Underwater adhesion anti-swelling hydrogel and flexible strain sensor

Abstract

The underwater adhesion anti-swelling hydrogel is prepared by the following steps: stirring alkyl acrylate, a surfactant and sodium chloride in water until the mixture is clear to obtain a precursor A, dropwise adding a ferric trichloride solution into a mixed solution of dimethylaminoethyl methacrylate, 2-hydroxyethyl acrylate and a chemical cross-linking agent, and stirring to obtain a precursor B; and mixing the precursor A and the precursor B, which are subjected to bubble removal, under the action of an initiator, and adopting a one-step gel method to obtain the hydrogel capable of being adhered underwater and resisting swelling. According to the preparation method disclosed by the invention, a molecular bridge relation is established between the gel and a target interface underwater through cooperation of electrostatic interaction, metal coordination and hydrophobic association, adhesion is realized, and the surface water repellency of the gel is improved by introducing a hydrophobic group, so that the underwater stability of the gel is improved. The invention further discloses an underwater adhesion anti-swelling hydrogel flexible strain sensor, and the underwater adhesion anti-swelling hydrogel flexible strain sensor is a flexible strain sensor formed by installing the underwater adhesion anti-swelling hydrogel on the electrodes.

Description

technical field [0001] The invention relates to a preparation method of an underwater adhering and anti-swelling hydrogel, a flexible strain sensor prepared based on the underwater adhering and anti-swelling hydrogel, and the The application in the detection of tensile strain and external force frequency, specifically in the preparation of underwater real-time health monitoring equipment, underwater flexible robots, electronic skin, tensile strain detection equipment and many other applications. Background technique [0002] In recent years, flexible electronic devices have emerged in the fields of information, energy, medical care, and national defense due to their unique ductility, high-efficiency, and low-cost manufacturing processes. In order to better fit the skin and improve comfort during use, inspired by human skin, electronic skins that simulate various functions of the skin have developed rapidly in recent years. Hydrogel is a three-dimensional network structure g...

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