Impact of an irreversibly adsorbed layer on local viscosity of nanoconfined polymer melts |
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Authors: | Koga Tadanori Jiang N Gin P Endoh M K Narayanan S Lurio L B Sinha S K |
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Institution: | Chemical and Molecular Engineering Program, Stony Brook University, Stony Brook, New York 11794-2275, USA. tkoga@notes.cc.sunysb.edu |
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Abstract: | We report the origin of the effect of nanoscale confinement on the local viscosity of entangled polystyrene (PS) films at temperatures far above the glass transition temperature. By using marker x-ray photon correlation spectroscopy with gold nanoparticles embedded in the PS films prepared on solid substrates, we have determined the local viscosity as a function of the distance from the polymer-substrate interface. The results show the impact of a very thin adsorbed layer (~7 nm in thickness) even without specific interactions of the polymer with the substrate, overcoming the effect of a surface mobile layer at the air-polymer interface and thereby resulting in a significant increase in the local viscosity as approaching the substrate interface. |
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