Photoresponse block liquid crystal polymer with crosslinkable property and preparation method thereof

A liquid crystal polymer and photoresponsive technology, applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve the problems of inapplicable preparation of liquid crystal elastomers, limited film size, etc.

Active Publication Date: 2011-01-19
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the former needs to be polymerized in a liquid crystal cell and thus the size of the prepared film is limited, while the latter is not suitable for the preparation of liquid crystal elastomers other than polysiloxanes.

Method used

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  • Photoresponse block liquid crystal polymer with crosslinkable property and preparation method thereof
  • Photoresponse block liquid crystal polymer with crosslinkable property and preparation method thereof
  • Photoresponse block liquid crystal polymer with crosslinkable property and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This example illustrates the synthesis method of dithiobenzoic acid macromolecular reagents. First, dissolve 1.0 g of polyethylene oxide maleate and 1.6 g of dithiobenzoic acid in 10 ml of CCl4 solution in a Schlenk reaction flask. Block the polymerization reaction for 48 h. After the reaction, it was precipitated three times in diethyl ether, and dried under vacuum at 40°C to obtain 1.2 g of RAFT reagent.

Embodiment 2

[0048] This example illustrates the synthesis method of dithionaphthoic acid macromolecular reagents. First, in the Schlenk reaction flask, 1.0 g of polyethylene oxide maleate and 2.0 g of dithionaphthoic acid were dissolved in 12 ml of CCl4 solution. Block the polymerization reaction for 48 h. After the reaction, it was precipitated three times in ether, and dried in vacuum at 40°C to obtain 1.0 g of RAFT reagent.

Embodiment 3

[0050] This example illustrates the synthesis method of dithiophenanthrene acid macromolecular reagents. First, in the Schlenk reaction flask, 1.0 g polyethylene oxide maleate and 2.5 g dithiophenanthrene acid were dissolved in 15 ml of CCl4 solution, after 3 cycles of vacuuming and argon, finally at 65 ° C Block the polymerization reaction for 48 h. After the reaction, it was precipitated three times in diethyl ether, and dried under vacuum at 40°C to obtain 0.7 g of RAFT reagent.

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Abstract

The invention provides a photoresponse block liquid crystal polymer with crosslinkable property and a preparation method thereof. The preparation method of the photoresponse block liquid crystal polymer is not limited by the dimension of a liquid crystal box, thereby being simpler and easier to operate on the aspect of the processing forming of the photoresponse block liquid crystal polymer; and in addition, the invention is not only beneficial to the preparation of large-size membranous materials, but also easy to realize the composite processing with flexible membranes, i.e. polyethylene membranes and the like, greatly enhances the mechanical property of the materials and is beneficial to the development of the photoresponse block liquid crystal polymer as an all-optical driving flexible device.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal materials, and in particular relates to a photoresponsive block liquid crystal polymer with crosslinkable properties and a preparation method thereof. Background technique [0002] Light-responsive liquid crystal polymers are usually formed by introducing some chromophores with photoisomerization function, such as azo, 1,2-stilbene, benzospiropyran, and fulginic anhydride into the liquid crystal polymer network. . This kind of polymer, such as azobenzene liquid crystal polymer, under the action of light of appropriate wavelength, its internal azo group undergoes reversible photo-induced cis-trans isomerization, and causes a change in the ordered structure of the liquid crystal system, thereby making the polymerization Significant microscopic or macroscopic changes can occur in the object network, and photoresponse characteristics such as one-dimensional, two-dimensional shrinkage, and even...

Claims

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Application Information

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IPC IPC(8): C08F293/00C08G65/334C08J3/24C08K5/17C08J5/18C08J7/12C08L53/00C09K19/38
Inventor 俞燕蕾李晓英冯泽颜曾李阳
Owner FUDAN UNIV
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