Conductive hydrogel with high transparency and high mechanical property and preparation method thereof

Abstract

The invention relates to the technical field of hydrogel materials, in particular to conductive hydrogel with high transparency and high mechanical properties and a preparation method of the conductive hydrogel. The preparation method comprises the following steps: adding carboxylated multi-walled carbon nanotubes (MWCNT-COOH) and catechin into deionized water, and uniformly mixing the solution; the obtained solution is subjected to ultrasonic treatment for 30 min, and catechin modified self-assembled MWCNT-COOH is obtained; aM, BACA and KPS are added into the obtained catechin modified self-assembled MWCNT-COOH solution, deionized water is added to dilute the solution, and the dilution multiple is 10 times. And placing the solution in a drying oven, keeping at 60 DEG C for 6 hours, then placing in a refrigerator, refrigerating at 4 DEG C, and standing for 12 hours to obtain the conductive hydrogel with high transparency and high mechanical property. The preparation process is simple and easy to implement, the raw materials are stable in property, and the biocompatibility is high.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogel materials, and in particular to a high-transparency and high-mechanical-performance conductive hydrogel and a preparation method thereof. Background Art

[0002] As electronic devices develop towards wearable and portable devices, the demand for electronic materials with good flexibility and mechanical adaptability is growing, and the research and development of new flexible electronic materials has become a key research direction in this field. Conductive hydrogel, as a semi-solid ion conductor, has attracted widespread attention in the field of flexible electronic devices due to its good biocompatibility, high strength, high toughness and many other advantages.

[0003] However, it is still a huge challenge to prepare a hydrogel that can be widely used under various conditions and has multiple functions. Most reported hydrogels show poor conductivity, mechanical strength, self-healing ability, light transmittance, etc. in applications, which leads to many limitations in practical applications. With the increase of cross-linking density, the mechanical strength and elasticity of the hydrogel will increase because more cross-linking points provide additional mechanical support. However, cross-linking points may hinder the free migration of ions and increase the resistance to ion migration, thereby affecting the conductivity. At the same time, the transmittance will decrease due to the scattering of light through the hydrogel by the cross-linking points. Reducing the addition of conductive media in order to improve transmittance may also have a negative impact on conductivity. The reduction of conductive media will reduce the path for electron transmission. Therefore, it is difficult to maintain high mechanical strength, high conductivity and high transmittance at the same time.

[0004] Therefore, when designing hydrogels, these properties need to be carefully balanced to ensure that the final material can meet the needs of specific applications. Through careful material selection and process optimization, hydrogels with high mechanical strength, high transparency and good conductivity can be achieved. Summary of the invention

[0005] In view of the shortcomings of existing conductive hydrogels, the present invention proposes a conductive hydrogel with high transparency and high mechanical properties and a preparation method thereof, so as to solve the technical problems of insufficient conductive properties and mechanical properties and poor transparency of carbon nanotube hydrogels prepared using existing technologies and raw materials.

[0006] The technical solution adopted by the present invention is as follows: A method for preparing a conductive hydrogel with high transparency and high mechanical properties, comprising the following steps:

[0007] Step 1, adding carboxylated multi-walled carbon nanotubes MWCNT-COOH and catechin to deionized water, wherein the mass ratio of carboxylated multi-walled carbon nanotubes MWCNT-COOH, catechin to deionized water is 1:10:

[0008] 100000, mix the solution evenly;

[0009] Step 2, subjecting the solution obtained in step 1 to ultrasonic treatment at an ultrasonic frequency of 40 kHz for 30 min to obtain catechin-modified self-assembled MWCNT-COOH;

[0010] Step 3, adding to the catechin-modified self-assembled MWCNT-COOH solution obtained in step 2, at a mass ratio of 40000:

[0011] Add acrylamide AM, N,N'-bis(acryloyl)cystamine BACA and potassium peroxydisulfate KPS in a ratio of 120:600 and mix, then add deionized water to dilute the solution to a dilution factor of 10 times;

[0012] Step 4: Place the solution obtained in step 3 in an oven at 60°C for 6 hours, and then place in a refrigerator at 4°C for 12 hours.

[0013] The conductive hydrogel Catechin / MWCNT-COOH / AM / BACA / KPS with high transparency and high mechanical properties can be obtained.

