环氧胺组合物的固化流变动力学

IF 3.1 2区化学 Q2 CHEMISTRY, ANALYTICAL Thermochimica Acta Pub Date : 2024-07-17 DOI:10.1016/j.tca.2024.179825

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引用次数: 0

摘要

文章研究了以双酚 A 二缩水甘油醚为基础的环氧树脂与胺固化剂 Aramin（脂肪族胺和芳香族胺的混合物）的固化过程。研究发现，在 20、40 和 60 °C 下固化时会出现微凝胶现象。粘度系数 kη 分别上升了 2、3 和 4 倍。考虑了使用二阶方程、Kamal 催化方程、自加速方程和自抑制方程来描述固化过程的可能性。结果表明，没有任何一个方程能高度准确地描述整个过程。已经找到了能够充分描述该过程不同阶段的方程。确定了开始微凝胶化、凝胶化以及从动力学机制过渡到扩散控制机制的条件（时间和转化程度）。

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Curing rheokinetics of epoxy-amine composition

The article examines the curing of epoxy resin, based on diglycidyl ether Bisphenol-A, with the amine hardener Aramin (a mixture of aliphatic and aromatic amines). It was found that curing at 20, 40 and 60 °C is accompanied by microgelation. Coefficients of viscosity increase $k_{η}$ rise by 2, 3 and 4 times respectively. The possibility of using second order equation, Kamal catalytic equation, auto-acceleration and auto-inhibition equations and describing the curing process was considered. It was shown that no one of the equations describes the entire process with a high degree of accuracy. Equations, which could adequately describe distinct stages of the process, have been found. The conditions (time and degree of conversion) for the onset of microgelation, gelation and transition from a kinetic to a diffusion-controlled mechanism were established.

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来源期刊

Thermochimica Acta 化学-分析化学

CiteScore

6.50

自引率

8.60%

发文量

210

审稿时长

40 days

期刊介绍： Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes