College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China.
College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China.
Mater Sci Eng C Mater Biol Appl. 2020 Apr;109:110567. doi: 10.1016/j.msec.2019.110567. Epub 2019 Dec 28.
Inspired by the adhesion mechanism of natural mussels, polydopamine (PDA) has been widely studied and applied in hydrogels due to its good adhesion to various materials. In this work, a double-layer hydrogel constituted of an adhesive layer and a tough layer was successfully prepared via in-situ polymerization. Adding polystyrene particles into the tough layer could improve the mechanical properties, and the adhesion of various substrates could be achieved with PDA nanoparticles in the adhesive layer. Furthermore, lithium chloride was introduced into the tough layer to endow the bilayer hydrogels with electrical conductivity. Due to the hydrophobic association in the tough layer and hydrogen bond in the adhesive layer, the double-layer hydrogel exhibits self-healing properties. In addition, the NIR light response property of PDA was beneficial to self-healing properties. As a result, it has proved that the prepared bilayer hydrogel has excellent conductivity, toughness (0.18 MPa), adhesion and self-healing properties, which is an ideal flexible wearable strain sensor with high sensitivity and good repeatability, suitable for human motion signal detection.
受天然贻贝粘附机制的启发，由于聚多巴胺（PDA）对各种材料具有良好的粘附性，因此已被广泛研究并应用于水凝胶中。在这项工作中，通过原位聚合成功制备了由粘附层和坚韧层组成的双层水凝胶。在坚韧层中添加聚苯乙烯颗粒可以改善机械性能，并且可以通过粘附层中的 PDA 纳米颗粒实现对各种基底的粘附。此外，将氯化锂引入坚韧层中以使双层水凝胶具有导电性。由于坚韧层中的疏水缔合和粘附层中的氢键，双层水凝胶具有自修复性能。另外，PDA 的近红外光响应特性有利于自修复性能。结果表明，所制备的双层水凝胶具有出色的导电性，韧性（0.18 MPa），粘附性和自修复性能，是一种具有高灵敏度和良好重复性的理想的柔性可穿戴应变传感器，适用于人体运动信号检测。
