高强度、自修复、弹性导电水凝胶纤维的制备及性能研究

Preparation and properties of high strength,self-healing,elastic conductive hydrogel fibers

基于Au-S配位作用,将有机小分子N,N′-双丙烯酰胱胺(BACA)修饰在金颗粒表面并用作多功能复合交联剂,在反应单体、引发剂和催化剂存在下发生原位自由基聚合反应制备Au NPs@PAA纳米复合水凝胶。基于网络结构中动态氢键作用,再协同牵引法策略,使用玻璃棒从上述水凝胶中拉伸出具有可控直径的水凝胶纤维。考察了纳米复合交联剂对纤维聚合物网络结构和机械性能的影响以及纤维的电化学性能。结果表明,纤维显现出均匀、致密的聚合物网络,能够提起比自身重500倍的物体;该纤维在近红外光下显现出高效、快速的焊接行为。通过对纤维表面涂覆银纳米线,协同近红外光辐射,利用Ag-S配位作用将银纳米线(AgNWs)焊接在纤维表面,将纤维应用于穿戴应变传感器,能够实时监测人体的运动状态。

Based on Au-S coordination,N,N'-bis(acryloyl)cystamine(BACA)is modified onto the surface of gold nanoparticles,and used as multi-functional composite crosslinkers to prepare Au NPs/PAA nanocomposite hydrogels through in situ radical polymerization in the presence of monomer,initiator and catalyst.Motivated by the strain-induced strategy,hydrogel fibers with controlled diameters can be easily obtained by using a glass rod to stretch the fiber from the prepared hydrogel.The influences of nanocomposite crosslinking agent on the structure and mechanical properties of fiber polymer network are studied,and the electrochemical properties of fiber are investigated.Results show that the fibers exhibit a uniform and dense polymer network,and is capable of lifting objects up to 500 times their own weight.The fiber shows high efficiency and fast welding behavior under near infrared light.Silver nanowires are welded on the fiber surface by utilizing Ag-S coordination.The fiber with silver nanowires can be applied as wearable strain sensor,which can monitor the movement state of human body in real time.