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Infrared photodeformable liquid crystal high-polymer nano composite material and preparation method thereof

A technology of nanocomposite materials and liquid crystal polymers, applied in liquid crystal materials, luminescent materials, chemical instruments and methods, etc.

Active Publication Date: 2011-01-12
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, at present, photodeformation can only be realized by absorbing ultraviolet light or visible light energy (200710038100.3, 200810032771.3, 200910045903.0)

Method used

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  • Infrared photodeformable liquid crystal high-polymer nano composite material and preparation method thereof
  • Infrared photodeformable liquid crystal high-polymer nano composite material and preparation method thereof
  • Infrared photodeformable liquid crystal high-polymer nano composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] This example illustrates the process of preparing liquid crystal polymer nanocomposites according to the in-situ polymerization molding method of the present invention. See figure 1 As shown, first A11AB6 and DA11AB are mixed in a molar ratio of 90:10, then 5% of the sum of moles of A11AB6 and DA11AB is added as a photoinitiator, and then 10% of the sum of the mass of A11AB6 and DA11AB as rare earth luminescent nanoparticles is added. After mixing evenly, it is melted and injected into a liquid crystal cell 6 made of two substrates 5, and a spacer material 2 with a certain diameter is placed between the two substrates 5 to keep a certain distance between the two substrates 5 to control the prepared liquid crystal polymer nanometer. The thickness of the composite material, the inner surface of the substrate 5 is directional rubbed, so that the mesogens are aligned along the rubbing direction, the rubbing direction 3 is shown in the figure, and then the heating platform 4...

Embodiment 2

[0047] This example illustrates the process of preparing liquid crystal polymer nanocomposites according to the in-situ polymerization molding method of the present invention. See figure 1 As shown, at first A9ABT and DA9ABT are molar ratio of 90:10, then add A9ABT and DA9ABT molar sum of 5% thermal initiator azobisisoheptanonitrile, then add A9ABT and DA9ABT mass sum of 10% Rare earth luminescent nanoparticles. After mixing evenly, it is melted and injected into a liquid crystal cell 6 made of two substrates 5, and a spacer material 2 with a certain diameter is placed between the two substrates 5 to keep a certain distance between the two substrates 5 to control the prepared liquid crystal polymer nanometer. The thickness of the composite material, the inner surface of the substrate 5 is directional rubbed, in order to make the mesogens align along the rubbing direction, the rubbing direction 3 is shown in the figure, and then the heating platform 4 is used to control the re...

Embodiment 3

[0049] This example demonstrates the control of photodeformation of liquid crystal polymer nanocomposites. please see figure 2 As shown, the liquid crystal polymer nanocomposite material 8 obtained in Example 1 or Example 2 is placed on the substrate 7, and then the starting wavelength is 980nm and the power is 3W vertically above the liquid crystal polymer nanocomposite material 8. At this time, it can be observed that the liquid crystal polymer nanocomposite material 8 bends toward the light source along the rubbing direction 9 to form a deformed liquid crystal polymer nanocomposite material 11 . After the irradiation of the laser 10 is stopped, it can be observed that the deformed liquid crystal polymer nanocomposite material 11 has changed into the liquid crystal polymer material 12 returning to the initial state. This process can be repeated for many times, and the liquid crystal polymer material 8 There is no obvious fatigue in itself.

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Abstract

The invention belongs to the technical field of nano composite materials, and particularly relates to an infrared photodeformable liquid crystal high-polymer nano composite material and a preparation method thereof. The composite material comprises liquid crystal high polymers containing azobenzene and derivatives thereof, and rare-earth light-emitting nano particles, wherein the liquid crystal high polymers are prepared from polymer monomers and a cross-linking agent through photopolymerization or thermal polymerization in the presence of a photoinitiator or a thermal initiator. The composite material can realize photoinduced deformation under the irradiation of infrared light, and can restore after stopping irradiation. The liquid crystal high-polymer nano composite material can be used in the fields of micro actuators, artificial muscles, biochips and the like.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials, and in particular relates to a photodeformable liquid crystal polymer nanocomposite material and a preparation method thereof. Background technique [0002] Photodeformable liquid crystal polymer material is a kind of intelligent deformation material controlled by light. The specific performance is: when the material is irradiated by light (usually ultraviolet light and visible light), the photoisomerization reaction occurs inside the material to cause the size of the corresponding part to change. Change, and transmit this microscopic change to the molecular chain through the synergy between the liquid crystal molecules and the polymer chain segments, so that the state of the molecular chain changes significantly, and the material shows photodeformation macroscopically. When the light is stopped, the material undergoes a reversible photoisomerization reaction, the shape of the mol...

Claims

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Application Information

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IPC IPC(8): C08F220/36C08F2/44C08L33/14C09K19/38C09K11/85
Inventor 俞燕蕾李富友吴伟姚立明尹若元杨天赦
Owner FUDAN UNIV
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