A new method for predicting the thermal oxidation of thermoset matrices: Application to an amine crosslinked epoxy

详细信息    查看全文

• 作者：Colin ; X. ; Marais ; C. ; Verdu ; J.
• 关键词：Amine crosslinked epoxy ; Thermal oxidation ; Kinetics ; Diffusion control ; Oxidised layer
• 刊名：Polymer Testing
• 出版年：2001
• 出版时间：2001
• 年：2001
• 卷：20
• 期：7
• 页码：795-803
• 全文大小：216 K

文摘

The thermal oxidation of an aromatic amine crosslinked epoxy network has been studied in air below its glass transition temperature by optical microscopy, IR spectroscopy and gravimetry. The superficial oxidised layer has a thickness of 147 μm at 150°C, 94 μm at 180°C and 62 μm at 200°C. A method is proposed to predict the oxidised thickness. It is based on a differential equation in which O₂ diffusion and its chemical consumption rate, r(C), are coupled, C being the O₂ concentration. The knowledge of equation parameters requires two sets of experiments: permeation tests to estimate both O₂ diffusivity and solubility into the polymer and also, gravimetric measurements on thin polymer films oxidised at various O₂ partial pressures to determine the kinetic parameters of r(C). Predictions are in good agreement with experimental results for all temperatures under consideration.