Studies of the degradation of copolymers of acrylonitrile and acrylamide in air at 200°C. Speculations on the role of the preoxidation step in carbon fiber formation
✍ Scribed by G.T. Sivy; B. Gordon III; M.M. Coleman
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 472 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0008-6223
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✦ Synopsis
Fourier transform infrared (FT-IR) results of the thermal degradation of polyacrylonitrile (PAN) copolymers containing varying concentrations of acrylamide (AM) degraded at 200°C in air are presented. These results suggest that reactions other than intramolecular ring formation and intermolecular crosslinking are important. Products from reactions similar to those formed from autoxidation result in the formation of oletins and conjugated polyenes. It is speculated that these structures are precursors to the formation of fused ring systems necessary for high strength Carbon/Graphite (C/G) fibers. A degradation scheme based on the IR results is advanced.