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A method for improving the dielectric properties of elastomers

A bulk dielectric and elastomer technology, applied in the field of elastomer preparation with high intrinsic dielectric properties, can solve the problems of low electrical breakdown strength of materials, lower processing performance of elastomers, easy debonding of fillers, etc., and achieve high electrical drive sensitivity degree, increase the dielectric constant, and the effect of simple preparation process

Active Publication Date: 2018-06-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently widely used method is to add high dielectric ceramics (such as barium titanate) to the elastomer. 1 ), conductive fillers (such as carbon nanotubes 2 ) or conductive polymers (such as polyaniline 3 ), etc., such as the Chinese patent application "High Dielectric Composite Material Containing Carbon Nanotubes and Its Preparation Method" (Patent Application No. 03104776.9), which proposes a method using carbon nanotubes (CNT) and barium titanate (BaTiO 3 ) and polyvinylidene fluoride (PVDF) are prepared by hot pressing method to prepare a dielectric composite material. Although the dielectric constant of the dielectric composite material can reach 450 at 100 Hz, the filler content is near the percolation threshold. When the dielectric loss of the material increases significantly, the electrical breakdown strength of the material is low, and it is difficult to obtain large deformation at low voltage.
Generally speaking, such methods usually increase the modulus significantly while increasing the dielectric constant of the elastomer. At the same time, it is difficult to ensure the uniform dispersion of the filler, which makes the filler easy to debond during the repeated deformation of the material, which in turn causes material damage. , and the addition of fillers reduces the processing performance of the elastomer, making it difficult to prepare elastomer films with uniform quality

Method used

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  • A method for improving the dielectric properties of elastomers
  • A method for improving the dielectric properties of elastomers
  • A method for improving the dielectric properties of elastomers

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Dissolve 5g of SBS elastomer in 50ml of tetrahydrofuran, blow nitrogen into it, exhaust the air, add 0.3g of MMMP, 30ml of methyl thioglycolate, and transfer to a UV lamp (wavelength 365nm, power 500w) under airtight conditions to irradiate for 30min , add n-hexane to precipitate, then dissolve in tetrahydrofuran after suction filtration, precipitate again, repeat 3 times to remove unreacted small molecules, dry the product under vacuum for 10h, and then mold it at 150°C and 10MPa to obtain an elastomer film .

[0028] Its elastic modulus is 0.26kPa; the relationship between the dielectric constant and the frequency change at room temperature, 10 3 The electrical sensitivity at Hz and the relationship between the driving electric field strength and the electro-induced deformation are as follows: figure 1 , figure 2 and image 3 Curve 1 in .

Embodiment 2

[0030] Dissolve 4g of SBS elastomer in 60ml of tetrahydrofuran, blow nitrogen into it, exhaust the air, add 0.4g of DMPA, 50ml of methyl thioglycolate, and transfer to a UV lamp (wavelength 350nm, power 600w) under airtight conditions to irradiate for 50min , add n-hexane to precipitate, then dissolve in tetrahydrofuran after suction filtration, precipitate again, repeat 3 times to remove unreacted small molecules, dry the product under vacuum for 15 hours, and then mold it at 140°C and 12MPa to obtain an elastomer film .

[0031] Its elastic modulus is 0.36kPa; the relationship between dielectric constant and frequency change at room temperature, 10 3 The electrical sensitivity at Hz and the relationship between the driving electric field strength and the electro-induced deformation are as follows: figure 1 , figure 2 and image 3 Curve 2 in .

Embodiment 3

[0033] Dissolve 5g of SBS elastomer in 50ml of tetrahydrofuran, pass through nitrogen, and after exhausting the air, add 0.5g of DMPA, 50ml of 2-cyanoethanethiol, and transfer to a UV lamp (wavelength 370nm, power 400w) under airtight conditions for irradiation React for 45 minutes, remove the solvent in vacuum, put it into a dialysis bag, and dialyze in ethanol for 3 days, dry the product under vacuum for 12 hours, and then mold it at 120°C and 10MPa to obtain an elastomer film.

[0034] Its elastic modulus is 0.3kPa; the relationship between dielectric constant and frequency change at room temperature, 10 3 The electrical sensitivity at Hz and the relationship between the driving electric field strength and the electro-induced deformation are as follows: figure 1 , figure 2 and image 3 Curve 3 in .

[0035] Untreated SBS modulus of elasticity is 0.5kPa, the relationship between the dielectric constant and the frequency change at room temperature, 10 3 The electrical sens...

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Abstract

The invention relates to a method for improving the dielectric properties of elastomers, which belongs to the preparation method of elastomers with high intrinsic dielectric properties. Using the molecular design grafting modification method, the polar group is grafted on the substrate, and the dielectric constant is increased by improving its molecular polarization ability. This method can significantly increase the dielectric constant while reducing the modulus, so the resulting product has high electrical sensitivity and can produce large deformation at a very low external voltage.

Description

Technical field: [0001] The invention relates to a method for improving the dielectric properties of elastomers, which belongs to the preparation method of elastomers with high intrinsic dielectric properties. The method can effectively improve the dielectric constant of elastomers and at the same time improve electrical sensitivity, and can produce large deformation under small driving voltage . Background technique: [0002] Dielectric Elastomer (Dielectric Elastomer) is a kind of electroactive polymer, which has many excellent properties, such as large electro-induced deformation, fast response time, high elastic energy density, high energy coupling efficiency, light weight and potential high conversion efficiency. specialty. It has broad application prospects in the fields of artificial muscles, drives, micro-robots and prosthetic organs. [0003] However, the existing dielectric elastomers have a very low dielectric constant and are weakly sensitive to external electr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F297/04C08F8/34C08F2/48C08G77/392C08C19/20C08C19/22
Inventor 田明孙海斌宁南英张立群
Owner BEIJING UNIV OF CHEM TECH