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CN-122016098-A - Self-repairing ion gel, self-repairing ion gel sensor, and preparation method and application thereof

CN122016098ACN 122016098 ACN122016098 ACN 122016098ACN-122016098-A

Abstract

The invention provides self-repairing ionic gel, a self-repairing ionic gel sensor and a preparation method and application thereof, and belongs to the field of intelligent high polymer materials. The self-repairing ionic gel sensor sequentially comprises a first electrode layer, a self-repairing ionic gel sensing layer and a second electrode layer from top to bottom, wherein the self-repairing ionic gel comprises a semi-interpenetrating polymer network, lithium salt and a solvent, wherein the lithium salt and the solvent are dispersed in the semi-interpenetrating polymer network, and the semi-interpenetrating polymer network is formed by penetrating linear polyacrylic acid into a cross-linked network of poly (hydroxyethyl acrylate-co-hydroxyethyl methacrylate). The self-repairing ion gel sensor can convert external mechanical stimulus such as pressure, stretching and the like into measurable resistance or capacitance signal change, and has the advantages of high sensitivity, wide detection range, low hysteresis and quick response.

Inventors

  • CHANG ZIXUAN
  • LI CHUANG

Assignees

  • 中国科学技术大学先进技术研究院

Dates

Publication Date
20260512
Application Date
20260410

Claims (10)

  1. 1. The self-repairing ionic gel sensor is characterized by comprising a first electrode layer, a self-repairing ionic gel sensing layer and a second electrode layer from top to bottom in sequence; The self-repairing ionic gel sensing layer comprises self-repairing ionic gel, wherein the self-repairing ionic gel comprises a semi-interpenetrating polymer network, lithium salt dispersed in the semi-interpenetrating polymer network and a solvent; Wherein the semi-interpenetrating polymer network is formed from linear polyacrylic acid throughout a crosslinked network of poly (hydroxyethyl acrylate-co-hydroxyethyl methacrylate).
  2. 2. The self-healing ion gel sensor of claim 1, wherein the thickness of the first electrode layer and the second electrode layer are each independently 0.01-0.1mm; The thickness of the self-repairing ion gel sensing layer is 0.5-1cm.
  3. 3. A self-healing ionic gel comprising a semi-interpenetrating polymer network, a lithium salt dispersed in the semi-interpenetrating polymer network, and a solvent; Wherein the semi-interpenetrating polymer network is formed from linear polyacrylic acid throughout a crosslinked network of poly (hydroxyethyl acrylate-co-hydroxyethyl methacrylate).
  4. 4. The self-healing ionic gel according to claim 3, wherein the mass ratio of the linear polyacrylic acid to the poly (hydroxyethyl acrylate-co-hydroxyethyl methacrylate) is 0.05:1-0.2:1; The mass ratio of the total mass of the linear polyacrylic acid and the poly (hydroxyethyl acrylate-co-hydroxyethyl methacrylate) to the solvent is (0.5-2): 1.
  5. 5. The self-healing ion gel according to claim 3, wherein the mass content of the lithium salt is 1% to 10% based on the total mass of the self-healing ion gel; the lithium salt is at least one of lithium chloride and lithium bis (trifluoromethane sulfonate); The solvent is polyethylene glycol, and the average molecular weight of the polyethylene glycol is 200-600.
  6. 6. A method for preparing the self-healing ionic gel according to any one of claims 3 to 5, comprising: mixing acrylic acid, a photoinitiator and a solvent, and reacting under illumination to obtain a polyacrylic acid solution; Mixing the polyacrylic acid solution, hydroxyethyl acrylate, hydroxyethyl methacrylate, a cross-linking agent, a thermal initiator and lithium salt, and performing heating reaction to obtain the self-repairing ionic gel.
  7. 7. The preparation method according to claim 6, wherein the photoinitiator is at least one of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4-methylthiophenyl) -2-morpholino-1-propanone and benzophenone; The cross-linking agent is at least one of poly (ethylene glycol) dimethacrylate and divinylbenzene; the thermal initiator is at least one of azodiisobutyronitrile, azodiiso Ding Mi hydrochloride, 4-4' -azobis (4-cyanovaleric acid), dibenzoyl peroxide, hydroperoxide, dialkyl peroxide, peroxyester and peroxydicarbonate.
  8. 8. The method according to claim 6, wherein the ratio of the total mass of acrylic acid, hydroxyethyl acrylate, hydroxyethyl methacrylate to the mass of the solvent is 0.5:1 to 2:1; the ratio of the mass of the cross-linking agent to the total mass of the hydroxyethyl acrylate and the hydroxyethyl methacrylate is 0.001:1-0.05:1.
  9. 9. The method according to claim 6, wherein the heating temperature of the heating reaction is 40-60 ℃ and the heating time is 7-9h.
  10. 10. Use of a self-healing ionic gel sensor according to any one of claims 1 to 2 or a self-healing ionic gel according to any one of claims 3 to 5 in electronic skin.

