A light-driven composite material with a double-layer film structure and its preparation method

A composite material and light-driven technology, which is applied in the direction of liquid crystal materials, chemical instruments and methods, coatings, etc., can solve the problems of poor film-forming property and complicated preparation process of light-driven materials, and achieve short preparation cycle, simple preparation operation, and applicable wide range of effects

Active Publication Date: 2017-12-29
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a simple light-driven composite material with a double-layer film structure and its preparation method, so as to solve the problems of poor film-forming properties and complex preparation process of light-driven materials currently prepared and the need for chemical cross-linking

Method used

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  • A light-driven composite material with a double-layer film structure and its preparation method
  • A light-driven composite material with a double-layer film structure and its preparation method
  • A light-driven composite material with a double-layer film structure and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. The rubbing orientation of the polyimide substrate:

[0035] Select K-125 type polyimide film, and lightly sand it in one direction with sandpaper to form parallel micro-grooves on the polyimide surface, such as figure 2 shown.

[0036] 2. Preparation of liquid crystal composite film:

[0037] Take an appropriate amount of liquid crystal polymer 1, prepare a tetrahydrofuran solution with a concentration of 2 wt%, drop a layer evenly on the surface of the rubbed polyimide film, and dry it naturally at room temperature. The films were then annealed overnight at 150 degrees Celsius in a vacuum oven. After annealing, the photo-responsive groups are oriented. Under the polarizing microscope, the light and dark changes in the field of view can be observed with the change of angle, such as image 3 shown.

[0038]

[0039] 3. Optical drive phenomenon:

[0040] The above annealed film is taken and cut into splines of a certain size, with the liquid crystal polymer fac...

Embodiment 2

[0042] 1. The rubbing orientation of the polyester film substrate is the same as the rubbing of the polyimide film in Example 1.

[0043] 2. Preparation of composite film:

[0044] An appropriate amount of polymer 2 was taken to prepare a tetrahydrofuran solution with a concentration of 2 wt %, a layer was evenly dropped on the surface of the rubbed polyester film, and it was naturally dried at room temperature. The films were then annealed overnight at 80 degrees Celsius in a vacuum oven. After annealing, the photo-responsive groups were oriented, and under a polarizing microscope, the light and dark changes in the field of view could be observed with the change of the angle. By changing the intensity of the ultraviolet light, the degree of bending of the film will change, among which (L 0 and L are the original and bent lengths of the film, respectively).

[0045]

[0046] 3. The phenomenon of light driving is the same as that of Embodiment 1.

Embodiment 3

[0048] 1. The rubbing orientation of the polyvinyl alcohol substrate is the same as the rubbing of the polyimide film in Example 1.

[0049] 2. Preparation of complex 2+3:

[0050] Compounds 2 and 3 were dissolved in tetrahydrofuran solution respectively to form a solution. The two solutions were mixed according to the ratio of pyridine group and iodine atom at 1:1, stirred at room temperature, and after the solvent was evaporated to dryness, the obtained solid was vacuum-dried in a vacuum oven at room temperature to obtain compound 2+3.

[0051]

[0052] 3. Preparation of liquid crystal composite film:

[0053] An appropriate amount of compound 2+3 was taken to prepare a tetrahydrofuran solution with a concentration of 2wt%, a layer was evenly dropped on the surface of the rubbed polyvinyl alcohol film, and it was naturally dried at room temperature. The films were then annealed overnight at the liquid crystal temperature in a vacuum oven. After annealing, the liquid cr...

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Abstract

The invention discloses a light-driven composite with a double-layer-film structure and a preparation method of the light-driven composite. A composite thin film with the light-driven characteristic is obtained by coating the surface of a rubbed base plate with a light responsiveness material after surface grinding with an industrially-produced polymeric film with a base plate material. The reversible photodeformation phenomenon can happen to the composite thin film under illumination of a certain wavelength, luminous energy is directly converted into mechanical energy, and then light-driven devices can be obtained through simple design. The light-driven composite is easy and rapid to prepare, raw materials of the base plate are easy to obtain, large-area preparation can be conducted, the application range is wide, and the light-driven composite has potential application prospects in the fields of artificial muscle, microfluid control, new energy, energy conversion, devices and the like.

Description

technical field [0001] The invention relates to a light-driven composite film, in particular to a light-driven composite film with a double-layer film structure and a preparation method thereof, belonging to the field of intelligent material technology and related devices. Background technique [0002] As a cheap, easy-to-obtain, clean and controllable energy source, light energy can realize the direct conversion between light energy and mechanical energy by using chromophore materials with photo-responsive properties, and can prepare light-driven devices that do not require electrical energy. Cis-trans isomerizable azobenzene molecules and photocrosslinkable cinnamate are typical molecules with light-responsive properties. The mechanism of the photoresponse of azobenzene molecule is that it can change from the energy-stable trans state to the unstable cis state under the illumination of a certain wavelength, which is a single-molecule reaction. [0003] The research on lig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/06B32B3/28C09K19/54B32B37/02B32B37/06
CPCB32B3/28B32B27/06B32B37/02B32B37/06B32B2250/02B32B2255/10B32B2255/24B32B2379/08B32B2457/00C09K19/542
Inventor 于海峰李晓马树灯王文忠
Owner PEKING UNIV
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