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Preparation method of reversible photoinduced deformation liquid crystal high polymer and carbon nano tube composite thin film

A carbon nanotube composite and carbon nanotube film technology, which is applied in the field of preparation of liquid crystal polymer and carbon nanotube composite film, can solve the problems of low material sensitivity and stability, difficult orientation of liquid crystal polymer, etc. Effects of defects and electrostatic aggregation, improved mechanical properties, simple preparation

Inactive Publication Date: 2012-08-01
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is still very difficult to control and improve the orientation of liquid crystal polymers, because the carbon nanotubes are randomly distributed, and because of the indirect light drive, the sensitivity and stability of the material are low, and other mechanical and electrical properties need to be further improved.

Method used

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  • Preparation method of reversible photoinduced deformation liquid crystal high polymer and carbon nano tube composite thin film
  • Preparation method of reversible photoinduced deformation liquid crystal high polymer and carbon nano tube composite thin film
  • Preparation method of reversible photoinduced deformation liquid crystal high polymer and carbon nano tube composite thin film

Examples

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specific example 1

[0037] Highly oriented carbon nanotube films were prepared by dry spinning and fixed on glass substrates. The two glass substrates are respectively covered with two layers of carbon nanotube films, and the glass sheets are fixed in parallel with an interval of 30 microns to make a liquid crystal cell. Mix the two monomers A11AB6, A9Bz9 and the crosslinking agent C9A in a molar ratio of 1:1:3 and a photoinitiator with a molar percentage of 1%, heat it to 90 degrees Celsius, melt and inject it into the liquid crystal cell, and the liquid crystal material in an amorphous state. Cool down to 77 degrees Celsius at a rate of 0.1 degrees Celsius / second, and the liquid crystal is in the nematic phase. Then keep the temperature at 77 degrees Celsius, filter the high-pressure mercury lamp light source to obtain monochromatic light with a wavelength of 547 nanometers, and irradiate for 2 hours to carry out the polymerization reaction. Then cool down to room temperature, open the liquid...

specific example 2

[0039] Highly oriented carbon nanotube films were prepared by dry spinning and fixed on glass substrates. Two glass sheets respectively covered with a layer of carbon nanotube film are fixed in parallel with an interval of 20 microns to make a liquid crystal cell. Mix the two monomers A11AB6, A9Bz9 and the crosslinking agent C9A in a molar ratio of 1:1:3 and a photoinitiator with a molar percentage of 1%, heat it to 89 degrees Celsius, melt and inject it into the liquid crystal cell, and the liquid crystal material in an amorphous state. Cool down to 76 degrees Celsius at a rate of 0.1 degrees Celsius / second, and the liquid crystal is in the nematic phase. Then keep the temperature at 76 degrees Celsius, filter the high-pressure mercury lamp light source to obtain monochromatic light with a wavelength of 547 nanometers, and irradiate for 2 hours to carry out the polymerization reaction. Then cool down to room temperature, open the liquid crystal cell, and peel off the compos...

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Abstract

The invention belongs to the technical field of an intelligent material and particularly relates to a reversible photoinduced deformation liquid crystal high polymer and carbon nano tube composite thin film and a preparation method thereof. A liquid crystal high polymer in the composite thin film is a cross-linked type liquid crystal elastic body containing a photosensitive azobenzene liquid crystal element; and a carbon nano tube is a highly and sequentially oriented carbon nano tube thin film. In the composite thin film, a carbon nano tube orienting structure induces the liquid crystal element to be oriented along the axial direction of the carbon nano tube; and other orienting layers are not needed. When the prepared composite thin film is in ultraviolet illumination, the composite thin film is bent towards lights and can be recovered to the original state when the composite thin film is irradiated by visible lights. Reversible deformation generated by alternatively illuminating the composite thin film by ultraviolet lights and visible lights can be repeated for hundreds of times and has no obvious attenuation and fatigue. Moreover, the introduction of the carbon nano tube greatly enhances the mechanical performance of the material, and the material has excellent electric performance.

Description

technical field [0001] The invention belongs to the technical field of intelligent materials, and in particular relates to a preparation method of a liquid crystal polymer and carbon nanotube composite film. Background technique [0002] Photodeformable polymer materials have made great progress in recent years due to their great application prospects in the fields of artificial muscles, optical drives, and micro-optomechanical systems. Among them, the cross-linked liquid crystal polymer containing photosensitive groups such as azobenzene is one of the most studied materials, and the deformation of the material is realized through the photoisomerization of the azobenzene group. By introducing cross-linked liquid crystal polymer materials, people have realized many light-driven flexible devices, including plastic motors, inchworm walkers, flexible micro-robots, high-frequency oscillators, artificial fibers, etc. In the above applications, the key is to control the bending di...

Claims

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Application Information

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IPC IPC(8): B32B17/06B32B9/04G02F1/1337C03C17/22C08F2/48
Inventor 彭慧胜俞燕蕾孙雪梅王威
Owner FUDAN UNIV
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