Affiliation:
1. School of Materials Science and Engineering South China University of Technology Guangzhou 510640 China
2. Guangdong Provincial Key Laboratory of Novel Polyamide 6 Functional Fiber Materials Research and Application Jiangmen 529100 China
3. School of Physics and Materials Science Nanchang University Nanchang 330031 China
Abstract
AbstractUnderwater adhesion of hydrogels is essential for their applications in liquid environment. However, green raw materials, facile preparation process and multiple environmental adaptability are still issues that need to be improved. Inspired by the protein‐based underwater bio‐adhesion phenomena in nature, an effective stepwise immersion method is developed without any polymerization to prepare a green underwater adhesive hydrogel by combining gelatin and tannic acid (TA), two common materials from nature yet difficult to obtain their homogenous compound. By facile treatments in urea solution or heating, the hydrogels can realize stable immediate adhesion on various substrates and in different liquids in addition to water with a wide range of adjustable adhesion strength of 100–103 kPa. The evolution of the hydrogel network structure and the adhesion mechanism are systematically studied. Furthermore, several typical portable products based on the adhesive hydrogels are demonstrated to show the commercialization possibility. This work presented a novel, facile, and distinctive strategy for designing environmentally friendly, multiple adaptive adhesives.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China