Biobased epoxy vitrimer from epoxidized soybean oil for reprocessable and recyclable carbon fiber reinforced composite
Biobased epoxy vitrimer from epoxidized soybean oil for reprocessable and recyclable carbon fiber reinforced composite
复制标题
来自环氧化大豆油的生物基环氧玻璃体用于可再加工和可回收的碳纤维增强复合材料
DOI：
10.1016/j.coco.2020.100445
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发表时间：
2020-12-01
影响因子：
8
通讯作者：
Zeng, Jian-Bing
中科院分区：
文献类型：
--
作者：
Liu, Yu-Yao;He, Jia;Zeng, Jian-Bing
传统的碳纤维增强环氧树脂热固性复合材料由于热固性树脂的永久交联结构，不可再生，无法再加工或回收，造成资源危机、环境污染和资源浪费。以环氧大豆油、香草醛和对氨基苯酚为原料合成了一种具有动态席夫碱基团的生物基环氧硫酸酯。生物基环氧玻璃化物显示出优异的延展性、可回收性和力学性能，使其适合作为制备碳纤维（CF）增强复合材料的基体。CF织物增强的ESO-VA复合材料表现出比ESO-VA更优越的上级机械强度和模量。该复合材料可以通过不同的方法回收，由于动态席夫碱单元。在酸性条件下，由于席夫碱键的解离，ESO-VA的网络结构被破坏，从而使有价值的CF织物在不改变结构和性能的情况下得以回收。破碎后的复合材料可以通过传统的加工技术如模压成型热回收为短碳纤维填充复合材料制品。我们相信，这项研究提供了一个策略，设计可回收的碳纤维增强生物基环氧树脂复合材料。
Traditional carbon fiber reinforced epoxy thermosets composites are nonrenewable and cannot be reprocessed or recycled due to the permanent crosslinked structure of the thermosets, causing resource crisis, environmental pollution, and resource waste. Herein, a biobased epoxy vitrimer (ESO-VA) with dynamic Schiff base groups was synthesized from epoxidized soybean oil (ESO), vanillin, and 4-aminophenol. The biobased epoxy vitrimer showed excellent malleability, recyclability, and mechanical properties, making it suitable as matrix to fabricate carbon fiber (CF) reinforced composites. The CF fabric reinforced ESO-VA composites showed superior mechanical strength and modulus over ESO-VA. The composites can be recycled through different approaches, owning to the dynamic Schiff base unit. The valued CF fabric can be recycled without changing structure and properties by deconstruction network structure of ESO-VA as a result of dissociation of Schiff base bond under acidic condition. The composites after crushing could be recycled thermally into short carbon fiber filled composite products through traditional processing techniques such as compression molding. We believe that this study provides a strategy to design recyclable carbon fiber reinforced biobased epoxy composites.