Spectroscopic study of the chemical conversions of aromatic polyimides containing double and triple carbon-carbon bonds

Infrared spectroscopy and high resolution NMR in a solid body have been used to study the opening of the double and triple bonds contained in the diamine fragments of some aromatic polyimides at 20–400°C. The consumption of the double and triple bonds on heating begins simultaneously and occurs synchronously by more than 80–95%. A small number of triple bonds remains even at 400°C.