[0014] The beneficial technical effects of the present invention are as follows: a conductive hydrogel is prepared, and the conductive network is composed of ultra-low content carboxyl multi-walled carbon nanotubes (MWCNT-COOH) and spontaneously assembled catechins; a large amount of π-π interactions between carboxyl multi-walled carbon nanotubes (MWCNT-COOH) and catechins provide the conductive hydrogel with excellent mechanical properties, including high stretchability and strong adhesion; and high transparency is achieved, and its transparency is much higher than that of conductive hydrogels prepared by existing technologies and raw materials. The preparation process of the method is simple and easy, the raw materials are stable in nature, and the biocompatibility is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a flow chart of the preparation method of the present invention; Figure 2 is the stress-strain curve of the hydrogel;

[0016] Figure 3 This is the stress-strain curve of the hydrogel cyclic tensile experiment; Figure 4 is the adhesion of hydrogel to different materials;

[0017] Figure 5 is the transmittance of the hydrogel at different wavelengths of light; Figure 6 is the electrical conductivity of the hydrogel under different conditions;

[0018] Figure 7 is the electrical conductivity of the hydrogel under different stretching conditions. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with specific embodiments and the accompanying drawings. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] Example 1: A method for preparing a conductive hydrogel with high transparency and high mechanical properties, such as Figure 1 As shown, the specific implementation steps are as follows:

[0021] Step 1, adding carboxylated multi-walled carbon nanotubes MWCNT-COOH and catechin to deionized water, wherein the mass ratio of carboxylated multi-walled carbon nanotubes MWCNT-COOH, catechin and deionized water is 1:10:100000, and mixing the solution evenly.

[0022] Step 2: subjecting the solution obtained in step 1 to ultrasonic treatment at 40 kHz for 30 minutes to obtain catechin-modified self-assembled MWCNT-COOH.

[0023] Step 3, adding acrylamide AM, N,N'-bis(acryloyl)cystamine BACA and potassium peroxydisulfate KPS in a mass ratio of 40000:120:600 to the catechin-modified self-assembled MWCNT-COOH solution obtained in step 2, and then adding deionized water to dilute the solution to a dilution factor of 10 times.

[0024] Step 4, placing the solution obtained in step 3 in an oven at 60°C for 6 hours, and then refrigerating it in a refrigerator at 4°C for 12 hours to obtain a conductive hydrogel Catechin / MWCNT-COOH / AM / BACA / KPS with high transparency and high mechanical properties.

[0025] Example 2, preparation of MWCNT-COOH / AM / BACA / KPS hydrogel, specifically implemented according to the following steps:

[0026] Step 1: add 0.1 mg of carboxylated multi-walled carbon nanotubes MWCNT-COOH into 10 mL of deionized water, and mix the solution evenly.

[0027] Step 2, subjecting the solution obtained in step 1 to ultrasonic treatment, with an ultrasonic wave frequency of 40 kHz and a treatment time of 30 min.

[0028] Step 3, add 4 g acrylamide AM, 12 mg N,N'-bis(acryloyl)cystamine BACA and 60 mg potassium peroxodisulfate KPS to the MWCNT-COOH solution obtained in step 2, and add deionized water to dilute the solution by 10 times.

[0029] Step 4, placing the solution obtained in step 3 in an oven at 60° C. for 6 hours, and then placing it in a refrigerator at 4° C. for 12 hours to obtain MWCNT-COOH / AM / BACA / KPS hydrogel.

[0030] Example 3, preparation of Catechin / MWCNT-COOH / AM / BACA / KPS hydrogel, specifically implemented according to the following steps:

[0031] Step 1, add 0.1 mg of carboxylated multi-walled carbon nanotube MWCNT-COOH and 1 mg of catechin to 10 mL of deionized water, and mix the solution evenly.

[0032] Step 2, subjecting the solution obtained in step 1 to ultrasonic treatment at 40 kHz for 30 min to obtain catechin-modified self-assembled MWCNT-COOH.

[0033] Step 3, add 4 g acrylamide AM, 12 mg N,N'-bis(acryloyl)cystamine BACA and 60 mg potassium peroxydisulfate KPS to the catechin-modified self-assembled MWCNT-COOH solution obtained in step 2, and add deionized water to dilute the solution by 10 times.

