In a sustainable development context, epoxidized vegetable oils (EVO) have unlimited and promising future prospects as renewable and environmentally friendly feedstock. The only drawback to their use is their low and non-selective reactivity compared to the aromatic epoxides. Properly, a small optimized amount of “true” initiators can overcome this issue and also beneficially serve in properties such as glass transition, modulus, strength, elongation at break, and chemical resistance. This paper presents efforts to understand and identify the initiator’s effect to more accurately predict how to select a good initiator on EVO/dicarboxylic acid systems. A new bio-based reprocessable epoxy resin was prepared from epoxidized linseed oil (ELO) and 2,2′-dithiodibenzoic acid (DTBA). The evolution of the chemical structures and the reactions’ mechanisms have been systematically studied by in situ Fourier transform infrared (FT-IR) and nuclear magnetic resonance (NMR) spectroscopies and differential scanning calorimetry (DSC). A screening of 10 initiators was performed for the ELO/DTBA cross-linking reaction. The influence of the initiator’s structure, basicity, and nucleophilicity was assessed and ranked in terms of the kinetic response including the epoxy–acid reaction rate and the percentage of functional group consumption. An excellent effect achieved by imidazole as an initiator was demonstrated. An attempt has been proposed to corroborate the experimental values with the results of quantum chemistry calculations.

中文翻译：

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化学反应性和引发剂对环氧植物油/二羧酸体系的影响

在可持续发展的背景下，环氧化植物油（EVO）作为可再生和环境友好的原料具有无限的前景。与芳族环氧化物相比，它们使用的唯一缺点是它们的低和非选择性反应性。适当地，少量优化的“真”引发剂可以克服这个问题，并且还可以有益地发挥诸如玻璃化转变，模量，强度，断裂伸长率和耐化学性的特性。本文介绍了努力理解和识别引发剂的作用，以便更准确地预测如何在EVO /二羧酸体系上选择良好的引发剂。从环氧化亚麻籽油（ELO）和2,2'-二硫代二苯甲酸（DTBA）制备了一种新型的生物基可再加工环氧树脂。原位傅立叶变换红外（FT-IR）和核磁共振（NMR）光谱学和差示扫描量热法（DSC）。对ELO / DTBA交联反应进行了10种引发剂的筛选。评估了引发剂的结构，碱性和亲核性的影响，并根据动力学响应进行了排名，包括环氧酸反应速率和官能团消耗百分比。证明了通过咪唑作为引发剂获得的优异效果。已经提出尝试用量子化学计算的结果证实实验值。