Semi-convertible Hydrogel Enabled Photoresponsive Lubrication
Semi-convertible Hydrogel Enabled Photoresponsive Lubrication
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DOI：
10.1016/j.matt.2020.11.018
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发表时间：
2021-02-03
期刊：
影响因子：
18.9
通讯作者：
Wang, Shutao
中科院分区：
文献类型：
--
作者：
Wang, Jian;Zhang, Xuewei;Wang, Shutao
通过将α-环糊精/聚乙二醇（α-CD/PEG）和竞争性客体1-[p-（苯基偶氮）苄基]溴化吡啶（AzoPB）的响应性超分子体系整合在聚乙烯醇（PVA）和聚丙烯酰胺（PAAm）骨架内，证明了具有可逆光响应性超分子润滑能力的半可转化水凝胶。紫外光和可见光照射后，alpha-CD/PEG超分子网络与AzoPB之间的竞争性主客体相互作用使水凝胶表面的溶胶层出现和消失，而PVA和PAAm始终保持骨架。这种半转化过程实现了可逆的光响应润滑能力和可变的韧性。我们设想，这一发现将为制造远远超出润滑范围的新型智能设备提供一种可能的方法，从而催生一个整合超分子化学、水凝胶和表面科学的跨学科材料科学的新兴分支。
A semi-convertible hydrogel with reversible photo responsive supra-molecular lubricating ability is demonstrated by integrating a responsive supra molecular system of alpha-cyclodextrins/polyethylene glycol (alpha-CD/PEG) and competitive guest 1-[p-(phenylazo) benzyl] pyridinium bromide (AzoPB) within a poly(vinyl alcohol) (PVA) and polyacrylamide (PAAm) framework. The competitive host-guest interaction between alpha-CD/PEG supramolecular network and AzoPB after UV and visible-light irradiation enables the appearance and disappearance of the sol-state layer on the hydrogel surface while the PVA and PAAm consistently keeps the framework. This semi convertible process realizes the reversible photo responsive lubricating ability and variable toughness. We envision that this finding will offer a possible way for fabricating novel smart devices far beyond lubrication, leading to an emerging branch of interdisciplinary materials science that integrates supramolecular chemistry, hydrogel, and surface science.