Global kinetics of thermal degradation of flame-retarded epoxy resin formulations
Global kinetics of thermal degradation of flame-retarded epoxy resin formulations
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DOI：
10.1016/j.polymdegradstab.2007.07.011
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发表时间：
2007-10-01
影响因子：
5.9
通讯作者：
Staggs, John E. J.
中科院分区：
文献类型：
--
作者：
Kandare, Everson;Kandola, Baljinder K.;Staggs, John E. J.
提出了一种描述含阻燃剂（FR）的环氧树脂配方的质量损失曲线的预测数学模型。质量损失是由于组成成分的热降解造成的，并且可以通过具有常微分方程形式的给定热动力学常数集的通用动力学方案来描述。这项工作的范围是通过使用热重分析来确定已知阻燃环氧树脂组合物的热降解动力学参数，并使用获得的数据来预测其他配方的降解曲线。通过求解常微分方程的耦合系统，然后考虑混合物中各组分的质量比，使用鲍威尔最小化找到最佳阿伦尼乌斯参数，从而预测 Visil 和膨胀型环氧树脂配方的质量损失曲线。假设降解机制不变，计算出的一种配方（85% 树脂 - 15% 阻燃添加剂）的动力学常数可用于预测其他配方（80% 树脂 - 20% 阻燃添加剂和 90% 树脂 - 10% 阻燃添加剂）的质量损失曲线。将预测的热降解曲线与使用标准实验室设备获得的实验数据进行比较，以验证所提出的机制。获得的动力学参数充分描述了所研究的复合材料的质量损失历史，即使使用了极其简化的动力学方案。 (C) 2007 Elsevier Ltd. 保留所有权利。
A predictive mathematical model to describe mass loss profiles of flame-retardant (FR) containing epoxy resin formulations is proposed. Mass loss is due to thermal degradation of the constituent components and can be described by a generic kinetic scheme with a given set of thermokinetic constants in the form of ordinary differential equations. The scope of this work is to determine the kinetic parameters of the thermal degradation of a known flame-retarded epoxy resin composition by using thermogravimetric analysis and using the acquired data to predict the degradation profiles for other formulations. The mass loss profiles of Visil and intumescent epoxy resin containing formulations were predicted by solving coupled systems of ordinary differential equations and then using Powell minimisation to find the optimal Arrhenius parameters, taking into account the mass ratio of the components in the mixture. The calculated kinetic constants for one formulation (85% resin-15% FR additives) are used to predict the mass loss profiles for other formulations (80% resin-20% FR additives and 90% resin-10% FR additives) with the assumption that the degradation mechanism does not change. The predicted thermal degradation profiles are compared with experimental data acquired using standard laboratory equipment in order to validate the proposed mechanisms. The kinetic parameters obtained adequately describe mass loss history of composite materials studied, even when extremely simplified kinetic schemes have been used. (C) 2007 Elsevier Ltd. All rights reserved.