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Issue 14, 2011
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From hard to soft confinement in a symmetric block copolymer: local and segmental dynamics

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Abstract

The dynamics of a diblock copolymer in the phase separated lamellar structure and in the mixed state has been studied by dielectric spectroscopy. By choosing a system in which the glass transition temperatures of the two constituent polymers are not very different, we were able to investigate the differences between hard and soft confinement imposed by the more rigid chains. The results indicate that under hard confinement, the segmental dynamics of the low Tg component experiences a slowing down due to interaction with the more rigid chains in both phase separated and mixed cases. For the phase separated case no difference in the dynamics of the low Tg block is observed upon going from the hard to the soft confinement regime. However for the mixed system under soft confinement, i.e. at temperatures higher than the Tg of the more rigid polymer block, a slowing down of the dynamics of the low Tg block polymer towards the dynamics of the more rigid block is clearly evidenced.

Graphical abstract: From hard to soft confinement in a symmetric block copolymer: local and segmental dynamics

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Publication details

The article was received on 02 Mar 2011, accepted on 07 Apr 2011 and first published on 08 Jun 2011


Article type: Paper
DOI: 10.1039/C1SM05368J
Citation: Soft Matter, 2011,7, 6477-6483
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    From hard to soft confinement in a symmetric block copolymer: local and segmental dynamics

    A. Sanz, A. Nogales and T. A. Ezquerra, Soft Matter, 2011, 7, 6477
    DOI: 10.1039/C1SM05368J

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