Description

Self-repairing ion gel, self-repairing ion gel sensor, and preparation method and application thereof Technical Field The invention relates to the field of intelligent high polymer materials, in particular to self-repairing ionic gel, a self-repairing ionic gel sensor, a preparation method and application thereof. Background With the rapid development of robot technology, robots have been widely used in industrial manufacturing, medical assistance, home services, man-machine collaboration, and other scenarios. In order to enable the robot to interact with human beings and dynamic environments more safely and intelligently, it is important to endow the robot with a touch perception capability similar to human skin. The robot skin can detect various physical signals such as external force, deformation, temperature and the like in real time through integrating the flexible sensor, so that accurate sensing and feedback of contact objects, operation force and external environment are realized, and the robot skin becomes a key component for improving autonomy and adaptability of the robot. In addition, to ensure long-term reliable operation, the robot skin also needs to have tolerance and recovery capabilities against mechanical wear, accidental scratches, etc. Currently, flexible sensors are becoming an ideal choice for robotic skin haptic systems due to their good stretchability, fit, and mechanical durability. Among them, ionic gels exhibit significant advantages in the field of flexible sensing by virtue of excellent ionic conductivity as well as elasticity, structural designability, and good environmental stability, and are considered as one of important materials for constructing multi-modal sensing robot skin. The sensor based on the ionic gel can convert mechanical deformation such as pressure, stretching, bending and the like into a measurable electrical signal, so that the robot can identify the grasping force, surface texture, gesture actions and even complex environment contact states, and is further applied to various scenes such as precise grasping, safe interaction, bionic operation, emotion expression and the like. However, in the practical application process, the problems of limited mechanical strength, easy damage, insufficient adhesion and the like still exist. Disclosure of Invention In view of the above, in order to at least partially solve at least one of the above-mentioned technical problems, the present invention provides a self-repairing ion gel, a self-repairing ion gel sensor, and a preparation method and an application thereof. According to an embodiment of the first aspect of the invention, a self-repairing ionic gel sensor is provided, which sequentially comprises a first electrode layer, a self-repairing ionic gel sensing layer and a second electrode layer from top to bottom, wherein the self-repairing ionic gel comprises a semi-interpenetrating polymer network, lithium salt dispersed in the semi-interpenetrating polymer network and a solvent, and the semi-interpenetrating polymer network is formed by penetrating linear polyacrylic acid in a cross-linked network of poly (hydroxyethyl acrylate-co-hydroxyethyl methacrylate). According to an embodiment of the second aspect of the present invention, there is provided a self-healing ionic gel comprising a semi-interpenetrating polymer network, a lithium salt dispersed in the semi-interpenetrating polymer network, and a solvent, the semi-interpenetrating polymer network being formed from linear polyacrylic acid throughout a crosslinked network of poly (hydroxyethyl acrylate-co-hydroxyethyl methacrylate). According to an embodiment of the third aspect of the invention, a preparation method of self-repairing ionic gel is provided, which comprises the steps of mixing acrylic acid and a photoinitiator with a solvent, reacting under illumination to obtain a polyacrylic acid solution, mixing the polyacrylic acid solution, hydroxyethyl acrylate, hydroxyethyl methacrylate, a cross-linking agent, a thermal initiator and lithium salt, and heating to react to obtain the self-repairing ionic gel. According to an embodiment of the fourth aspect of the present invention there is provided the use of a self-healing ionic gel or a self-healing ionic gel sensor in electronic skin. According to an embodiment of the present invention, the present invention provides a self-repairing ionic gel (hereinafter referred to as "gel") sensor, wherein the self-repairing ionic gel is based on a cross-linked network of linear polyacrylic acid and poly (hydroxyethyl acrylate-co-hydroxyethyl methacrylate), and a gel system with a semi-interpenetrating polymer network structure is formed, and lithium salt is used as an ion conducting medium. The unique semi-interpenetrating polymer network not only improves the mechanical strength, rebound resilience and self-repairing capability after damage of gel through the physical winding action between multiple hydrogen bonds and