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CN-122011454-A - Dielectric reinforced sulfhydrylation multi-wall carbon nano tube/ester SBS elastomer composite film and preparation method thereof

CN122011454ACN 122011454 ACN122011454 ACN 122011454ACN-122011454-A

Abstract

The invention provides a preparation method of a dielectric enhanced sulfhydrylation multi-wall carbon nano tube/esterification SBS elastomer composite film, which comprises the following steps of mixing a hydroxylated multi-wall carbon nano tube, deionized water, absolute ethyl alcohol, pluronic F127 surfactant and gamma-mercaptopropyl triethoxysilane, carrying out sulfhydrylation reaction under the condition of heating and stirring for a period of time, washing a reaction product, drying to obtain the sulfhydrylation multi-wall carbon nano tube, carrying out click chemical reaction on a mixed solution containing SBS, methyl thioglycolate, DMPA purple photoinitiator and tetrahydrofuran under the condition of ultraviolet irradiation and stirring for a period of time, adding a sulfhydrylation multi-wall carbon nano tube/tetrahydrofuran suspension subjected to ultrasonic treatment into a reaction system, continuing to obtain a composite material mixed solution under the condition of ultraviolet irradiation and stirring for a period of time, and carrying out liquid casting on the composite material mixed solution on the surface of a glass plate, and drying under the heating condition to obtain the dielectric enhanced sulfhydrylation multi-wall carbon nano tube/esterification SBS elastomer composite film. The dielectric constant of the composite film is obviously improved compared with that of a pure SBS film, and the composite film has certain self-repairing capability.

Inventors

  • HE FUAN
  • XIAO JIANWU
  • JIANG LIWANG

Assignees

  • 广东石油化工学院

Dates

Publication Date
20260512
Application Date
20260313

Claims (4)

  1. 1. The preparation method of the dielectric reinforced sulfhydrylation multi-wall carbon nano tube/ester SBS elastomer composite film comprises the following steps: Mixing a hydroxylated multiwall carbon nanotube, deionized water, absolute ethyl alcohol, a Pluronic F127 surfactant and gamma-mercaptopropyl triethoxysilane, performing a mercaptoation reaction at 60-85 ℃ with stirring for 20-24 hours, washing a reaction product, and drying at 70-80 ℃ for 20-24 hours to obtain the mercaptoated multiwall carbon nanotube; Mixing SBS, methyl thioglycolate, DMPA purple photoinitiator and tetrahydrofuran, stirring at 20-30 ℃ for 0.5-1 h to form a solution, then carrying out click chemistry reaction on the solution under the condition of 365nm ultraviolet light (40-50W) and stirring for 0.4-0.6 h to obtain esterified SBS, adding a sulfhydrylation multiwall carbon nanotube/tetrahydrofuran suspension subjected to ultrasonic treatment for 0.4-0.6 h, and continuing to obtain a composite material mixed solution under the condition of 365nm ultraviolet light (40-50W) and stirring for 0.4-0.6 h; And (3) casting the composite material mixture on the surface of a glass plate, and drying for 20-24 hours at 70-80 ℃ to obtain the dielectric reinforced sulfhydrylation multi-wall carbon nano tube/esterified SBS elastomer composite film.
  2. 2. The method of claim 1, wherein the hydroxylated multiwall carbon nanotubes, deionized water, absolute ethyl alcohol, pluronic F127 surfactant, and gamma-mercaptopropyl triethoxysilane are present in a ratio of 1 g:20-60 ml:50-200 ml:0.05-0.2 g:0.5-2.5 g.
  3. 3. The method of claim 1, wherein the SBS, methyl thioglycolate, DMPA violet photoinitiator, tetrahydrofuran, and the thiolated multiwall carbon nanotube/tetrahydrofuran suspension are present in a ratio of 5g: 20-25 g: 0.05-0.20 g: 30-70 ml: 0.1-0.3 g/10-25 ml.
  4. 4. The dielectric reinforced sulfhydryl multi-wall carbon nano tube/ester-based SBS elastomer composite film with certain self-repairing capability prepared by the preparation methods of claim 1, claim 2 and claim 3.

