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CURE KINETICS OF A FLEXIBLE AROMATIC DICYANATE WITH SCHIFF BASE STRUCTURE

机译:具有席夫夫基结构的柔性芳族二氰酸酯的固化动力学

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摘要

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(alpha)) of 75.8 kJ/mol and autocatalytic first-order kinetics with rate expression Af(alpha) = 1.96 X 10(5) (1 + 4.39 alpha) (1 - alpha) min(-1). The kinetic feature can be explained by a proposed mechanism consisting of hydroxyl-catalyzed and autocatalytic paths. The lower value of E(alpha) 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. (C) 1995 John Wiley & Sons, Inc. [References: 23]
机译:通过差示扫描量热法(DSC)研究了具有席夫碱结构的柔性芳族二氰酸酯的多环三聚化。动态DSC的研究评估了75.8 kJ / mol的表观活化能(Eα)和自催化一级动力学,速率表达式Afα= 1.96 X 10(5)(1 + 4.39α)(1- alpha)min(-1)。动力学特征可以通过由羟基催化和自催化途径组成的拟议机理来解释。与其他芳族二氰酸酯相比,Eα值较低是由于固有亚胺(-CH = N)结构的吸电子键。动力学特征受相应样品中残留杂质(例如苯酚或吸收的水)含量的影响。 (C)1995 John Wiley&Sons,Inc. [参考:23]

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