Reversible sphere-to-lamellar wetting transition at the interface of a diblock copolymer system |
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Authors: | J L Carvalho M V Massa S L Cormier M W Matsen K Dalnoki-Veress |
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Institution: | Department of Physics & Astronomy and the Brockhouse Institute for Materials Research, McMaster University, Hamilton, ON, Canada. |
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Abstract: | We use ellipsometry to investigate a transition in the morphology of a sphere-forming diblock copolymer thin-film system.
At an interface the diblock morphology may differ from the bulk when the interfacial tension favours wetting of the minority
domain, thereby inducing a sphere-to-lamella transition. In a small, favourable window in energetics, one may observe this
transition simply by adjusting the temperature. Ellipsometry is ideally suited to the study of the transition because the
additional interface created by the wetting layer affects the polarisation of light reflected from the sample. Here we study
thin films of poly(butadiene-ethylene oxide) (PB-PEO), which order to form PEO minority spheres in a PB matrix. As temperature
is varied, the reversible transition from a partially wetting layer of PEO spheres to a full wetting layer at the substrate
is investigated. |
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Keywords: | |
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