Description

Dielectric reinforced sulfhydrylation multi-wall carbon nano tube/ester SBS elastomer composite film and preparation method thereof Technical Field The invention relates to the technical field of SBS dielectric elastomer modification, in particular to a dielectric reinforced sulfhydryl multiwall carbon nanotube/esterified SBS elastomer composite film and a preparation method thereof. Background The dielectric elastomer polymer has the advantages of large electric deformation, quick deformation recovery, good flexibility, high energy density, short response time, high conversion efficiency, light weight, low manufacturing cost and the like, and has wide application prospect in the fields of drivers, sensors, mechanical energy collection systems, soft robots, electronic skins, artificial muscles and the like. However, the application of the dielectric elastomer polymer still has two major restriction factors at present, namely (1) the dielectric constant is low (usually below 10), so that the high-voltage electric field is often required to drive the dielectric elastomer polymer to meet the deformation requirement of practical use, and (2) the high-voltage electric field and the pre-stretching operation before use are easy to cause the electric breakdown of the material, and the repeated expansion and contraction in the use process inevitably cause mechanical damage to the material. Therefore, (1) how to increase the dielectric constant of the material so as to increase the electro-deformation capability as much as possible under the condition of limited driving electric field and (2) how to enable the material to self-repair the wound caused by the electric field and the force field so as to prolong the service life are two important research subjects in the current dielectric elastomer field. The triblock polystyrene-polybutadiene-polystyrene (SBS) elastomer has good deformability and higher electric field breakdown strength, but the dielectric constant is only about 2. It is notable that the polybutadiene segment of SBS contains double bonds, creating conditions for further functional modification thereof to enhance performance. Therefore, the ester group-containing compound is grafted on the polybutadiene chain segment of SBS through click chemistry reaction, so that the dielectric constant of the material is improved, and the self-repairing of the damage of the material is realized. In addition, the multi-wall carbon nano tube is used as a common dielectric enhancement function filler, has excellent conductivity, and the unique high length-diameter ratio is favorable for forming a large number of micro capacitor structures under the condition of small filling amount, so that if the multi-wall carbon nano tube and the esterified SBS elastomer can be effectively compounded, the dielectric constant of the obtained composite material is expected to be greatly improved. And the thiol surface modification of the multiwall carbon nanotube is expected to increase the interfacial compatibility between the multiwall carbon nanotube and the esterified SBS elastomer obtained by grafting methyl thioglycolate. Disclosure of Invention The invention aims to provide a dielectric reinforced sulfhydryl multi-wall carbon nano tube/esterified SBS elastomer composite film and a preparation method thereof, wherein the dielectric constant of the composite film is obviously improved compared with that of a pure SBS film, and the composite film has certain self-repairing capability. In order to achieve the above object, the present invention provides the following technical solutions: the invention provides a preparation method of a dielectric enhanced sulfhydrylation multi-wall carbon nano tube/esterification SBS elastomer composite film, which comprises the following steps: Mixing a hydroxylated multiwall carbon nanotube, deionized water, absolute ethyl alcohol, a polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer (Pluronic F127 surfactant) and gamma-mercaptopropyl triethoxysilane, then carrying out a thiolation reaction under the condition of 60-85 ℃ and stirring for 20-24 hours, washing a reaction product, and drying for 20-24 hours under the condition of 70-80 ℃ to obtain the thiolated multiwall carbon nanotube; Mixing SBS, methyl thioglycolate, 2-dimethoxy-2-phenylacetophenone (DMPA) and tetrahydrofuran, stirring at 20-30 ℃ for 0.5-1 h to form a solution, then carrying out click chemistry reaction on the solution under the condition of 365nm ultraviolet light (40-50W) irradiation and stirring for 0.4-0.6 h to obtain esterified SBS, adding a sulfhydrylation multiwall carbon nano tube/tetrahydrofuran suspension subjected to ultrasonic treatment for 0.4-0.6 h into a reaction system, and continuing to carry out ultraviolet light (40-50W) irradiation and stirring for 0.4-0.6 h to obtain a composite material mixed solution; And (3) casting the composite material mixture on the surface of a glass plate, and drying