Document Type
Article
Abstract
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 (Tg). 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 Tg.
DOI
10.1103/PhysRevLett.104.066101
Publication Date
1-1-2010
Recommended Citation
T. Koga, D. Li. M.K. Endoh, J. Koo, M Rafailovich, S. Narayanan, D.R. Lee, L..B. Lurio and S.K. Sinha, "Reduced Viscosity of the Free Surface in Entangled Polymer Melt Films", Phys. Rev. Lett. 104, 066101 (2010)
Original Citation
T. Koga, D. Li. M.K. Endoh, J. Koo, M Rafailovich, S. Narayanan, D.R. Lee, L..B. Lurio and S.K. Sinha, "Reduced Viscosity of the Free Surface in Entangled Polymer Melt Films", Phys. Rev. Lett. 104, 066101 (2010)
Legacy Department
Department of Physics
Sponsorship
T. K. acknowledges financial support from NSF Grant No. CMMI-0846267 and ChemMatCARS, APS. The use of the APS was supported by the DOE, Office of Basic Energy Science, under Contract No. DE-AC02- 06CH11357.
ISSN
0031-9007
Language
eng
Publisher
American Physical Society
