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A smart composite material based on crystal photoinduced phase transition and its preparation method

A technology of composite materials and crystal materials, applied in the direction of coating, etc., can solve the problems of insufficient deformation and complex preparation process of optical-mechanical energy conversion materials, etc., and achieve the effect of simple preparation method, wide application range and easy availability of materials

Active Publication Date: 2019-07-19
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art, the present invention is committed to developing a new light-driven composite material, which uses the large volume change of the light-responsive crystal material to realize the light-driven function of the composite material as a whole, and provides a light-responsive crystal material. The preparation method of light-driven thin film materials with materials as the main functional body overcomes the defects of complex preparation process and insufficient deformation of existing light-mechanical energy conversion materials

Method used

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  • A smart composite material based on crystal photoinduced phase transition and its preparation method
  • A smart composite material based on crystal photoinduced phase transition and its preparation method
  • A smart composite material based on crystal photoinduced phase transition and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Rubbing Orientation of Polymer Substrates:

[0035] The low-density polyethylene film is polished with sandpaper to obtain a micro-groove structure. Due to the regular periodic groove structure, the low-density polyethylene film shows periodic light and dark changes under a polarizing microscope, such as figure 2 shown.

[0036] 2. Preparation of composite film:

[0037] Synthesize 4,4'-bis(undecyloxy)-3-methylazobenzene crystal, its structural formula is such as formula Ia, take an appropriate amount to prepare a 3wt% acetone solution, and coat it on a low-density polyethylene film , because the liquid crystal temperature of 4,4'-bis(undecyloxy)-3-methylazobenzene crystal is about 67°C, such as image 3 and Figure 4 As shown, it can be seen that the compound is in a crystalline state at room temperature. When heated to a melting point of 66°C, it is a nematic liquid crystal until the clearing point of 70°C, and then becomes an isotropic liquid; during cooling, ...

Embodiment 2

[0042] 1. The rubbing alignment operation of the polyimide substrate is the same as the operation process in Example 1.

[0043] 2. Preparation of composite film:

[0044] Synthesize 4,4'-bis(undecyloxy)-3-ethylazobenzene crystal, the structural formula is shown in formula Ib, take an appropriate amount of 3wt% tetrahydrofuran solution, and coat it on a low-density polyethylene film, During annealing, at the liquid crystal temperature of 4,4'-bis(undecyloxy)-3-ethylazobenzene crystal, other operations are the same as in Example 1.

[0045]

[0046] 3. Composite thin film light-driven phenomenon:

[0047] The light-driven phenomenon of the composite thin film is the same as in Example 1.

Embodiment 3

[0049] 1. The rubbing orientation operation of the low-density polyethylene substrate is the same as the operation process in Example 1.

[0050] 2. Preparation of composite film:

[0051] Synthesize 4,4'-bis(undecyloxy)-3-propyl azobenzene crystal, its structural formula is shown in formula Ic, take an appropriate amount to prepare a 3wt% tetrahydrofuran solution, and coat it on a low-density polyethylene film , above the melting point temperature of 4,4'-bis(undecyloxy)-3-propylazobenzene crystal during annealing, other operations are the same as in Example 1.

[0052]

[0053] 3. Composite thin film light-driven phenomenon:

[0054] The light-driven phenomenon of the composite thin film is the same as in Example 1.

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Abstract

The invention discloses an intelligent composite material based on crystal photo-induced phase transformation and a preparation method thereof. A polymer film is used as a flexible substrate, the surface of the flexible substrate is subjected to friction treatment to obtain a micro groove structure, the surface of the substrate is coated with a micromolecular photoresponse crystal material capable of generating photo-induced phase transformation, and annealing is carried out to obtain a photically driven composite film capable of converting optical energy into mechanical energy. After being cut, the composite film can generate specific deformation, such as bending, curling, spiraling and moving, under specific wavelength illumination, and the process is reversible. The preparation method is simple, and the material is easy to obtain, large in deformation, high in response speed, controllable, functional and wide in application range, can be used for a flexible environment such as muscles and joints of an artificial mechanical system and can also be applied to the field of micromechanical systems.

Description

technical field [0001] The present invention relates to a class of photoresponsive crystal materials, in particular to the photoinduced phase transition of small molecular photoresponsive crystal materials, which can be compounded with polymer materials by appropriate methods to obtain composite materials that can realize complex photoinduced deformation, which belongs to smart materials field. Background technique [0002] At present, the known light-driven materials, that is, photo-mechanical energy conversion materials, are mainly concentrated in the field of liquid crystal materials, such as liquid crystal elastomer materials, and the bending deformation of such materials is mainly realized by using the phase transition of liquid crystals. Since the liquid crystal is two-dimensional or one-dimensional ordered, its phase transition volume change is smaller than that of a three-dimensional ordered crystal material, which leads to a small degree of macroscopic deformation o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/06C08L23/06C08L79/08
CPCC08J5/18C08J7/065C08J2323/06C08J2379/08C08L2203/16C08L2207/066
Inventor 于海峰胡婧李晓王文忠
Owner PEKING UNIV
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