Zhang Zhiheng, Corrigan Nathaniel, Boyer Cyrille
Cluster for Advanced Macromolecular Design (CAMD), School of Chemical Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
Cluster for Advanced Macromolecular Design (CAMD) and Australian Centre for NanoMedicine, School of Chemical Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
Angew Chem Int Ed Engl. 2022 Mar 7;61(11):e202114111. doi: 10.1002/anie.202114111. Epub 2021 Dec 14.
Vat photopolymerization-based 3D printing techniques have been widely used to produce high-resolution 3D thermosetting materials. However, the lack of repairability of these thermosets leads to the production of waste. In this study, reversible addition fragmentation chain transfer (RAFT) agents are incorporated into resin formulations to allow visible light (405 nm) mediated 3D printing of materials with self-healing capabilities. The self-healing process is based on the reactivation of RAFT agent embedded in the thermosets under UV light (365 nm), which enables reformation of the polymeric network. The self-healing process can be performed at room temperature without prior deoxygenation. The impact of the type and concentration of RAFT agents in the polymer network on the healing efficiency is explored. Resins containing RAFT agents enable 3D printing of thermosets with self-healing properties, broadening the scope of future applications for polymeric thermosets in various fields.
基于光引发聚合的3D打印技术已被广泛用于生产高分辨率的3D热固性材料。然而，这些热固性材料缺乏可修复性导致了废料的产生。在本研究中，可逆加成-断裂链转移（RAFT）剂被引入树脂配方中，以实现可见光（405 nm）介导的具有自修复能力的材料的3D打印。自修复过程基于热固性材料中嵌入的RAFT剂在紫外光（365 nm）下的重新活化，这使得聚合物网络能够重新形成。自修复过程可以在室温下进行，无需事先脱氧。研究了聚合物网络中RAFT剂的类型和浓度对愈合效率的影响。含有RAFT剂的树脂能够3D打印具有自修复性能的热固性材料，拓宽了聚合物热固性材料在各个领域未来应用的范围。
