Reduced viscosity of the free surface in entangled polymer melt films

By embedding "dilute" gold nanoparticles in single polystyrene thin films as "markers", we probe the local viscosity of the free surface at temperatures far above the glass transition temperature (T(g)). The technique used was x-ray photon correlation spectroscopy with resonance-...

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Bibliographic Details
Published in:Physical review letters 2010-02, Vol.104 (6), p.066101-066101, Article 066101
Main Authors: Koga, Tadanori, Li, C, Endoh, M K, Koo, J, Rafailovich, M, Narayanan, S, Lee, D R, Lurio, L B, Sinha, S K
Format: Article
Language:English
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Summary:By embedding "dilute" gold nanoparticles in single polystyrene thin films as "markers", we probe the local viscosity of the free surface at temperatures far above the glass transition temperature (T(g)). The technique used was x-ray photon correlation spectroscopy with resonance-enhanced x-ray scattering. The results clearly showed the surface viscosity is about 30% lower than the rest of the film. We found that this reduction is strongly associated with chain entanglements at the free surface rather than the reduction in T(g).
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.104.066101