Eutectic hardener from food-based chemicals to obtain fully bio-based and durable thermosets,Green Chemistry

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Eutectic hardener from food-based chemicals to obtain fully bio-based and durable thermosets
Green Chemistry ( IF 9.3 ) Pub Date : 2020-03-06 , DOI: 10.1039/d0gc00311e
Jonathan Tellers _{1,

2,

3,

4,

5} , Philippe Willems _{6,

7,

8} , Bôke Tjeerdsma _{6,

7,

8} , Nathanael Guigo _{1,

2,

3,

4,

5} , Nicolas Sbirrazzuoli _{1,

2,

3,

4,

5}

Affiliation

This paper presents a facile strategy to activate citric acid (CA) for room temperature curing. The high melting point of CA is reduced by preparing a eutectic mixture of CA and ethyl lactate (EL). By using CA and EL in the molar ratio of 1 : 1, the melting point of CA can be reduced from 200 °C to −50 °C. This eutectic mixture is then used to cure epoxidized linseed oil (ELO) at room temperature and higher temperatures. Room temperature curing was demonstrated by studying the evolution of the storage and loss modulus as a function of time, as well as by monitoring the changes in the glass transition temperature (T_g) with time. By isothermal curing experiments, the activation energy was determined to be 73 kJ mol⁻¹. A comparison between the performance of the samples prepared at room temperature and that of samples prepared at higher temperatures was made, and it was found that full curing cannot be achieved at lower temperatures. By using only bio-based molecules, a fully bio-based thermoset with applicability in everyday life was obtained.

中文翻译：

从食品类化学品获得共晶硬化剂，从而获得完全基于生物的耐用热固性材料

本文提出了一种用于室温固化的活化柠檬酸（CA）的简便策略。通过制备CA和乳酸乙酯（EL）的低共熔混合物，可以降低CA的高熔点。通过以1：1的摩尔比使用CA和EL，可以将CA的熔点从200℃降低至-50℃。然后将该共晶混合物用于在室温和更高温度下固化环氧化亚麻籽油（ELO）。通过研究储能和损耗模量随时间的变化以及监测玻璃化转变温度（T _g）随时间的变化，证明了室温固化。通过等温固化实验，确定活化能为73 kJ mol ^-1。比较了在室温下制备的样品的性能和在较高温度下制备的样品的性能，发现在较低温度下不能实现完全固化。通过仅使用基于生物的分子，获得了在日常生活中具有适用性的完全基于生物的热固性塑料。

更新日期：2020-03-06

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