Abstract
The transition to the glassy state has been found in viscous crude oil with the transient hot-wire technique. The thermal conductivity and the specific heat per unit volume of the heavy Usinsk oil have been measured up to 1 GPa in the temperature range 200–400 K. The glass transition temperature was defined as the temperature of halfway change of the specific heat. It has also been found that the higher the pressure, the narrower the glass transition region, i.e., the steeper the specific-heat change in this region. The nature of glass transitions in crude oils is discussed.
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