Sustainable Epoxy Vitrimers from Epoxidized Soybean Oil and Vanillin,ACS Sustainable Chemistry & Engineering

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Sustainable Epoxy Vitrimers from Epoxidized Soybean Oil and Vanillin
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-09-08 , DOI: 10.1021/acssuschemeng.0c05727
Xiao-Li Zhao ₁ , Yu-Yao Liu ₁ , Yunxuan Weng ₂ , Yi-Dong Li ₁ , Jian-Bing Zeng _{1,

2}

Affiliation

Epoxidized soybean oil (ESO)-derived epoxy thermosets are usually limited by their poor mechanical properties and non-reprocessability. Herein, we report sustainable epoxy vitrimers synthesized facilely by curing ESO with vanillin-derived Schiff base (VSB) dynamic hardener with 1,2-dimethylimidazole as an accelerator. The phenolic hydroxyl of VSB showed high reactivity toward the epoxy group of ESO with a curing activation energy of 108.9 kJ·mol^–1. The network rigidness and cross-link density of the epoxy vitrimers are adjustable by simply changing the feed ratio of flexible ESO and rigid VSB, which enables us to tailor the mechanical properties of the vitrimers easily over a wide range from soft to tough and hard. The dynamic Schiff base bonds provide the epoxy vitrimer with excellent reprocessability, weldability, reconfigurability, and programmability, which facilitates the recycling and processing of the cured epoxy materials. With tunable mechanical properties, reprocessability, and multifunctionality, the ESO-derived epoxy vitrimers are of great potential as alternatives to traditional epoxy thermosets.

中文翻译：

环氧大豆油和香兰素的可持续环氧滴定剂

环氧大豆油（ESO）衍生的环氧热固性树脂通常受其较差的机械性能和不可再加工性的限制。在本文中，我们报告了通过用香草醛衍生的席夫碱（VSB）动态硬化剂与1,2-二甲基咪唑作为促进剂固化ESO轻松合成的可持续环氧三聚体。VSB的酚羟基对ESO的环氧基具有高反应活性，固化活化能为108.9 kJ·mol ^–1。只需简单地改变柔性ESO和刚性VSB的进料比，就可以调节环氧微晶玻璃的网络刚度和交联密度，这使我们能够轻松地在软，硬和硬的大范围内调整微晶玻璃的机械性能。动态席夫碱键为环氧三聚体提供了出色的可再加工性，可焊接性，可重构性和可编程性，从而促进了固化后的环氧材料的回收和加工。凭借可调节的机械性能，可再加工性和多功能性，源自ESO的环氧微晶玻璃具有巨大的潜力，可以替代传统的环氧热固性树脂。

更新日期：2020-10-05

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