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Light-driven composite with double-layer-film structure and preparation method of light-driven composite

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 complex preparation process and poor film-forming property of light-driven materials, and achieve simple preparation operation, short preparation cycle, and applicable wide range of effects

Active Publication Date: 2016-04-20
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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  • Light-driven composite with double-layer-film structure and preparation method of light-driven composite
  • Light-driven composite with double-layer-film structure and preparation method of light-driven composite
  • Light-driven composite with double-layer-film structure and preparation method of light-driven composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]1. Rubbing orientation of polyimide substrate:

[0035] Select K-125 type polyimide film, and use sandpaper to lightly polish along one direction to form parallel micro-grooves on the surface of polyimide, 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 2wt%, evenly drop a layer on the surface of the rubbed polyimide film, and let it dry naturally at room temperature. The films were then annealed overnight at 150°C in a vacuum oven. After annealing, the photoresponsive groups have been oriented. Under a polarizing microscope, the light and shade changes of the field of view can be observed with the change of angle, such as image 3 shown.

[0038]

[0039] 3. Optical drive phenomenon:

[0040] Take the above-mentioned annealed film and cut it into a spline of a certain size, with the liquid crystal polymer ...

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] Take an appropriate amount of polymer 2, prepare a tetrahydrofuran solution with a concentration of 2wt%, evenly drop a layer on the surface of the polyester film after rubbing, and let it dry naturally at room temperature. The films were then annealed overnight at 80°C in a vacuum oven. After annealing, the photoresponsive groups are oriented, and under a polarizing microscope, the light and dark changes of the field of view can be observed as the angle changes. Changing the intensity of ultraviolet light irradiation, the degree of bending of the film will change, among which (L 0 and L are the original length and the length after bending of the film, respectively).

[0045]

[0046] 3. The optical drive phenomenon is the same as that in Embodiment 1.

Embodiment 3

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

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

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

[0051]

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

[0053] Take an appropriate amount of compound 2+3, prepare a tetrahydrofuran solution with a concentration of 2wt%, evenly drop a layer on the surface of the rubbed polyvinyl alcohol film, and let it dry naturally at room temperature. The films were then annealed overnight in a vacuum oven at liquid crystal temperatures. After annealing, the liquid crystal is oriented, and under ...

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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 thin film, in particular to a light-driven composite thin 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 direct conversion between light energy and mechanical energy by using chromophore materials with light-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 photoresponsive properties. The mechanism of the photoresponse of azobenzene molecules is that it can change from an energy-stable trans state to an unstable cis state under a certain wavelength of light, which is a single-molecule reaction. [0003] The research on light-driv...

Claims

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Application Information

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Patent Type & Authority Applications(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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