The effluent analysis of several pyrrone and polyimide precursors during cyclization
Article first published online: 9 MAR 2003
Copyright © 1977 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 21, Issue 9, pages 2393–2404, September 1977
How to Cite
Sykes, G. F. and Young, P. R. (1977), The effluent analysis of several pyrrone and polyimide precursors during cyclization. J. Appl. Polym. Sci., 21: 2393–2404. doi: 10.1002/app.1977.070210908
- Issue published online: 9 MAR 2003
- Article first published online: 9 MAR 2003
- Manuscript Revised: 22 JUN 1976
- Manuscript Received: 5 OCT 1973
A study was conducted to determine the degree of cyclization occuring in a series of four pyrrone and two polyimide prepolymers. These materials were heated from 25° to 400°C at 2°C/min in a helium atmosphere, and the effluent was sampled at regular intervals by a gas chromatograph/mass spectrometer technique. Quantitative analysis of this effluent indicated that the pyrrone polymers were less than 80% converted under these conditions while the polyimides were essentially fully converted. Significant amounts of carbon dioxide were found to be eliminated as the pyrrone polymers cured. This evolution was attributed to the loss of carbon dioxide from intermediate stages during cure and, in some cases, to the decarboxylation of unreacted groups. Support data obtained on model compounds are also presented.