Cure kinetics of a flexible aromatic dicyanate with schiff base structure

✍ Scribed by Ying-Hung Wang; Yeng-Long Hong; Jin-Long Hong

• Book ID: 102737609
• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 512 KB
• Volume: 58
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1995.070580922

✦ Synopsis

Polycyclotrimerization of a flexible aromatic dicyanate with a Schiff base structure was studied by means of differential scanning calorimetry (DSC). The study on dynamic DSC evaluated an apparent activation energy (En) of 75.8 kJ/mol and autocatalytic first-order kinetics with rate expression A f ( a ) = 1.96 X lo5 (1 + 4.39 a) (1 -a) min-'. The kinetic feature can be explained by a proposed mechanism consisting of hydroxyl-catalyzed and autocatalytic paths. The lower value of En compared with other aromatic dicyanates is due to the electron-withdrawing linkage of the inherent imine (-CH=N) structure. The kinetic feature is affected by the content of the residual impurities (e.g., phenols or absorbed water) in the corresponding sample.