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Flexible film with light transmittance capable of being regulated and controlled through shear strain and preparation method of flexible film

A flexible film and capability technology, applied in the field of windows and their preparation, can solve problems such as excessively fast materials, increased flexibility of mechanical systems, and limited application occasions

Active Publication Date: 2021-08-31
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such optical functional materials controlled by stretching need to adjust the transmittance under large stretching strain (usually >30%), which leads to a series of problems caused by large stretching strain.
For example, repeated stretching and recovery under large tensile strains are easy to cause material fatigue too quickly; in addition, large tensile strains increase the flexibility requirements of the corresponding mechanical systems, which limits the application
Therefore, the mechanical force-responsive optical functional materials in the prior art increase the difficulty of using such materials in large areas due to their large tensile strain.

Method used

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  • Flexible film with light transmittance capable of being regulated and controlled through shear strain and preparation method of flexible film
  • Flexible film with light transmittance capable of being regulated and controlled through shear strain and preparation method of flexible film
  • Flexible film with light transmittance capable of being regulated and controlled through shear strain and preparation method of flexible film

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preparation example Construction

[0080] In another embodiment, the present invention also discloses a method for preparing the flexible film, comprising:

[0081] One-dimensional magnetic nanochains were prepared by using a magnetic assembly method, and then the nanochains were oriented distributed in a polyacrylamide (PAM) precursor solution under the assistance of a magnetic field, and the nanochain / polyacrylamide composite flexible film was obtained after ultraviolet curing.

[0082] In another embodiment, the present invention also discloses a method for preparing the flexible film, comprising:

[0083] The first step, the preparation of magnetic nanochains:

[0084] The superparamagnetic nanoparticles were dispersed in the ethanol / ammonia water mixed solution, and tetraethyl orthosilicate (TEOS) was added dropwise to the solution to hydrolyze and deposit SiO on the surface of the magnetic particles. 2 Coating layer; by applying a magnetic field, the nanoparticles are aligned under the action of the magn...

Embodiment 1

[0098] Embodiment 1: A method for preparing a flexible film with controllable light transmission under shear strain, specifically comprising the following steps:

[0099] Ⅰ. Preparation of magnetic field-assisted nanochains: 10 mg Fe 3 o 4 Nanoparticles were dispersed in 50mL of ammonia water-ethanol mixed solution (10:1), stirred by electric motor at 600r / min for 10-15 minutes to disperse evenly; added TEOS drop by drop, continued to stir at 600r / min for 12 minutes, then transferred to In a beaker; place it in a 100Oe magnetic field for 10s, then keep it standing still for 15min, collect the precipitate, wash it repeatedly with alcohol and water for 3 times, and dry it in a vacuum oven at 60°C for 12h;

[0100] Ⅱ. Configuration solution: 3.0~5.0g of basic components of PAM precursor solution, 2.8mg of curing agent (N, N'-methylenebisacrylamide (MBAA)), 132mg of photoinitiator 2-hydroxy-2-methyl -1-Acetone (HMPP) is dispersed in 10mL water and mixed uniformly to obtain an aq...

Embodiment 2

[0106] The steps are the same as in Example 1, except that the magnetic field strength in step I needs to be changed to 200Oe, and the holding time is changed to 5s.

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Abstract

According to the flexible film with the light transmittance capable of being regulated and controlled through shear strain, the flexible film is a nano chain-gel composite flexible film, and the nano chain-gel composite flexible film is obtained by fixing a one-dimensional nano chain in a flexible gel matrix in a certain orientation direction through a magnetic field; the nano chain comprises superparamagnetic nano particles and belongs to a stable one-dimensional magnetic nano chain with a core-shell structure; the light transmission capability of the flexible film can be regulated and controlled by applying shear strain, and when the shear strain is removed, the light transmission capability of the flexible film is recovered to the light transmission capability without the shear strain along with the return of the orientation of the nano chain; in addition, the shear strain is small strain which is far less than the traditional tensile strain which is at least 30% or above. According to the flexible film, the optical functional material of which the light transmission capability is adjusted through small strain, the corresponding window and the preparation method are realized.

Description

technical field [0001] The invention relates to flexible film technology, in particular to a flexible film whose light transmission ability can be adjusted through shear strain, a corresponding window and a preparation method thereof. Background technique [0002] Materials with adjustable light transmission ability, as a new type of optical functional material, have broad application prospects in the fields of building energy saving, advertising decoration, commodity anti-counterfeiting, and privacy protection. The control methods of this new type of optical functional materials mainly include electric field, magnetic field, light, temperature, humidity, mechanical force, etc. Among them, the research on electrical and thermal responsive optical functional materials is more extensive and has been successfully applied in many fields. However, in the prior art, due to the complex preparation process, high cost, and insufficient performance stability of such electrical and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01C08J5/18C08L33/26E06B3/67
CPCG02F1/0128C08J5/18E06B3/6722C08J2333/26
Inventor 卢学刚杨森张垠李佳宁姚康康周超
Owner XI AN JIAOTONG UNIV
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