Transient Crystallization of an Aromatic Polyetherimide: Effect of Annealing
ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
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A systematic study using differential scanning calorimetry DSC has been performed on the annealing behavior of an aromatic polyethermide Ultem 5001. Although crystallization from the melt did not occur crystallinity was easily induced in the presence of methylene chloride. With annealing, a sharp melt endotherm of the solvent-treated polythermide was observed. The melt temperature determined after annealing for 30 minutes increased progressively as the annealing temperature increased leading after annealing for to an extrapolation to an apparent equilibrium melt temperature of 369 C. However, the melt temperature, as well as crystallinity, increased with the increase of the residence time at each annealing temperature.
- Organic Chemistry