Abstract
The experimental techniques are enumerated which were up to present used to investigate the high pressure phase in linear polyethylene. The crystallographic data of this phase which is hexagonal are tabulated. In part they come from wide angle X-ray scattering, in part they are calculated from dilatometric results discussed in detail. The thermodynamic quantities given encompass the phase diagramm including the slope of the curves, the changes in volume, entropy and enthalpy and the linear compressibility and the linear expansion coefficient of the hexagonal phase. Further results are reported found by microscopy, ultrasonic measurements and Raman spectroscopy.
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