Abstract
The addition of pressure as a new external parameter allows a variety of approaches of the glass formation phenomenon by means of isothermal, isobaric, isochoric, and isochronic measurements. As a starting point, we have determined the line of glass ‘transition’ pressures up to 600 MPa as defined by isothermal calorimetry at a relaxation time of 1000 s for several molecular glassforming liquids. Careful measurements of the thermodynamic and dynamic properties of the overcompressed liquids have been performed. The observed decrease of the so-called ‘fragile’ character of the liquids when pressure is applied is discussed.
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