybutadiene-block-poly(tert-butyl methacrylate) triblock terpolymers

Title data

Löbling, Tina I. ; Hiekkataipale, Panu ; Hanisch, Andreas ; Bennet, Francesca ; Schmalz, Holger ; Ikkala, Olli ; Gröschel, André H. ; Müller, Axel H. E.:
Bulk morphologies of polystyrene-block-polybutadiene-block-poly(tert-butyl methacrylate) triblock terpolymers.
Department of Applied Physics, Aalto University School of Science, 02150 Espoo, Finland; Institut für Organische Chemie, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany
In: Polymer. Vol. 72 (2015) . - pp. 479-489.
ISSN 0032-3861
DOI: https://doi.org/10.1016/j.polymer.2015.02.025

Project information

Project financing: Deutsche Forschungsgemeinschaft
Academy of Finland's Centre of Excellence Programme
ERC-2011-AdG (291364-MIMEFUN)

Abstract in another language

The self-assembly of block copolymers in the bulk phase enables the formation of complex nanostructures with sub 100 nm periodicities and long-range order, both relevant for nanotechnology applications. Here, we map the bulk phase behavior of polystyrene-block-polybutadiene-block-poly(tert-butyl methacrylate) (SBT) triblock terpolymers on a series of narrowly distributed polymers with widely different block volume fractions, ϕS, ϕB and ϕT. In dependence of ϕ, we find the lamella–lamella, core-shell cylinder, cylinder-in-lamella and core-shell gyroid morphology, but also a rarely observed cylinder-in-lamella phase. The bulk morphologies are thoroughly characterized by transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS) and display unusually broad stability regions, i.e. morphologies are observed over a broad range of compositions. We attribute this phase behavior to the asymmetric distribution of block–block incompatibilities, along the SBT block sequence, which are relatively large for S/B and S/T interfaces, but small for B/T. The higher enthalpic penalties at the S/B and S/T interface cause B to preferentially spread on the T microdomain thereby adopting its geometry. The morphological behavior of SBT is thus dominated by the volume ratio of the end blocks, ϕS and ϕT, which reduces the number of potential morphologies to only a few, mostly the core-shell analogue of diblock copolymer morphologies. In general, a simplified terpolymer bulk behavior with large stability regions for morphologies offers straightforward synthetic targeting of specific morphologies that usually only appear in a small parameter space as demonstrated here on the core-shell gyroid.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 12 Dec 2019 08:36
Last Modified: 12 Dec 2019 08:36
URI: https://eref.uni-bayreuth.de/id/eprint/53565