Abstract
High pressure X-ray measurement of n-perfluoroeicosane (C20F42) was carried out at pressures up to 500 MPa. Pressure-induced changes in the lateral packing of molecular chains and in the long period of lamellae layer structure were examined for some isothermal compressing processes. The molecular conformation and lateral packing in a high pressure phase were presumed to be the same as phase III (high pressure phase) of poly(tetrafluoroethylene). Second-order transition points, whose existence was surmised from the results of high pressure dilatometry in the preceding work, were also detected clearly. An improved phase diagram including these second-order transition points was determined.
Similar content being viewed by others
Article PDF
References
C. E. Weir, J. Res. Natl. Bur. Stand., 50, 95 (1953).
S. Hirakawa and T. Takemura, Jpn. J. Appl. Phys., 8, 635 (1969).
E. S. Clark and L. T. Muus, Z. Krist., 117, 119 (1962).
C. Nakafuku and T. Takemura, Jpn. J. Appl. Phys., 14, 599 (1975).
H. W. Starkweather, Jr., Macromolecules, 19, 1131 (1986).
H. Schwickert, G. Strobl, and M. Kimmig, J. Chem. Phys., 95, 2800 (1991).
S. Tsubakihara and M. Yasuniwa, Polym. J., 24, 421 (1992).
S. Tsubakihara, K. Higashi, S. Taki, K. Matsushige, and M. Yasuniwa, Polym. J., in press.
H. Tanaka, K. Takayama, T. Okamoto, and T. Takemura, Polym. J., 14, 719 (1982).
G. Strobl, B. Ewen, E. W. Fischer, and W. Piesczek, J. Chem. Phys., 61, 5257 (1974).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Tsubakihara, S., Yasuniwa, M. High Pressure X-Ray Measurement of n-Perfluoroeicosane. Polym J 24, 1215–1221 (1992). https://doi.org/10.1295/polymj.24.1215
Issue Date:
DOI: https://doi.org/10.1295/polymj.24.1215