Department of Mechanical Engineering, University of Alberta, 05-293 Donadeo Innovation Centre for Engineering 9211 116 Street NW, Edmonton, AB T6G 1H9, Canada.
Department of Agricultural, Food and Nutritional Science, University of Alberta, 360C South Academic Building, Edmonton, AB T6G 2G7, Canada.
ACS Appl Mater Interfaces. 2020 Nov 18;12(46):51927-51939. doi: 10.1021/acsami.0c14220. Epub 2020 Nov 6.
A novel self-healable, fully reprocessable, and inkjet three-dimensional (3D) printable partially biobased elastomer is reported in this work. A long-chain unsaturated diacrylate monomer was first synthesized from canola oil and then cross-linked with a partially oxidized silicon-based copolymer containing free thiol groups and disulfide bonds. The elastomer is fabricated through inkjet 3D printing utilizing the photoinitiated thiol-ene click chemistry and reprocessed by compression molding exploiting the dynamic nature of disulfide bond. Self-healing is enabled by phosphine-catalyzed disulfide metathesis. The elastomer displayed a tensile strength of ∼52 kPa, a breaking strain of ∼24, and ∼86% healing efficiency at 80 °C temperature after 8 h. Moreover, the elastomer showed excellent thermal stability, and the highest thermal degradation temperature was recorded to be ∼524 °C. After reprocessing through compression molding, the elastomer fully recovered its mechanical and thermal properties. These properties of the elastomer yield an ecofriendly alternative of fossil fuel-based elastomers that can find broad applications in soft robotics, flexible wearable devices, strain sensors, health care, and next-generation energy-harvesting and -storage devices.
本工作报道了一种新型自修复、完全可再加工、喷墨三维（3D）打印的部分生物基弹性体。首先从菜籽油合成长链不饱和二丙烯酸酯单体，然后与含有游离巯基和二硫键的部分氧化硅基共聚物交联。利用光引发的硫醇-烯点击化学反应通过喷墨 3D 打印制造弹性体，并利用二硫键的动态性质通过压缩成型进行再加工。通过膦催化的二硫键交换反应实现自修复。弹性体在 80°C 温度下经过 8 小时后，表现出约 52 kPa 的拉伸强度、约 24 的断裂应变和约 86%的愈合效率。此外，弹性体表现出优异的热稳定性，最高热降解温度记录为约 524°C。通过压缩成型再加工后，弹性体完全恢复了其机械和热性能。这些弹性体的性能为基于化石燃料的弹性体提供了一种环保替代品，可广泛应用于软机器人、柔性可穿戴设备、应变传感器、医疗保健以及下一代能量收集和存储设备。
