期刊
APPLIED SURFACE SCIENCE
卷 254, 期 21, 页码 6820-6825出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2008.04.073
关键词
polymer blend; polymer demixing; thin films; gradients; topography; surface energy
类别
资金
- European Network Polynano
We report the fabrication of centimeter-long gradients of topography. Structured polymer thin films were made by spin-coating an immiscible poly( methyl methacrylate)/poly(2-vinylpyridine) (PMMA/P2VP) blend from a common solvent on a substrate presenting a surface-energy gradient. Due to the interplay between polymer-wetting of the substrate and polymer phase-separation, different morphologies were observed along the sample. Atomic force microscopy (AFM) revealed a gradual transition from a. at to a structured morphology as the surface energy of the substrate was reduced. The transition occurred for a well-defined range of surface energies. A selective solvent was used to remove one of the polymer phases, increasing the topographical contrast and providing insight into the different stages of the transition. Image analysis allowed a quantitative characterization of the structure gradient. (C) 2008 Elsevier B. V. All rights reserved.
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