FIRST INELASTIC NEUTRON SCATTERING STUDIES ON
THIN FREE STANDING POLYMER FILMS

K. Dalnoki-Veress, B. Frick, J. Forrest, J. Dutcher, C. Murray and A. Higgins,
ILL Millenium Symposium Technical Report (2001).
ABSTRACT

Glass transition studies in free standing polymer films have revealed values of the transition temperature Tg which were substantially reduced below the bulk for sufficiently thin films. Measurements at high molecular weight Mw revealed a significant dependence on Mw suggesting that chain confinement was the dominating effect in the anomalous dynamics found. Here we report on the first tests by inelastic neutron scattering on stacks of free standing polystyrene films with thicknesses of 55 nm and 107 nm. We have employed the TOF spectrometer IN6 and the backscattering spectrometer IN16.

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