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Cure kinetics of a flexible aromatic dicyanate with schiff base structure
Author(s) -
Wang YingHung,
Hong YengLong,
Hong JinLong
Publication year - 1995
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1995.070580922
Subject(s) - autocatalysis , schiff base , differential scanning calorimetry , kinetics , chemistry , activation energy , polymer chemistry , imine , organic chemistry , catalysis , thermodynamics , physics , quantum mechanics
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 ( E a ) of 75.8 kJ/mol and autocatalytic first ‐order kinetics with rate expression Af (α) = 1.96 X 10 5 (1 + 4.39 α) (1 ‐ α) min −1 . The kinetic feature can be explained by a proposed mechanism consisting of hydroxyl‐catalyzed and autocatalytic paths. The lower value of E a compared with other aromatic dicyanates is due to the electron‐withdrawing linkage of the inherent imine (—CHN) structure. The kinetic feature is affected by the content of the residual impurities (e.g., phenols or absorbed water) in the corresponding sample. © 1995 John Wiley & Sons, Inc.