Han Siyu, Chen Siwen, Hu Zhuang, Liu Yue, Zhang Wanhong, Wang Bai, Hu Jianshe, Yang Liqun
Center for Molecular Science and Engineering, College of Science, Northeastern University, Shenyang 110819, PR China.
Shenyang Fire Science and Technology Research Institute of MEM, Shenyang 110034, PR China; National Engineering Laboratory for Fire and Emergency Rescue, Shenyang 110034, PR China.
J Colloid Interface Sci. 2024 Jan 15;654(Pt B):955-966. doi: 10.1016/j.jcis.2023.10.121. Epub 2023 Oct 24.
Composite elastomers with elasticity, conductivity, and self-healing properties have gained tremendous interest due to the imperative demands in the fields of stretchable electronics and soft robotics. However, the self-healing performance and the amount of filler are contradictory. Herein, a new conductive self-healing composite elastomer is developed by uniformly dispersing EGaIn droplets and Prussian blue nanoparticles (PBNPs) in a bran-new elastomer which cross-linked the linear polymer that obtained by ring-opening polymerization of trimethylene carbonate and 5-methyl-5-carboxytrimethylene carbonate initiated by polyethylene glycol by aluminum chloride. As confirmed by FT-IR and XPS, the cross-linking network of the composite elastomer is composed of hydrogen bonds and coordination bonds sheared between aluminum and carboxyl groups, and the coordination process was revealed by DFT calculations. This elastomer exhibits excellent light-to-heat conversion properties, thermal conductivity (1.207 W/mK), electrical conductivity (202.34 S·m), and good tensile properties that meet application requirements. The good photothermal performance enables the elastomer to self-heal rapidly under NIR irradiation (90.3 %), and accelerate the shape recovery of the elastomer. As a sensor, the elastomer demonstrates good sensitivity, capable of monitoring human movements and recognizing handwriting. This self-healable conductive elastomer has significant potential in the fields of damage-resistant flexible sensors and human-machine interface applications.
由于可拉伸电子学和软机器人领域的迫切需求，具有弹性、导电性和自修复性能的复合弹性体引起了极大的关注。然而，自修复性能和填料用量是相互矛盾的。在此，通过将镓铟合金液滴和普鲁士蓝纳米颗粒（PBNPs）均匀分散在一种全新的弹性体中，制备了一种新型导电自修复复合弹性体，该弹性体是由聚乙二醇引发的碳酸三亚甲酯和5-甲基-5-羧基三亚甲基碳酸酯开环聚合得到的线性聚合物通过氯化铝交联而成。通过傅里叶变换红外光谱（FT-IR）和X射线光电子能谱（XPS）证实，复合弹性体的交联网络由氢键和铝与羧基之间的配位键组成，密度泛函理论（DFT）计算揭示了配位过程。这种弹性体具有优异的光热转换性能、热导率（1.207W/mK）、电导率（202.34S·m）以及满足应用要求的良好拉伸性能。良好的光热性能使弹性体在近红外辐射下能够快速自修复（90.3%），并加速弹性体的形状恢复。作为一种传感器，该弹性体表现出良好的灵敏度，能够监测人体运动并识别笔迹。这种可自修复的导电弹性体在抗损伤柔性传感器和人机界面应用领域具有巨大潜力。
