期刊
TOPICS IN CATALYSIS
卷 32, 期 3-4, 页码 257-262出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11244-005-2907-4
关键词
supercritical carbon dioxide; inorganic nanoparticles; low-density polymer thin films; glass transition; X-ray reflectivity
We report on an efficient and environmentally friendly means to modify surface properties of polymer films supported for nanoparticles. Ultrathin polystyrene (PS) films (< 300 angstrom) in which inorganic nanoparticles were embedded, were exposed to supercritical carbon dioxide (scCO(2)). The swollen structure was then preserved by quickly evaporating CO2. X-ray reflectivity (XR) results showed that this procedure produced polymeric nanocomposite films with a low-density region of about 150 A at the polymer/air interface. The formation of the low-density layer was independent of the nature of the particles, indicating that the Surface modification through exposure to scCO(2) may be a universal phenomenon regardless of a choice of nanoparticles.
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