Transient Crystallization of an Aromatic Polyetherimide: Effect of Annealing

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1991
Accession Number
ADA231988

Entities

People

  • Alex J. Hsieh
  • C. R. Desper
  • Nathaniel S. Schneider

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Beta Testing
  • Chlorides
  • Crystal Growth
  • Crystal Structure
  • Crystallization
  • Crystals
  • Diffraction
  • Glass Transition Temperature
  • Heat Energy
  • Heat Of Fusion
  • Materials
  • Materials Science
  • Melting
  • Military Research
  • Phase Transformations
  • Transition Temperature
  • Transitions

Readers

  • Materials Science and Engineering.
  • Mathematics or Statistics
  • Polymer Science and Engineering.