Jpn. J. Appl. Phys. 16 (1977) pp. 1891-1898 |Next Article| |Table of Contents|
|Full Text PDF (1397K)| |Buy This Article|
Structure and Properties of High Pressure Phase of Polyethylene
Department of Physics, Faculty of Science, Kyoto University
(Received July 15, 1977)
The structure, phase diagram and compression behavior of polyethylene are studied by X-ray diffraction up to 11 kbar and 300°C. Distinct diffuse scattering on the non-equatorial line is first observed for the hexagonal phase of oriented polyethylene, revealing conformational disorder of the molecule. The phase diagram determined shows that the hexagonal phase exists in a temperature range which increases with increasing pressure up to 11 kbar. It is found that the compressibility of the hexagonal phase takes higher values on the lower pressure side, and approaches the value for the orthorhombic phase with increasing pressure. A simple relation between the lattice parameters of the orthorhombic phase, ao/bo=1.57-1.58, is found to hold at the transition temperature to the hexagonal phase irrespective of pressure.
- D. C. Bassett, S. Block and G. J. Piermarini:
J. Appl. Phys. 45 (1974) 4146[AIP Scitation].
- M. Yasuniwa, R. Enoshita and T. Takemura:
Jpn. J. Appl. Phys. 15 (1976) 1421[JSAP].
- T. Yamamoto, H. Miyaji and K. Asai: Rep. Prog. Polym. Phys. Japan 19 (1976) 191.
- D. C. Bassett and B. Turner: Philos. Mag. 29 (1974) 925.
- H. Miyaji: J. Phys. Soc. Jpn. 39 (1975) 1346.
- E. G. Steward and B. P. Cook: Nature 185 (1960) 78.
- R. R. Nelson, W. Webb and J. A. Dixon:
J. Chem. Phys. 33 (1960) 1756[AIP Scitation].
- E. S. Clark and L. T. Muus: Z. Krist. 117 (1962) 108.
- E. S. Clark and L. T. Muus: Z. Krist. 117 (1962) 119.
- P. H. Lindenmeyer and R. Hosemann:
J. Appl. Phys. 34 (1963) 42[AIP Scitation].
- T. Ito: J. Cryst. Soc. Japan 16 (1974) 318 [in Japanese].