The chemical composition of the surface of an amphiphilic diblock copolymer film, comprised of polystyrene and poly(4-(2-(2-(2-acetoxy)ethoxy)ethoxy) styrene), has been characterized upon equilibration in water and in a vacuum, employing surface sensitive near-edge X-ray absorption fine structure spectroscopy. The outermost surface layer exhibits a reversible exchange between the hydrophilic and hydrophobic polymer segments as the equilibrating interface is changed between water and vacuum, respectively. Surprisingly, time-dependent measurements show that a substantial partial molecular reorganization toward a vacuum-equilibrated surface occurs already at 60°C, which is significantly below the glass transition temperature of the polystyrene block. © 2006 American Chemical Society.
CITATION STYLE
Theato, P., Brehmer, M., Conrad, L., Frank, C. W., Funk, L., Yoon, D. Y., & Lüning, J. (2006). Surface reorganization of an amphiphilic block copolymer film studied by NEXAFS spectroscopy. Macromolecules, 39(7), 2592–2595. https://doi.org/10.1021/ma0509964
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