Abstract Epoxy resins are ubiquitously encountered in industrial applications as in adhesives and composites. The properties of epoxy-amine networks are directly impacted by the presence of metal (hydr-oxidized) surfaces, leading to a modification of their glass transition temperature Tg. We propose here an innovative experimental approach, investigating the interaction of DETA amine and DGEBA epoxy with Al and Cu powder substrates (partially (hydr)oxidized). We explored for the first time the formation of the amine-metal interphase by in situ mixing calorimetry to evaluate the energetics of interaction. While DGEBA interacted only slightly with Al-based surface, the reaction with DETA was associated with a high exothermic enthalpy of reaction. The enhancing role of surface hydroxylation was also evidenced by comparing boehmited Al to a simply oxidized counterpart. An even larger exothermic effect was measured with copper, which was related to the high chelating power of Cu compared to Al. The possible underlying mechanism of amine-metal interphase formation was discussed with a generalized schematic.

中文翻译：

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环氧体系中胺-金属反应的直接证据：界面形成的原位量热法研究

摘要 环氧树脂在工业应用中无处不在，如粘合剂和复合材料。环氧-胺网络的性质直接受到金属（氢氧化）表面的影响，导致其玻璃化转变温度 Tg 发生变化。我们在这里提出了一种创新的实验方法，研究 DETA 胺和 DGEBA 环氧树脂与铝和铜粉末基材（部分（氢）氧化）的相互作用。我们首次通过原位混合量热法探索了胺-金属界面的形成，以评估相互作用的能量学。虽然 DGEBA 与铝基表面的相互作用很小，但与 DETA 的反应与反应的高放热焓有关。通过将勃姆石铝与简单氧化的对应物进行比较，也证明了表面羟基化的增强作用。用铜测得的放热效应甚至更大，这与与铝相比，铜的高螯合能力有关。用广义示意图讨论了胺-金属界面形成的可能潜在机制。