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High-dielectric elastic composite material as well as preparation method and application thereof

An elastic composite material, high dielectric technology, applied in chemical instruments and methods, electrospinning, rayon manufacturing, etc., can solve problems such as difficulty in achieving mechanical flexibility, and achieve the effect of optimizing dielectric properties

Active Publication Date: 2021-06-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditionally commonly used dielectric composite materials have an inverted coupling relationship between dielectric properties and mechanical properties, making it difficult to optimize the dielectric properties of materials while maintaining excellent mechanical flexibility

Method used

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  • High-dielectric elastic composite material as well as preparation method and application thereof
  • High-dielectric elastic composite material as well as preparation method and application thereof
  • High-dielectric elastic composite material as well as preparation method and application thereof

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preparation example Construction

[0077] 2) The in-situ composite preparation method of the present invention realizes the self-assembly design of various polymer materials and inorganic nanomaterials. This process provides the basis for the orderly design of microstructures, and at the same time realizes the large-area preparation of composite films.

[0078] 3) The in-situ composite process of the present invention overcomes the difficulty of dispersing inorganic nanomaterials in high-viscosity polymer materials, avoids the agglomeration of nanomaterials, and can regulate the distribution of nanomaterials in an orderly manner.

[0079] 4) The present invention has prepared the elastic composite film that the ceramic nanomaterial is distributed in three-dimensional network structure in the elastic matrix, and the aggregation network structure of nanoparticles in the polymer enhances its dipole polarization effect under the electric field, which is beneficial to improve the composite material the dielectric con...

Embodiment 1

[0095] In this embodiment, a rapid non-equilibrium preparation method of in-situ compounding is adopted, and by means of a high-voltage electric field, the in-situ assembly of active nanomaterials in the process of forming polymer fibers is realized to form a continuous network. Combined with the hot pressing process, the stacked and assembled heterogeneous films are prepared into a dense and integrated elastic composite film, which realizes uniform and stable preparation of elastic composite materials.

[0096] Specific steps are as follows:

[0097] (1) Adopting hexafluoroisopropanol as solvent, the preparation mass fraction is 4% polyurethane (TPU, BASF 1180A) solution was magnetically stirred at room temperature for 6 hours to obtain a clear and transparent solution.

[0098] (2) Disperse the dried barium titanate (BTO) nanoparticles (nanoparticle diameter is 300nm) in absolute ethanol solution, the concentration of BTO is 0.1g / ml, initially use magnetic stirring for 10m...

Embodiment 2

[0109] Fabrication and testing of flexible strain sensors based on elastic composite materials:

[0110] (1) An elastic conductive film with AgNW uniformly distributed in the TPU fiber network was prepared by in-situ composite method. On the double injection electrospinning instrument, one end spins the TPU solution, the spinning voltage is 10kV, the injection speed is 0.2mm / min, and the spinning distance is 17cm; the other end carries out synchronous electrostatic spraying of the AgNW dispersion, and the spraying voltage is 12kV , injection speed 1.0mm / min, spraying distance 14cm. The aluminum foil on the roller was used to receive the TPU fiber and the BTO nanoparticle synchronously, and the receiving end was connected with a negative pressure of -2kV to prepare a TPU-AgNW conductive composite film.

[0111] (2) Transfer the TPU-AgNW conductive composite film to the polydimethylsiloxane (PDMS) film substrate, and use a laser cutting machine to cut the conductive film into a...

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Abstract

The invention discloses a high-dielectric elastic composite material as well as a preparation method and application thereof. The composite material comprises a nano ceramic-based elastic composite film and a nano conductive material-based elastic composite film which are sequentially laminated and distributed. The nano ceramic-based elastic composite film comprises a ceramic nano-material and an elastic polymer matrix material, wherein the ceramic nano-material is distributed in an elastic polymer matrix in a three-dimensional network structure. The nano conductive material-based elastic composite film comprises a conductive nano material and an elastic polymer matrix material. By constructing a three-dimensional network structure and a multi-stage interface structure of a heterogeneous film, the coupling effect of interface polarization and internal electric field regulation of the elastic composite film under an electric field is realized, so that the dielectric property of the composite material is remarkably improved. Meanwhile, the mechanical property of the composite material is optimized through the microstructure design.

Description

technical field [0001] The invention belongs to the technical field of flexible and stretchable electronic devices, and in particular relates to a high dielectric, low loss and low modulus elastic dielectric composite material applied to a flexible strain sensor and its preparation method and application. Background technique [0002] As a core component of information collection and intelligent control systems, flexible sensors can collect, process and feed back a variety of information. They have broad application prospects in the fields of intelligent robots, bionic prostheses, aerospace and health monitoring. [0003] Traditional mechanical sensors based on metal and semiconductor materials have major challenges in terms of deformability and sensitivity, and cannot perform real-time detection and feedback of the composite stress and strain on mechanical equipment or flexible substrates. Low-dimensional flexible mechanical sensors have many advantages such as free deforma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/00B32B9/04B32B27/02B32B27/30B32B27/32B32B27/40B32B33/00B32B37/06B32B37/10D01D5/00D01F1/10D01F6/70D04H1/728D06M17/00G01B7/16G01L1/14
CPCB32B9/005B32B9/04B32B9/047B32B5/028B32B33/00B32B37/06B32B37/10D06M17/00D01F6/70D01F1/10G01B7/22G01L1/142D01D5/0015D01D5/003D04H1/728B32B2262/0292B32B2262/023B32B2262/0253B32B2255/02B32B2255/20B32B2255/205B32B2307/51
Inventor 沈洋范友军南策文
Owner TSINGHUA UNIV
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