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Authors
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Müller-Buschbaum, P. ; Wunnicke, O. ; Stamm, M. ; Lin, Y.-C. ; Müller, M.
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Title
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Stability-Instability Transition by Tuning the Effective Interface Potential in Polymeric Bilayer Films
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Date
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18.05.2005
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Number
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13243
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Abstract
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The wetting behavior of a liquid polymer on top of a supported glassy polymer film isinvestigated with real (optical microscopy, phase measuring interference microscopy, and scanning forcemicroscopy) and reciprocal space analysis techniques (X-ray reflectivity and grazing incidence small-angle X-ray scattering). The thermodynamic stability of the top film is determined by the interface potentialthat results from an interplay between short-range and long-range van der Waals contributions. Itcomprises two competing minima which correspond to a film of vanishingly small, microscopic thicknessand to a film with a larger, mesoscopical thickness of a few nanometers. At high temperatures, the liquidtop-layer forms drops sitting on top of this mesoscopically thin film. The short-range contribution influencesthe equilibrium state, and the long-range part of the interface potential determines the kinetics ofdewetting. By varying the thickness of the glassy, polymeric sublayer, the effective interface potential istuned, and a dewetting of the top layer is observed. Additionally, we find the kinetics of hole growth tobe compatible with a reduction of the PA sublayer viscosity compared to the bulk.
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Publisher
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Macromolecules
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Wikidata
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Citation
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Macromolecules 38 (2005) 3406-3413
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DOI
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https://doi.org/10.1021/ma047602d
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Tags
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x-ray-scattering poly(methyl methacrylate) monte-carlo thin-films dewetting dynamics phase-separation polystyrene thickness forces renormalization
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