Supramolecular Hydrogel Formation Based on Tannic Acid

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• 作者：Hailong Fan ; Le Wang ; Xunda Feng ; Yazhong Bu ; Decheng WuZhaoxia Jin
• 刊名：Macromolecules
• 出版年：2017
• 出版时间：January 24, 2017
• 年：2017
• 卷：50
• 期：2
• 页码：666-676
• 全文大小：803K
• ISSN：1520-5835

文摘

The development of facile and versatile strategies with low-cost for hydrogel construction is of tremendous scientific interest. Herein, we demonstrate that naturally derived, cost-effective tannic acid (TA) can be an efficient gelation binder for the hydrogel formation with a series of commercially available water-soluble polymers. With a five-polyphenol-arm structure, TA molecules are able to grasp polymer chains through either hydrogen or ionic bonds and cross-link them together by coordinate bonds in the presence of Fe(III) ions. These two interactions can be elegantly balanced by tuning the weight ratios of polymer/TA and TA/Fe³⁺, which is the key point for the construction of supramolecular hydrogels. The supramolecular hydrogels exhibit multiple functionalities including mechanical tenability, rapid self-healing, pH-stimuli responsiveness, and free radical scavenging abilities. TA as a dynamic and versatile catechol group modifier provides a simple path to the construction of multifunctional hydrogels, which shows obvious advantages such as easy and green processing, low cost, and large-scale preparation.