Bismaleimide and bisazomethine high temperature polymers

✍ Scribed by M. S. Chattha; W. O. Siegl

• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 207 KB
• Volume: 39
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1990.070390717

✦ Synopsis

Conjugated aromatic bisazomethine, resulting from the reaction of terephthaldicarboxaldehyde and aniline, has been found to react with bismaleimidodiphenylmethane to provide polymeric compositions with glass transition temperature higher than 300°C. These two materials form a low viscosity melt at ca. 15OOC and the melt shows only a small viscosity increase when maintained at 120°C over a period of 8 h. Differential scanning calorimetry (DSC) of this composition shows that upon heating above 200"C, it cures rapidly to produce a thermally stable polymer. Thermal mechanical analysis (TMA) of the cured composition does not detect any softening up to 350°C. In the thermal gravimetric analysis (TGA), no weight loss is observed up to 400°C in air and the material leaves a rather large amount of residue (ca. 60%) even up to 600°C. Dynamic mechanical thermal analysis (DMTA) shows that the polymer maintains its high modulus with increasing temperature up to 250°C.