Reduced viscosity of the free surface in entangled polymer melt films

Tadanori Koga; C. Li; M. K. Endoh; J. Koo; M. Rafailovich; S. Narayanan; D. R. Lee; L. B. Lurio; S. K. Sinha

doi:10.1103/PhysRevLett.104.066101

Reduced viscosity of the free surface in entangled polymer melt films

Tadanori Koga
, C. Li
, M. K. Endoh
, J. Koo
, M. Rafailovich
, S. Narayanan
, D. R. Lee
, L. B. Lurio
, S. K. Sinha

Materials Science and Engineering

Stony Brook University
United States Department of Energy
Northern Illinois University
University of California at San Diego

Research output: Contribution to journal › Article › peer-review

83 Scopus citations

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.

Original language	English
Article number	066101
Journal	Physical Review Letters
Volume	104
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.104.066101
State	Published - Feb 9 2010

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10.1103/PhysRevLett.104.066101

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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.",

author = "Tadanori Koga and C. Li and Endoh, \{M. K.\} and J. Koo and M. Rafailovich and S. Narayanan and Lee, \{D. R.\} and Lurio, \{L. B.\} and Sinha, \{S. K.\}",

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T1 - Reduced viscosity of the free surface in entangled polymer melt films

AU - Koga, Tadanori

AU - Li, C.

AU - Endoh, M. K.

AU - Koo, J.

AU - Rafailovich, M.

AU - Narayanan, S.

AU - Lee, D. R.

AU - Lurio, L. B.

AU - Sinha, S. K.

PY - 2010/2/9

Y1 - 2010/2/9

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/76649130211

U2 - 10.1103/PhysRevLett.104.066101

DO - 10.1103/PhysRevLett.104.066101

M3 - Article

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SN - 0031-9007

VL - 104

JO - Physical Review Letters

JF - Physical Review Letters

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ER -

Reduced viscosity of the free surface in entangled polymer melt films

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