Effect of atmosphere on reductions in the glass transition of thin polystyrene films
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We have used nulling ellipsometry to measure the glass transition temperature, T g , of thin films of polystyrene in ambient, dry nitrogen, and vacuum environments. For all environments, the measured T g values decrease with decreasing film thickness in a way that is quantitatively similar to previously reported studies in ambient conditions. These results provide strong reinforcement of previous conclusions that such reduced T g values are an intrinsic property of the confined material. Furthermore, the results are in contrast to recent reports which suggest that the T g reductions measured by many researchers are the results of artifacts (i.e. degradation of the polymer due to annealing in ambient conditions, or moisture content).
PACS36.20.-r Macromolecules and polymer molecules 64.70.pj Polymers 68.60.-p Physical properties of thin films, nonelectronic
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- 1.J.L. Keddie, R.A.L. Jones, R.A. Cory, Europhys. Lett. 27, 59 (1994).Google Scholar
- 2.J.A. Forrest, K. Dalnoki-Veress, Adv. Colloid Interface Sci. 94, 167 (2001).Google Scholar
- 3.M. Alcoutlabi, G.B. McKenna, J. Phys.: Condens. Matter 17, R461 (2005).Google Scholar
- 4.C.B. Roth, J.R. Dutcher, J. Electroanal. Chem. 584, 13 (2005).Google Scholar
- 5.A. Serghei, H. Huth, M. Schellengerger, C. Schick, F. Kremer, Phys. Rev. E 71, 061801 (2005).Google Scholar
- 6.M.Y. Efremov, Rev. Sci. Instrum. 79, 043903 (2008).Google Scholar
- 7.A. Serghei, H. Huth, C. Schick, F. Kremer, Macromolecules 41, 3636 (2008).Google Scholar
- 8.R.M.A. Azzam, N.M. Bashara, Ellipsometry and Polarized Light (North-Holland Publishing Company, Amsterdam, 1977).Google Scholar
- 9.Z. Fakhraai, J.A. Forrest, Phys. Rev. Lett. 95, 025701 (2005).Google Scholar