First inelastic neutron scattering studies on thin free standing polymer films
Institut Laue-Langevin, 6 rue Jules Horowitz, 38042 Grenoble, France
2 Department of Physics & Astronomy and the Brockhouse Institute for Materials Research, McMaster University, Hamilton, ON, L8S 4M1, Canada
3 Department of Physics and Guelph-Waterloo Physics Institute, University of Waterloo, Waterloo, ON, N2L 3G1, Canada
4 Department of Physics and Guelph-Waterloo Physics Institute, University of Guelph, Guelph, ON, N1G 2W1, Canada
5 Department of Physics and Astronomy, University of Sheffield, Sheffield, S3 7RH, U.K.
Published online: 5 November 2003
Glass transition studies in free standing polymer films have revealed values of the transition temperature, T g , which were substantially reduced below the bulk for sufficiently thin films. Here we report on the preparation of two stacks of free standing polystyrene films: 70 films with a thickness of h ∼ 107 nm and 140 films with h ∼ 55 nm with equivalent total sample thicknesses of approximately 7.5 μm. We have performed the first measurements on such samples using inelastic neutron scattering, and demonstrate that inelastic neutron scattering experiments, performed on the time-of-flight spectrometer IN6 and the backscattering spectrometer IN16 at the Institut Laue-Langevin, are feasible.
PACS: codes. – 82.35.Lr - Physical properties of polymers / codes. – 64.70.Pf - Glass transitions / codes. – 68.60.Bs - Mechanical and acoustical properties
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003