Interplay of curing and thermal degradation in epoxy resins cured with amino acids: Influence of the maximum curing temperature on the network structure, crystal morphology and mechanical properties,Journal of Applied Polymer Science

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Interplay of curing and thermal degradation in epoxy resins cured with amino acids: Influence of the maximum curing temperature on the network structure, crystal morphology and mechanical properties
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2023-09-18 , DOI: 10.1002/app.54655
Florian Rothenhäusler ₁ , Holger Ruckdaeschel ₁

Affiliation

Bio-based alternatives for epoxy resin curing agents are a necessity for fiber reinforced polymer composites to become more sustainable. Here, the precise knowledge about the optimal curing cycle and its influence on the thermoset's mechanical properties are imperative. Therefore, the influence of the maximum curing temperature on the network structure, crystal morphology and mechanical properties of diglycidyl ether of bisphenol A (DGEBA) cured with l-arginine was investigated with the goal to derive structure–property relationships and a favorable curing cycle. The maximum curing temperature used can be categorized into two regimes: first, the temperature range in which the thermoset reaches complete curing and second, the temperature regime in which the thermoset is fully cured and the thermal degradation starts to diminish its mechanical properties. An optimized curing regimen for achieving high flexural strength accompanied by adequate fracture toughness entails subjecting the material to a curing cycle comprising a duration of 1 h at a temperature of 150°C, followed by an additional 2 h at a temperature of 170°C. This study represents a pioneering effort in optimizing the curing process of amino acid-cured epoxy resin, specifically focusing on achieving the most favorable mechanical properties as a result.

中文翻译：

氨基酸固化环氧树脂中固化和热降解的相互作用：最高固化温度对网络结构、晶体形态和机械性能的影响

环氧树脂固化剂的生物基替代品是纤维增强聚合物复合材料变得更加可持续的必要条件。在这里，必须准确了解最佳固化周期及其对热固性材料机械性能的影响。因此，研究了最高固化温度对L-精氨酸固化双酚A二缩水甘油醚（DGEBA）的网络结构、晶体形貌和机械性能的影响，旨在得出结构-性能关系和有利的固化周期。使用的最高固化温度可分为两个范围：第一，热固性材料达到完全固化的温度范围；第二，热固性材料完全固化且热降解开始降低其机械性能的温度范围。为了实现高弯曲强度和足够的断裂韧性，优化的固化方案需要使材料经历一个固化周期，其中包括在 150°C 的温度下持续 1 小时，然后在 170°C 的温度下再持续 2 小时。这项研究代表了优化氨基酸固化环氧树脂固化过程的开创性努力，特别注重最终实现最有利的机械性能。

更新日期：2023-09-18

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