A modification to the standard procedure for the use of the density gradient column is described. Silicone oils are used as column liquids to provide an inert environment for the polymer samples, and the column is operated at 53°C. This system is used successfully to monitor the volume relaxation during ageing of polystyrene following a quench.
Посилання на статтю:
On the use of a density gradient column to monitor the physical ageing of polystyrene / U. Kriesten and J. M. Hutchinson* // Polymer. – 1992. – Vol 33. – P. 4875-4877.