阅读说明：本技术 一种适用于溶剂环境下石墨烯导电水凝胶传感器制备方法 (Preparation method of graphene conductive hydrogel sensor suitable for solvent environment ) 是由 高光辉 刘鑫 张钦 于 2019-09-17 设计创作，主要内容包括：本发明的一种适用于溶剂环境下石墨烯复合导电水凝胶传感器的制备方法,解决了水凝胶无法在溶剂环境下的稳定传感的难题。本发明将石墨烯、丙烯酸、丙烯酸-2-甲氧乙基脂、过硫酸钾溶解于水和二甲基亚砜的混合溶液中,经加热引发,进行自由基聚合反应,最终制得石墨烯复合导电水凝胶。本发明制备的石墨烯复合导电水凝胶在水、乙醇、氯仿、正己烷、十二烷等溶剂环境下可以对拉伸应力、压缩应力和弯曲应力进行精确监测和感知。本发明实现了凝胶软材料在水下以及各种溶剂环境下对应力变化的精准感知,扩宽了导电水凝胶的应用范围,有望应用于凝胶电解质、可穿戴设备、软体机器人以及适用于各种溶剂环境下的高端柔性电子产品等领域。(The preparation method of the graphene composite conductive hydrogel sensor suitable for the solvent environment solves the problem that hydrogel cannot stably sense in the solvent environment. According to the invention, graphene, acrylic acid-2-methoxyethyl ester and potassium persulfate are dissolved in a mixed solution of water and dimethyl sulfoxide, and are heated to initiate free radical polymerization reaction, so that the graphene composite conductive hydrogel is finally prepared. The graphene composite conductive hydrogel prepared by the invention can accurately monitor and sense tensile stress, compressive stress and bending stress in solvent environments such as water, ethanol, chloroform, normal hexane and dodecane. The invention realizes the accurate perception of the soft gel material to the stress change under water and various solvent environments, widens the application range of the conductive hydrogel, and is hopeful to be applied to the fields of gel electrolyte, wearable equipment, soft robots, high-end flexible electronic products and the like under various solvent environments.)

1. A preparation method of a graphene composite conductive hydrogel sensor suitable for a solvent environment is characterized by comprising the following steps and conditions:

Uniformly dispersing graphene in a mixed solvent of deionized water and dimethyl sulfoxide, adding acrylic acid, acrylic acid-2-methoxyethyl ester and potassium persulfate into the solution, continuously stirring for 60min, wherein the mass concentration of each substance in the solution is respectively 10-30 g/L, 200g/L and 2g/L, adding the prepared solution into a polytetrafluoroethylene reaction kettle, and then placing the reaction kettle in a 70 ℃ oven for reaction for 6 hours to finally prepare the graphene composite conductive hydrogel; graphene: acrylic acid: acrylic acid-2-methoxyethyl ester: the mass ratio of the initiator potassium persulfate is 5-15: 100:100: 1.

2. The method for preparing the graphene composite conductive hydrogel sensor suitable for the solvent environment according to claim 1, wherein the steps and conditions are as follows:

Uniformly dispersing 0.1g of graphene in 10mL of a mixed solvent of deionized water and dimethyl sulfoxide, adding 2g of acrylic acid, 2g of acrylic acid-2-methoxyethyl ester and 0.02g of potassium persulfate into the solution, continuously stirring for 60min, wherein the mass concentrations of the substances in the solution are respectively 10-30 g/L, 200g/L and 2g/L, adding the prepared solution into a polytetrafluoroethylene reaction kettle, and then placing the reaction kettle in a 70 ℃ oven for reaction for 6 hours to finally prepare the graphene composite conductive hydrogel; graphene: acrylic acid: acrylic acid-2-methoxyethyl ester: the mass ratio of the initiator potassium persulfate is 5:100:100: 1.

3. The method for preparing the graphene composite conductive hydrogel sensor suitable for the solvent environment according to claim 1, wherein the steps and conditions are as follows:

uniformly dispersing 0.2g of graphene in 10mL of a mixed solvent of deionized water and dimethyl sulfoxide, adding 2g of acrylic acid, 2g of acrylic acid-2-methoxyethyl ester and 0.02g of potassium persulfate into the solution, continuously stirring for 60min, wherein the mass concentrations of the substances in the solution are respectively 10-30 g/L, 200g/L and 2g/L, adding the prepared solution into a polytetrafluoroethylene reaction kettle, and then placing the reaction kettle in a 70 ℃ oven for reaction for 6 hours to finally prepare the graphene composite conductive hydrogel; graphene: acrylic acid: acrylic acid-2-methoxyethyl ester: the mass ratio of the initiator potassium persulfate is 10:100:100: 1.

