Abstract
The pressure dependence of the glass transition temperature, Tg, and the coefficients of thermal expansion, α, and the compressibility, β, of polystyrene were measured. For the same sample, DSC measurement was also carried out, to obtain specific heat, Cp. From the results, it was confirmed that the relation (∂Tg/∂P)≅TVΔα/ΔCp<Δβ/Δα was valid, in accordance with our theory based on a hole model for polymer liquids and glasses with an assumption of iso-configurational entropy at Tg. Changes of specific heats at Tg associated with intrasegmental interactions and inter-segmental ones were calculated separately by the use of the theory, and ΔCpintra=0.041 and ΔCpintra=0.036 cal/gK were obatined.
Similar content being viewed by others
Article PDF
References
F. E. Karasz, H. E. Bair, and J. M. O'Reilly, J. Phys. Chem., 69, 2657, (1965).
G. Gee, Polymer, 7, 177, (1966).
K. H. Hellwedge, W. Knappe, and P. Lehman, Kolloid Z. Z. Polym., 183, 110 (1962).
J. M. O’Reilly, “Effect of Pressure on Amorphous Polymers” in Modern Aspects of the Vitreous State, J. D. Mackenzie Ed., Butterworths Scientific Publications Ltd., London, 1964, p 59.
N. I. Shishkin, Sov. Phys. Solid State, 2, 322 (1960).
T. Nose, Polym. J., 2, 445 (1971).
see also T. Nose and T. Hata, “Proceedings of the 5th International Congress of Rheology, University of Tokyo Press, Tokyo, 3, 215, 1970.
M. Goldstein, J. Chem. Phys., 39, 3369, (1963).
A. Goldberg, W. Hohenstein, and H. Mark, J. Polym. Sci., 2, 503 (1947).
M. J. O’Neill, Anal. Chem., 38, 1331, (1966).
D. C. Ginnings and G. T. Furukawa, J. Am. Chem. Soc., 75, 522, (1953).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Ichihara, S., Komatsu, A., Tsujita, Y. et al. Thermodynamic Studies on the Glass Transition and the Glassy State of Polymers. I. Pressure Dependence of the Glass Transition Temperature and Its Relation to Other Thermodynamic Properties of Polystyrene. Polym J 2, 530–534 (1971). https://doi.org/10.1295/polymj.2.530
Issue Date:
DOI: https://doi.org/10.1295/polymj.2.530
Keywords
This article is cited by
-
The role of lignin in wood working processes using elevated temperatures: an abbreviated literature survey
European Journal of Wood and Wood Products (2021)
-
DSC study of the effect of irradiation upon the glass transition temperature (T g) of polyethylene
Journal of Thermal Analysis (1975)