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A high-performance giant electrorheological elastomer and its preparation and testing methods

An electrorheological elastomer, high-performance technology, used in the application of stable tension/pressure to test the strength of materials, measuring devices, strength characteristics, etc. Difficult to achieve and other problems, to achieve the effect of reducing the flow loss of silicone oil, high relative electrorheological effect, and enhanced interface polarization

Active Publication Date: 2022-03-25
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The inventors of the present invention have discovered that electrorheological elastomers have the following disadvantages: the relative electrorheological effect is not high, thereby limiting the range of stiffness regulation
In the prior art, people improve the relative electrorheological effect of electrorheological elastomers by preparing different particles, changing the polymer matrix, improving the interface between particles and the matrix, etc., especially preparing isotropic electrorheological elastomers, improving The relative electrorheological effect of electrorheological elastomers has always been in the shear modulus in the direction perpendicular to the electric field, but it is difficult to improve the compressive modulus in the direction parallel to the electric field. The above shortcomings are difficult to meet in bridge construction, aerospace, Applied in the control shock absorption of precision instruments; adding conductive materials to electrorheological elastomers can improve the relative electrorheological effect in principle, but due to its high conductivity, it is easy to increase the risk of breakdown of electrorheological elastomers, and there has been no relevant research progress

Method used

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  • A high-performance giant electrorheological elastomer and its preparation and testing methods
  • A high-performance giant electrorheological elastomer and its preparation and testing methods
  • A high-performance giant electrorheological elastomer and its preparation and testing methods

Examples

Experimental program
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Effect test

preparation example Construction

[0054] A preparation method of a high-performance giant electrorheological elastomer, the raw material composition includes electrorheological particles, conductive metal particles, PDMS prepolymer, curing agent and silicone oil; including the following steps:

[0055] a. Quantitatively take the PDMS prepolymer and the curing agent into a mortar and grind for 5-10 minutes to obtain mixture 1; the curing agent is a silicon hydrogen crosslinking agent; and / or, the PDMS prepolymer is the same The use mass ratio of described curing agent is 10:1;

[0056] b. Quantitatively take the silicone oil and add it into the mortar and grind it with the mixture 1 for 15-20 minutes to obtain the mixture 2; the silicone oil is uncrosslinked polydimethylsiloxane, and / or, the The viscosity of the silicone oil is 0.1-100cst; and / or, the degree of polymerization of the silicone oil is 13-360;

[0057] c. Quantitatively take the electrorheological particles and the flake-shaped conductive metal pa...

experiment example 1

[0081] This embodiment discloses an electrorheological elastomer, comprising electrorheological particles, conductive metal particles, PDMS polymer and silicone oil; the electrorheological particles and the conductive metal particles constitute a double dispersed phase; the PDMS polymer and the Silicone oil constitutes a bicontinuous phase; the electrorheological particles and the conductive metal particles are dispersed in the bicontinuous phase.

[0082] The material of the conductive metal particles is silver; and / or, the shape of the conductive metal particles includes flakes; and / or, the particle size of the conductive metal particles is 1-10 μm.

[0083] The giant electrorheological elastomer includes 50wt% electrorheological particles, 24wt% PDMS polymer and 26wt% silicone oil.

[0084] The electrorheological particles are barium titanyl oxalate wrapped by urea.

[0085] The PDMS polymer is polymerized by a PDMS prepolymer and a curing agent; and / or, the PDMS prepolyme...

experiment example 2

[0103] This embodiment discloses an electrorheological elastomer, which is used to verify the optimal addition ratio of conductive metal particles, shape of metal particles, electrorheological activity and time stability. The electrorheological elastomer comprises electrorheological particles, conductive metal particles, PDMS polymer and silicone oil; the electrorheological particles and the conductive metal particles form a bidisperse phase; the PDMS polymer and the silicone oil form a bicontinuous phase ; the electrorheological particles and the conductive metal particles are dispersed in the bicontinuous phase.

[0104] The addition amount of the conductive metal particles is 0wt%, 0.5wt%, 1wt% and 10wt% of the mass sum of the mixture 2 and the electrorheological particles, the conductive metal particles are gold particles, and the rest are the same as the experimental example 1.

[0105] Such as Figure 4 As shown, when an electric field is applied to the elastomer, the p...

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Abstract

The present invention relates to the technical field of chemical industry, in particular to a high-performance giant electrorheological elastomer and its preparation and testing method, comprising electrorheological particles, conductive metal particles, PDMS polymer and silicone oil; electrorheological particles and conductive metal particles form a bidisperse phase; PDMS polymer and silicone oil constitute a bicontinuous phase; electrorheological particles and conductive metal particles are dispersed in the bicontinuous phase; the material of the conductive metal particles includes gold and silver; the shape of the conductive metal particles includes flakes; the particle size of the conductive metal particles 0.1‑100 μm. The present invention has the following advantages: the compressive modulus in the direction parallel to the electric field and the shear modulus in the direction perpendicular to the electric field are improved by adding conductive metal particles and the optimized addition amount, and at the same time, the problem of conductive breakdown is avoided. The urea-coated barium titanyl oxalate has higher relative electrorheological effect, fast response to external electric field, good time stability and good self-healing property.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a high-performance giant electrorheological elastomer and its preparation and testing methods. Background technique [0002] Electrorheological elastomer (BTRU) has many excellent properties, such as not easy to leak liquid, simple device structure design, good environmental adaptability, etc., which has attracted more and more attention of scientific researchers. Since the damping and stiffness characteristics of electrorheological elastomers can be controlled by electric field strength, they have broad application prospects in bridge construction, aerospace, and precision instrument control shock absorption, especially in the fields of artificial muscles and electric drives. Has important application value. [0003] The inventors of the present invention have discovered that the electrorheological elastomer has the following disadvantages: the relative electrorheo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04C08K3/08C08K9/04C08K5/098G01N3/08
CPCC08L83/04G01N3/08G01N2203/0019G01N2203/0298C08L2205/025C08K2201/001C08K3/08C08K9/04C08K5/098
Inventor 时权王丽娟温维佳薛厂张萌颖巫金波
Owner SHANGHAI UNIV
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