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Examining the early stages of thermal oxidative degradation in epoxy-amine resins
Polymer Degradation and Stability ( IF 5.9 ) Pub Date : 2020-03-18 , DOI: 10.1016/j.polymdegradstab.2020.109147
Suzanne Morsch , Yanwen Liu , S.B. Lyon , S.R. Gibbon , Benjamin Gabriele , Mikhail Malanin , Klaus-Jochen Eichhorn

Epoxy-amine resins continue to find widespread use as the binders in protective and decorative organic coatings, as the matrix in composite materials, and as adhesives. In service, exposure to the environment ultimately results in oxidative deterioration of these materials, limiting the performance lifetime. Defining this auto-oxidation process is therefore a key challenge in developing more durable high-performance materials. In this study, we investigate oxidative degradation of a model resin based on diglycidyl ether of bisphenol-A (DGEBA) and an aliphatic amine hardener, triethylenetetraamine (TETA). Using infrared spectroscopy, we find that prior to the expected detection of formate groups (corresponding to the well-known radical oxidation mechanism of DGEBA), a band at 1658 cm−1 forms, associated with amine cross-linker oxidation. Infrared microspectroscopy, in-situ heated ATR-infrared, Raman spectroscopy and AFM-IR techniques are thus employed to investigate the early stages of resin oxidation and demonstrate strong parallels between the initial stages of cured resin degradation and the auto-oxidation of TETA cross-linker molecules.



中文翻译:

检查环氧胺树脂中热氧化降解的早期阶段

环氧胺树脂继续在保护性和装饰性有机涂料中用作粘合剂,在复合材料中用作基质以及用作粘合剂。在使用中,暴露于环境中最终会导致这些材料的氧化变质,从而限制使用寿命。因此,定义这种自氧化过程是开发更耐用的高性能材料的关键挑战。在这项研究中,我们研究了基于双酚A的二缩水甘油醚(DGEBA)和脂肪族胺硬化剂三亚乙基四胺(TETA)的模型树脂的氧化降解。使用红外光谱法,我们发现在预期检测甲酸酯基团(对应于DGEBA的自由基氧化机理)之前,在1658 cm -1处有一个谱带形式,与胺交联剂氧化有关。因此,采用了红外显微技术,原位加热的ATR红外技术,拉曼光谱和AFM-IR技术研究了树脂氧化的早期阶段,并证明了固化树脂降解的初始阶段与TETA交叉自氧化之间的强相似性接头分子

更新日期:2020-03-19
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