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Ultraviolet light-driven molecular crystal-polymer composite film material and preparation method thereof

A polymer film and composite film technology, applied in the field of ultraviolet light-driven molecular crystal-polymer composite film material and its preparation, can solve the problems of fragility, low deformation accuracy, small deformation amount, etc., and achieves simple preparation, physical and chemical Stable properties and low cost effects

Active Publication Date: 2018-08-10
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Among the two types of materials, the azobenzene polymer liquid crystal film has the advantages of flexibility, increased responsiveness, high energy conversion rate, and polarization selectivity, but it is difficult to design and synthesize, and the deformation speed is slow and the deformation accuracy is low. , The physical and chemical properties of the surface change with the light; molecular crystals have the characteristics of fast deformation and high precision, but their deformation is small, and there is a contradiction between deformation and size (if you want a large deformation, the crystal size must be small), fragile, Poor fatigue resistance, the UV light source used below 260nm is expensive, low power, and decays quickly in the air
In addition, these two materials also have the following disadvantages: the bending direction is affected by the direction of the light source, which will cause inconvenience in design under certain application requirements; the photoactive groups are exposed on the surface of the material, which is easy to deteriorate and fail

Method used

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  • Ultraviolet light-driven molecular crystal-polymer composite film material and preparation method thereof
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  • Ultraviolet light-driven molecular crystal-polymer composite film material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0063] In the first step, about 50 mg of N-αnaphthyl-2-hydroxyl-1-naphthaldimine (HNNA), about 15 mL of cyclohexane, about 30 mL of ethanol and about 7.5 g of ethylene glycol were mixed to prepare a solution. Separately, an aqueous polyvinyl alcohol solution of about 30 mg / mL (dissolved at about 90° C. and then cooled to room temperature) was prepared.

[0064] In the second step, several 75mm×25mm glass slides are placed on a level-adjusted heating platform, and preheated to about 40°C. Then drop about 0.5mL of the HNNA mixed solution on each slide to make it cover the whole slide, and control the ambient temperature to about 25°C and the humidity to 2-3%RH.

[0065] In the third step, after the solvent evaporates, a mixture of yellow nanocrystals and ethylene glycol appears on the glass slide, which is washed and collected with deionized water, and the collected mixed liquid is centrifuged at a speed of about 4500 rpm for about 40 minute. Skim off the supernatant, re-add a...

Embodiment 2

[0074] Compared with Example 1, the difference of this example is that the collected HNNA nanocrystals and ethylene glycol mixture are purified by dialysis, and 100 mL of washing liquid is injected into a dialysis bag, which is placed in a deionized In the water, the water was changed every 24 hours, and the washing solution was taken out after 5 days to obtain the HNNA nanocrystal aqueous dispersion. In the dispersion obtained by this method, the nanocrystals are ball-rod mixtures.

Embodiment 3

[0076] Compared with Example 1, the difference of this example is that a saturated ethanol solution of HNNA was used to wash the HNNA nanocrystals, and the HNNA nanorods were obtained by filtration or centrifugation.

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Abstract

The invention discloses an ultraviolet light-driven molecular crystal-polymer composite film material and a preparation method thereof. The composite thin film material includes: a polymer thin film, and nanocrystals of organic dye molecules distributed in the thin film. Structured organic dye molecules. Preferably, the organic dye molecular nanocrystals form an array structure in a closely arranged manner. The preparation method of the composite material includes: uniformly mixing the organic dye molecular nanocrystals and the polymer in a solvent, spreading them on the substrate, allowing the organic dye molecular nanocrystals to self-assemble, and volatilizing the solvent, so as to obtain the composite material. film material. The composite film material of the invention has the characteristics of large size, large deformation, good flexibility, fast light response speed, simple preparation, low cost, stable physical and chemical properties, deformation direction not affected by light direction, and the like.

Description

technical field [0001] The invention relates to a material for realizing the direct conversion of light energy to mechanical energy, in particular to an ultraviolet light-driven molecular crystal-polymer composite thin film material and a preparation method thereof. Background technique [0002] At present, materials that can convert ultraviolet energy into mechanical energy, or produce deformation responses to ultraviolet energy, mainly include organic dye molecular crystals and azobenzene-containing polymer liquid crystals. The principle is to take advantage of the high energy characteristics of ultraviolet photons, which can trigger reversible chemical reactions of certain photoactive groups. [0003] Azobenzene-containing polymer liquid crystals, whose mesogens are long rod-shaped molecules containing azo groups, are arranged in a nematic phase at room temperature. Under the irradiation of ultraviolet light, part of the liquid crystal molecules on the surface of the fil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08K5/17C08K5/053C08J5/18
Inventor 陈韦蓝天胡颖
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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