Self-repairing dielectric elastomer composite material and preparation method thereof

Abstract

The invention discloses a self-repairing dielectric elastomer composite material and a preparation method thereof. The self-repairing dielectric elastomer composite material is prepared from the following raw materials in parts by weight: 60-80 parts of polyacrylic acid, 20-40 parts of hydroxyl-terminated polydimethylsiloxane, 5-25 parts of a Ti3C2 filler and 0.7-1.3 parts of a catalyst, wherein the catalyst is N, N ''-dicyclohexylcarbodiimide and 4-(dimethylamino) pyridine. The Ti3C2 filler, hydroxyl-terminated polydimethylsiloxane and polyacrylic acid are dispersed in the organic solvent, and react under the action of the catalyst, so that the self-repairing dielectric elastomer composite material is obtained. According to the invention, the self-repairing performance is excellent, the self-repairing efficiency of the electric driving performance after repairing for 2 h at the room temperature is up to 95% or more, the good dielectric property is provided, the high electric driving strain can be obtained under the low driving electric field intensity, and the preparation method is simple and efficient.

Description

technical field

[0001] The invention relates to the field of self-repairing dielectric elastomer composite materials, in particular to a self-repairing dielectric elastomer composite material and a preparation method thereof. Background technique

[0002] Dielectric elastomer actuators (DEA) can deform under the stimulation of an external electric field and convert electrical energy into mechanical energy, which is expected to become a new generation of micro-actuators with large displacement. Since the traditional DEA cannot repair and heal independently, once the DEA is damaged by external mechanical or chemical factors in practical application, it will lose its original performance, which will greatly reduce the service life of the material and cause a lot of waste of resources and environmental pollution. Inspired by the ability of organisms to heal wounds autonomously, the design and synthesis of DEA with self-healing function has attracted extensive attention of resea...

Examples

preparation example Construction

[0030] Specifically, the preparation method of the self-healing dielectric elastomer composite material may include: 5-25 parts by weight of Ti 3 C 2Filler, 20-40 parts of hydroxyl-terminated polydimethylsiloxane and 60-80 parts of polyacrylic acid are dispersed in an organic solvent (the organic solvent is toluene, tetrahydrofuran, chloroform, N,N-dimethylformamide at least one of them), and in 0.7 to 1.3 parts of catalyst (the catalyst is preferably composed of 0.4 to 0.8 parts of N, N"-dicyclohexylcarbodiimide and 0.3 to 0.5 parts of 4-(dimethylamino)pyridine Composition) under the catalysis reaction, thereby prepare above-mentioned self-healing dielectric elastomer composite material.This preparation method specifically can comprise the following steps:

[0031] Step 1. According to every 5-25g of Ti 3 C 2 Filler use 50~250mL of organic solvent ratio, the Ti 3 C 2 The filler is dispersed in the organic solvent to form a first solution.

[0032] Step 2. For every 60-8...

Embodiment 1

[0044] A kind of self-healing dielectric elastomer composite material, its preparation method can comprise the following steps:

[0045] Step a, disperse 2g of lithium fluoride powder in 40mL of hydrochloric acid solution with a concentration of 9mol / L, place on a magnetic stirrer and stir at room temperature for 10min, so that the lithium fluoride powder is uniformly dispersed in the hydrochloric acid solution to obtain etchant; then 1 g of Ti in the MAX phase 3 AlC 2 The powder is added into the etchant for etching within 5 minutes to form a mixed liquid.

[0046] Step b, using deionized water and ethanol to alternately wash the mixed solution described in step a until the pH value is 5 to 6, centrifuge to obtain the supernatant, filter and dry, and repeat multiple groups to obtain a large amount of Ti 3 C 2 filler.

[0047] Step c, the Ti of 5g 3 C 2 The filler was ultrasonically dispersed in 50 mL of tetrahydrofuran to form a first solution.

[0048] Step d, ultraso...

Embodiment 2

[0054] A kind of self-healing dielectric elastomer composite material, its preparation method is basically the same as above-mentioned embodiment 1, and its difference is: Ti in the step c 3 C 2 The amount of filler used was 15 g.

technical field

[0001] The invention relates to the field of self-repairing dielectric elastomer composite materials, in particular to a self-repairing dielectric elastomer composite material and a preparation method thereof. Background technique

[0002] Dielectric elastomer actuators (DEA) can deform under the stimulation of an external electric field and convert electrical energy into mechanical energy, which is expected to become a new generation of micro-actuators with large displacement. Since the traditional DEA cannot repair and heal independently, once the DEA is damaged by external mechanical or chemical factors in practical application, it will lose its original performance, which will greatly reduce the service life of the material and cause a lot of waste of resources and environmental pollution. Inspired by the ability of organisms to heal wounds autonomously, the design and synthesis of DEA with self-healing function has attracted extensive attention of resea...

Examples

preparation example Construction

[0030] Specifically, the preparation method of the self-healing dielectric elastomer composite material may include: 5-25 parts by weight of Ti 3 C 2Filler, 20-40 parts of hydroxyl-terminated polydimethylsiloxane and 60-80 parts of polyacrylic acid are dispersed in an organic solvent (the organic solvent is toluene, tetrahydrofuran, chloroform, N,N-dimethylformamide at least one of them), and in 0.7 to 1.3 parts of catalyst (the catalyst is preferably composed of 0.4 to 0.8 parts of N, N"-dicyclohexylcarbodiimide and 0.3 to 0.5 parts of 4-(dimethylamino)pyridine Composition) under the catalysis reaction, thereby prepare above-mentioned self-healing dielectric elastomer composite material.This preparation method specifically can comprise the following steps:

[0031] Step 1. According to every 5-25g of Ti 3 C 2 Filler use 50~250mL of organic solvent ratio, the Ti 3 C 2 The filler is dispersed in the organic solvent to form a first solution.

[0032] Step 2. For every 60-8...

Embodiment 1

[0044] A kind of self-healing dielectric elastomer composite material, its preparation method can comprise the following steps:

[0045] Step a, disperse 2g of lithium fluoride powder in 40mL of hydrochloric acid solution with a concentration of 9mol / L, place on a magnetic stirrer and stir at room temperature for 10min, so that the lithium fluoride powder is uniformly dispersed in the hydrochloric acid solution to obtain etchant; then 1 g of Ti in the MAX phase 3 AlC 2 The powder is added into the etchant for etching within 5 minutes to form a mixed liquid.

[0046] Step b, using deionized water and ethanol to alternately wash the mixed solution described in step a until the pH value is 5 to 6, centrifuge to obtain the supernatant, filter and dry, and repeat multiple groups to obtain a large amount of Ti 3 C 2 filler.

[0047] Step c, the Ti of 5g 3 C 2 The filler was ultrasonically dispersed in 50 mL of tetrahydrofuran to form a first solution.

[0048] Step d, ultraso...

Embodiment 2

[0054] A kind of self-healing dielectric elastomer composite material, its preparation method is basically the same as above-mentioned embodiment 1, and its difference is: Ti in the step c 3 C 2 The amount of filler used was 15 g.

Images