Vitrification of liquids

The vitrification of liquids and polymers can be effected not only by the decrease of temperature but also by the increase of pressure [4]. Shishkin and Novak [5] obser ved the dependence of free hydroxyl concentration upon pressure. This effect can be described by Eq. (6) or (8) in the same way as the course of vitrification upon decreasing temperature. 

The hydrogen bonds play the most important role in the process of the vitrification of liquids and polymers. This process is characterized by the sharp increase of the relaxation times with the decrease of temperature or the increase of pressure and is determined in many systems by the existence of hydrogen bonds. 

---