4. The method for preparing the graphene composite conductive hydrogel sensor suitable for the solvent environment according to claim 1, wherein the steps and conditions are as follows:

Uniformly dispersing 0.3g of graphene in 10mL of a mixed solvent of deionized water and dimethyl sulfoxide, adding 2g of acrylic acid, 2g of acrylic acid-2-methoxyethyl ester and 0.02g of potassium persulfate into the solution, continuously stirring for 60min, wherein the mass concentrations of the substances in the solution are respectively 10-30 g/L, 200g/L and 2g/L, adding the prepared solution into a polytetrafluoroethylene reaction kettle, and then placing the reaction kettle in a 70 ℃ oven for reaction for 6 hours to finally prepare the graphene composite conductive hydrogel; graphene: acrylic acid: acrylic acid-2-methoxyethyl ester: the mass ratio of the initiator potassium persulfate is 15:100:100: 1.

Technical Field

The invention belongs to the technical field of polymer hydrogel, and relates to a preparation method of a graphene composite conductive hydrogel sensor suitable for a solvent environment.

Background

Hydrogels are representative of "soft matter" materials and are widely used in wound dressings, biological glues, tissue adhesives, wearable devices, strain sensors, etc. due to their good softness, biocompatibility, and tissue similarity. In recent years, conductive hydrogels have been widely developed, and researchers have introduced conductive media such as inorganic salts, conductive polymers, liquid metals, and carbon-containing nanomaterials into hydrogel systems to impart excellent conductive properties to hydrogels. Further, the conductive hydrogel is assembled into various flexible sensors, and widely applied to the fields of human motion detection, bio-signal sensing, electronic skin, soft robots, and the like. However, most of the current conductive hydrogels cannot be applied to various solvent environments due to their unstable conductivity under water and solvent environments, which limits the practical application range of the conductive hydrogels. Therefore, the preparation of the hydrogel with stable conductivity in various solvent environments has great significance for the application and development of the hydrogel in the solvent environment.

Disclosure of Invention

in order to realize the stable monitoring and perception of the stress change of the conductive hydrogel material in various solvent environments, the graphene, acrylic acid-2-methoxyethyl ester and potassium persulfate are dissolved in a mixed solution of water and dimethyl sulfoxide, and free radical polymerization reaction is carried out by heating initiation to finally prepare the graphene composite conductive hydrogel. The graphene composite conductive hydrogel prepared by the invention can accurately monitor and sense tensile stress, compressive stress and bending stress in solvent environments such as water, ethanol, chloroform, normal hexane and dodecane. The invention realizes the accurate perception of the soft gel material to the stress change under water and various solvent environments, widens the application range of the conductive hydrogel, and is hopeful to be applied to the fields of gel electrolyte, wearable equipment, soft robots, high-end flexible electronic products and the like under various solvent environments.

The invention relates to a preparation method of a graphene composite conductive hydrogel sensor suitable for a solvent environment, which comprises the following steps and conditions:

Uniformly dispersing graphene in a mixed solvent of deionized water and dimethyl sulfoxide, adding acrylic acid, acrylic acid-2-methoxyethyl ester and potassium persulfate into the solution, continuously stirring for 60min, wherein the mass concentration of each substance in the solution is respectively 10-30 g/L, 200g/L and 2g/L, adding the prepared solution into a polytetrafluoroethylene reaction kettle, and then placing the reaction kettle in a 70 ℃ oven for reaction for 6 hours to finally prepare the graphene composite conductive hydrogel; graphene: acrylic acid: acrylic acid-2-methoxyethyl ester: the mass ratio of the initiator potassium persulfate is 5-15: 100:100: 1.

Has the advantages that: the graphene composite conductive hydrogel sensor prepared by the invention is suitable for a solvent environment, and the conductive hydrogel can accurately monitor and sense the tensile stress, the compressive stress and the bending stress in the solvent environments of water, ethanol, chloroform, normal hexane, dodecane and the like. According to the invention, graphene, acrylic acid-2-methoxyethyl ester and potassium persulfate are dissolved in a mixed solution of water and dimethyl sulfoxide, and are heated to initiate free radical polymerization reaction, so that the graphene composite conductive hydrogel is finally prepared. The invention realizes the accurate perception of the soft gel material to the stress change under water and various solvent environments, and widens the application range of the conductive hydrogel.

Detailed description of the preferred embodiments