STUDIES OF THE BREAKDOWN MECHANISM OF POLYMERS. 3. THE THERMAL DECOMPOSITION OF AROMATIC POLYAMIDES AND POLYIMIDES
Abstract
The breakdown mechanism of an aromatic polyamide and four polyimides has been studied. The decomposition of the polyamide in the temperature range below 375deg, C yield predominantly carbon dioxide, while between 375 and 450 deg C abo ut equal amounts of carbon dioxide and carbon monoxide formed. Hydrogen is the major product between 450 and 550 deg C, along with hydrogen cyanide, methane, and carbon monoxide. The major reaction at the lower temperatures seems to be the cleavage of the linkage between the carbonyl group and the ring, with subsequent formation of a carbodiimide linkage via isocyanate intermediates. At higher temperatures, cleavage between the carbonyl and the - NH- group takes place.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1968
- Accession Number
- AD0833785
Entities
People
- Gerhard F. L. Ehlers
- Kurt R. Fisch
- Wilbert R. Powell
Organizations
- Air Force Research Laboratory