Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Street, Toronto, Ontario, Canada.
Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Street, Toronto, Ontario, Canada; State Key Lab for Strength and Vibration of Mechanical Structures, Department of Engineering Mechanics, Xi'an Jiaotong University, Xi'an, 710049, China.
Carbohydr Polym. 2020 Nov 1;247:116746. doi: 10.1016/j.carbpol.2020.116746. Epub 2020 Jul 13.
In this work, we propose a novel approach to produce a high-strength epoxy nanocomposite using ionic liquids facilitated dispersion of chitin nanowhiskers (CNWs). Samples with 0-3 wt% CNWs and 1 wt% of [Emim][OAc] were fabricated by mixing, casting, and curing. The morphological observations of the ethanol/ionic liquid suspensions by TEM indicated that [Emim][OAc] helped in dispersing the CNWs. The tensile, impact, dynamical mechanical properties, and thermal stability of the composites were further evaluated to access the reinforcing effect of CNWs. Increase of 35 % tensile strength, 175 % toughness and 90 % impact strength were observed upon addition of 2 wt% of CNWs. Thermal stability of the epoxy was not affected by the addition of CNWs. The SEM observations of the composites evidenced that the fracture mechanisms had changed upon CNWs addition. This work shows the advantage of the novel approach using ionic liquids as nanofiller dispersant in fabricating CNWs nanocomposites.
在这项工作中，我们提出了一种使用离子液体促进壳聚糖纳米纤维（CNWs）分散的方法来制备高强度环氧树脂纳米复合材料。通过混合、浇铸和固化制备了含有 0-3wt%CNWs 和 1wt%[Emim][OAc]的样品。TEM 对乙醇/离子液体悬浮液的形态观察表明，[Emim][OAc]有助于分散 CNWs。进一步评估了复合材料的拉伸、冲击、动态力学性能和热稳定性，以评估 CNWs 的增强效果。加入 2wt%的 CNWs 可使拉伸强度提高 35%，韧性提高 175%，冲击强度提高 90%。加入 CNWs 不会影响环氧树脂的热稳定性。复合材料的 SEM 观察表明，加入 CNWs 后，断裂机制发生了变化。这项工作表明了使用离子液体作为纳米填料分散剂制备 CNWs 纳米复合材料的新方法的优势。
