Developing aligned discontinuous flax fibre composites: Sustainable matrix selection and repair performance of vitrimers
Developing aligned discontinuous flax fibre composites: Sustainable matrix selection and repair performance of vitrimers
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DOI：
10.1016/j.compositesb.2022.110139
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发表时间：
2022-07-28
影响因子：
13.1
通讯作者：
Eichhorn, Stephen J.
中科院分区：
文献类型：
--
作者：
Kandemir, Ali;Longana, Marco L.;Eichhorn, Stephen J.
纤维增强聚合物复合材料的可持续性对于实现全球可持续发展目标至关重要。天然纤维，特别是亚麻和生物衍生基质是复合材料行业可能的可持续解决方案，因为其成分嵌入式环境影响减少。根据循环经济模式，可持续性也可以通过延迟材料的处理来实现。本工作报告了亚麻纤维与三种潜在的可持续先进基质的界面性能，即，一种结合了热固性材料和热塑性材料的有益特性的玻璃质聚合物，一种完全生物基的热固性材料，以及一种先进的热塑性树脂。每一种选定的基质都具有可回收性、可修复性、可重复使用性或使用可再生资源和减少挥发性有机化合物排放的潜力。微粘结试验用于评估界面剪切强度和临界纤维长度。发现与传统的环氧树脂基质（~ 12 MPa）相比，玻璃化聚物和生物基热固性基质与亚麻纤维具有更高水平的粘附性（分别为~ 20和~ 24 MPa）;高级热塑性树脂（~ 6 MPa）显示出最差的粘附性。选择玻璃体基质作为可持续和可修复的不连续亚麻纤维增强复合材料的候选物。研究了用HiPerDiF法制备的亚麻纤维定向不连续复合材料的力学性能和低温快速修复性能。进行了端到端和单个补丁修复方法：玻璃基复合材料显示出机械强度恢复的潜力（约50 - 70%），这将允许它们在几个生命周期内重复使用，从而实现循环经济。
Sustainability of fibre reinforced polymer composites has become vital for reaching the global sustainable development goals. Natural fibres, particularly flax, and bioderived matrices are possible sustainable solutions for the composites industry, due to the constituents' embedded environmental impact reduction. According to the circular economy paradigm, sustainability can also be achieved by delaying the disposal of materials. This work reports the interfacial properties of flax fibres with three potentially sustainable advanced matrices, i.e., a vitrimer that combines the beneficial properties of both thermosets and thermoplastics, an entirely bio-based thermoset, and an advanced thermoplastic resin. Each of the selected matrices offers the potential for either recyclability, repairability, reusability, or the use of renewable sources and a reduction in the emissions of volatile organic compounds. Microbond tests were used to evaluate the interfacial shear strength and critical fibre length. It was found that the vitrimer and the bio-based thermoset matrices had a higher level of adhesion with flax fibres (-20 and -24 MPa, respectively) compared to a traditional epoxy matrix (-12 MPa); the advanced thermoplastic resin (-6 MPa) shows the poorest adhesion. The vitrimer matrix was selected as a candidate for a sustainable and repairable discontinuous flax fibre reinforced composite. Mechanical and low -temperature rapid repair performance of an aligned discontinuous flax fibre composite, produced using the HiPerDiF method, were investigated. End-to-end and single patch repair methods were performed: vitrimer matrix composites show the potential for a mechanical strength recovery (-%50-70) that would allow them to be reused over several life cycles, enabling a circular economy.