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Authors
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Ionov, L. ; Sidorenko, A. ; Eichhorn, K.-J. ; Stamm, M. ; Minko, S. ; Hinrichs, K.
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Title
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Stimuli Responsive Mixed Grafted Polymer Films with Gradually Changing Properties: Direct Determination of Chemical Composition
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Date
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22.09.2005
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Number
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13299
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Abstract
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Infrared spectroscopic ellipsometry (IRSE) and visible monochromatic ellipsometry (VISE) approacheswere applied to investigate the chemical structure and thickness of ultrathin polymer films. Mixedpolystyrene-poly(2-vinylpyridine) and polystyrene-poly(<I>tert</I>-butyl acrylate) polymer grafted films (mixedbrushes) with gradually changing composition (1D gradient mixed brush) along the sample were preparedon a temperature gradient stage via two subsequent "grafting to" reactions. The films were characterizedby high-precision mapping VISE at a single wavelength (632.8 nm) and IRSE. The set of 1D IRSE spectraof the polymer brush films obtained by mapping the 1D gradient brush were used to estimate the thicknessand the local composition of the film and to construct the 1D map of the film in terms of the chemicalcomposition of the brush. The results were compared with the data obtained using monochromaticellipsometry where the brush composition was estimated from the results of two subsequent measurementsfollowed each grafting step. The measurements of the brush thickness and composition with both methodswere found to be in gratifying agreement. The results demonstrate the high potential of IRSE methodsfor the one-step characterization (by thickness and chemical composition) of ultrathin polymer films ofcomplex composition.
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Publisher
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Langmuir
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Wikidata
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Citation
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Langmuir 21 (2005) 8711-8716
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DOI
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https://doi.org/10.1021/la050620j
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Tags
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polyelectrolyte brushes infrared ellipsometry porous membrane surfaces layers reorganization gold
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