Green and sustainable polymeric-matrix composites have recently attracted much scientific and industrial attention. Naturally derived materials (e.g., chitin and cellulose) have been extensively studied due to their abundant availability and environmental appeal. Vitrimer, combining the properties of traditional thermosets and thermoplastics, has emerged as an attractive alternative for composite matrix. Here, two hot-debated materials were combined to fabricate the layered chitin–vitrimer composite with enhanced modulus, reprocessability, and smart actuator function. We utilized an ionic liquid assisted method to prepare the chitin films with ordered microstructures. The chitin–vitrimer composites exhibited a unique two-stage stress–strain behavior, and their failure behaviors were discussed from the angle of fracture mechanics. The composites showed weldability and recyclability under the hot-pressing treatment. In addition, the welded bilayer structure demonstrated a smart actuator function on the basis of the shape memory effect. Furthermore, the simple but efficient fabrication strategy could provide an avenue to apply dynamic chemistries and natural materials in the green and sustainable industry.

中文翻译：

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具有增强的模量，可再加工性和智能执行器功能的绿色，可持续的分层甲壳素-Vitrimer复合材料

绿色和可持续的聚合物基复合材料最近吸引了许多科学和工业关注。天然来源的材料（例如，几丁质和纤维素）由于其丰富的可用性和环境吸引力而得到了广泛的研究。结合了传统热固性塑料和热塑性塑料的特性的Vitrimer已经成为复合基质的有吸引力的替代品。在这里，两种热辩论材料结合在一起，以制造具有增强模量，可再加工性和智能执行器功能的几丁质-玻璃纤维复合材料。我们利用离子液体辅助方法来制备具有有序微结构的几丁质膜。几丁质-玻璃纤维复合材料表现出独特的两阶段应力-应变行为，并从断裂力学的角度讨论了它们的破坏行为。该复合材料在热压处理下显示出可焊接性和可回收性。另外，基于形状记忆效应，焊接的双层结构表现出智能的致动器功能。此外，简单而有效的制造策略可以为绿色和可持续工业中应用动态化学物质和天然材料提供一条途径。