Details

Autor(en) / Beteiligte

• Koga, Tadanori
• Jiang, N
• Gin, P
• Endoh, M K
• Narayanan, S
• Lurio, L B
• Sinha, S K

Titel

Impact of an irreversibly adsorbed layer on local viscosity of nanoconfined polymer melts

Ist Teil von

• Physical review letters, 2011-11, Vol.107 (22), p.225901-225901, Article 225901

Ort / Verlag

United States

Erscheinungsjahr

2011

Quelle

PROLA

Beschreibungen/Notizen

• 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.