We have developed a sensitive experiment which allows the measurement of the growth of holes in thin freely standing polystyrene (PS) films at elevated temperatures. In the experiment, a constant small pressure difference is applied and maintained across the freely standing film, and the formation and growth of holes is detected as a flow of air through the film. From measurements of freely standing PS films for which the glass transition temperature is equal to the bulk value as well as for films that are sufficiently thin that is less than we find that substantial chain mobility occurs only at temperatures that are comparable to The results can be interpreted as a shear thinning effect, which is consistent with previous optical microscopy measurements of hole growth in freely standing PS films.
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Research Article|
May 01 2003
Differential pressure experiment to probe hole growth in freely standing polymer films
C. B. Roth;
C. B. Roth
Department of Physics and the Guelph-Waterloo Physics Institute, University of Guelph, Guelph, Ontario, Canada N1G 2W1
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B. G. Nickel;
B. G. Nickel
Department of Physics and the Guelph-Waterloo Physics Institute, University of Guelph, Guelph, Ontario, Canada N1G 2W1
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J. R. Dutcher;
J. R. Dutcher
Department of Physics and the Guelph-Waterloo Physics Institute, University of Guelph, Guelph, Ontario, Canada N1G 2W1
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K. Dalnoki-Veress
K. Dalnoki-Veress
Department of Physics and Astronomy and Brockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada L8S 4M1
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Rev. Sci. Instrum. 74, 2796–2804 (2003)
Article history
Received:
August 26 2002
Accepted:
January 21 2003
Citation
C. B. Roth, B. G. Nickel, J. R. Dutcher, K. Dalnoki-Veress; Differential pressure experiment to probe hole growth in freely standing polymer films. Rev. Sci. Instrum. 1 May 2003; 74 (5): 2796–2804. https://doi.org/10.1063/1.1568541
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