[0034] Step 4, placing the solution obtained in step 3 in an oven at 60° C. for 6 hours, and then placing it in a refrigerator at 4° C. for more than 12 hours to obtain Catechin / MWCNT-COOH / AM / BACA / KPS hydrogel.

[0035] Effect of the invention: The mechanical properties of the prepared conductive hydrogel with high transparency and high mechanical properties are characterized. Figure 2 This is the stress-strain diagram of the conductive hydrogel with high transparency and high mechanical properties under the tensile test. Figure 3 The stress-strain diagram of the conductive hydrogel with high transparency and high mechanical properties under cyclic stretching test. It can be seen that the hydrogel has good stretchability and excellent mechanical properties.

[0036] The adhesion properties of the prepared conductive hydrogel with high transparency and high mechanical properties were tested. Figure 4 The adhesion strength of the conductive hydrogel with high transparency and high mechanical properties to different materials. It can be seen from the figure that the hydrogel has strong adhesion.

[0037] The transmittance of the prepared conductive hydrogel with high transparency and high mechanical properties was tested. Figure 5 The transmittance of the conductive hydrogel with high transparency and high mechanical properties to light of different wavelengths. As can be seen from the figure, the transmittance of the hydrogel is much higher than that of existing conductive hydrogels, and can be used in a variety of scenarios such as optical lenses.

[0038] The conductivity of the prepared conductive hydrogel with high transparency and high mechanical properties was tested. Figure 6 The conductivity of the hydrogel in different states measured by a digital multimeter. Figure 7 is the conductivity of the hydrogel under different stretching conditions. This shows that the hydrogel has strong conductivity in different states and under different stretching conditions, and can be used in a variety of scenarios such as sensors and flexible electronic devices.

[0039] In summary, by testing the various properties of the prepared conductive hydrogel with high transparency and high mechanical properties, it is proved that it has excellent mechanical properties, transmittance and conductivity. At the same time, its stable properties and good biocompatibility enable it to be used in a variety of biomedical fields, such as wearable flexible electronic devices, drug release systems and artificial lenses.

[0040] The above specific implementation modes are used to explain the present invention rather than to limit the present invention. Any modification and change made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A high-transparency and high-mechanical-performance conductive hydrogel and a preparation method thereof, characterized in that: The preparation method steps are as follows: Step 1, adding carboxylated multi-walled carbon nanotubes MWCNT-COOH and catechin to deionized water, wherein the mass ratio of carboxylated multi-walled carbon nanotubes MWCNT-COOH, catechin and deionized water is 1:10:100000, and mixing the solution evenly; Step 2, subjecting the solution obtained in step 1 to ultrasonic treatment at an ultrasonic frequency of 40 kHz for 30 min to obtain catechin-modified self-assembled MWCNT-COOH; Step 3, adding acrylamide AM, N,N'-bis(acryloyl)cystamine BACA and potassium peroxydisulfate KPS in a mass ratio of 40000:120:600 to the catechin-modified self-assembled MWCNT-COOH solution obtained in step 2, and then adding deionized water to dilute the solution to a dilution factor of 10 times; Step 4, placing the solution obtained in step 3 in an oven at 60°C for 6 hours, and then refrigerating it in a refrigerator at 4°C for 12 hours to obtain a conductive hydrogel Catechin / MWCNT-COOH / AM / BACA / KPS with high transparency and high mechanical properties.

2. A high-transparency and high-mechanical-performance conductive hydrogel and a preparation method thereof according to claim 1, characterized in that: The preparation method steps are as follows: Step 1, add 0.1 mg of carboxylated multi-walled carbon nanotube MWCNT-COOH and 1 mg of catechin to 10 mL of deionized water, and mix the solution evenly. Step 2, subjecting the solution obtained in step 1 to ultrasonic treatment at 40 kHz for 30 min to obtain catechin-modified self-assembled MWCNT-COOH. Step 3, add 4 g acrylamide AM, 12 mg N,N'-bis(acryloyl)cystamine BACA and 60 mg potassium peroxydisulfate KPS to the catechin-modified self-assembled MWCNT-COOH solution obtained in step 2, and add deionized water to dilute the solution by 10 times. Step 4, placing the solution obtained in step 3 in an oven at 60° C. for 6 hours, and then placing it in a refrigerator at 4° C. for more than 12 hours to obtain Catechin / MWCNT-COOH / AM / BACA / KPS hydrogel.

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