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A responsive material based on semi-interpenetrating polymer network and its application

A polymer and semi-interpenetrating technology, applied in the field of liquid crystal materials, can solve the problems of losing temperature response properties and limiting the scope of application

Active Publication Date: 2021-11-09
SHENZHEN GUOHUA OPTOELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But reversible temperature-responsive color-changing photonic coatings made of hydrogels and block copolymers require swelling solvents, which limits their application range.
To avoid the use of swelling solvents, temperature-responsive color-changing coatings can be obtained using cholesteric liquid crystal backbone polymers, however they lose their temperature-responsive properties after crosslinking by photopolymerization

Method used

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  • A responsive material based on semi-interpenetrating polymer network and its application
  • A responsive material based on semi-interpenetrating polymer network and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment provides a responsive material based on a semi-interpenetrating polymer network, which is prepared by the following steps:

[0027] (1) Weigh 77 parts by mass of liquid crystal elastomer and liquid crystal mixture to form a coating, the liquid crystal mixture includes 16 parts by mass of chiral polymerizable liquid crystal monomer RM-1, 5 parts by mass of achiral polymerizable liquid crystal monomer The photoinitiator of body RM-2, 1 mass part and the tensio-active agent of 1 mass part;

[0028] (2) The above-mentioned coating is coated on the polyimide glass substrate of rubbing using doctor blade coating, followed by UV polymerization (light intensity I=32mw / cm 2 , 10 minutes in a nitrogen atmosphere).

[0029] The structural formula of the liquid crystal elastomer used in this embodiment is that the structural formula of the liquid crystal elastomer is Chiral polymerizable liquid crystal monomer RM-1 is a left-handed liquid crystal monomer, and its...

Embodiment 2

[0032] This embodiment provides a patterned coating, prepared according to the following steps:

[0033] (1) the coating used in the present embodiment is the same as the coating composition of embodiment 1;

[0034] (2) The above-mentioned coating is coated on the rubbed polyimide glass substrate by flexographic printing process, and a photomask with a clover pattern is used to pass a 0.01mw / cm 2 The UV light intensity is irradiated, and the patterned area is surrounded by 2.7mw / cm 2 intensity of irradiation.

[0035] The pictures of the above patterned coatings taken in different temperature-time processes are as follows: figure 2 As shown, it can be seen from the figure that the surrounding area of ​​the clover pattern becomes visible at high temperature (65°C) and becomes invisible at lower temperature (28°C). Due to different polymerization conditions, the clover-patterned area does not shift to visible wavelengths, and when heated to 65 °C within 1.4 h, the surroundi...

Embodiment 3

[0037] This embodiment provides a temperature-responsive coating, which is prepared through the following steps. The raw materials used in this embodiment are the same as those in Embodiment 1:

[0038] (1) Weigh 80 parts by mass of liquid crystal elastomer and liquid crystal mixture to form a coating, the liquid crystal mixture includes 5 parts by mass of chiral polymerizable liquid crystal monomer RM-1, 11 parts by mass of achiral polymerizable liquid crystal monomer The photoinitiator of body RM-2, 2 mass parts and the tensio-active agent of 2 mass parts;

[0039] (2) The above-mentioned coating is coated on the polyimide glass substrate of rubbing using doctor blade coating, followed by UV polymerization (light intensity I=32mw / cm 2 , 10 minutes in a nitrogen atmosphere).

[0040] Observing the changes of the temperature-responsive coating of this embodiment in different temperature-time courses shows that the color of the temperature-responsive coating changes with tempe...

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Abstract

The invention discloses a responsive material based on a semi-interpenetrating polymer network, comprising a semi-interpenetrating polymer network formed by a liquid crystal elastomer and a cholesteric liquid crystal polymer network, the cholesteric liquid crystal polymer network consisting of A liquid crystal mixture comprising liquid crystal monomers is formed by polymerization. The liquid crystal monomers comprise one or more liquid crystal monomer compounds, at least one of which is a monofunctional liquid crystal monomer. In the semi-interpenetrating polymer network, the liquid crystal elastomer and the cholesteric liquid crystal polymer network can undergo a phase separation process with temperature changes, thereby achieving a reversible change in color. The responsive material does not need to be swollen by a solvent to change color, The required coating can be obtained by using conventional processes such as coating technology, and has a good application prospect in the fields of temperature-responsive liquid crystal devices, temperature-responsive coatings, anti-counterfeiting labels, and monitoring indications.

Description

technical field [0001] The invention relates to the field of liquid crystal materials, in particular to a responsive material based on a semi-interpenetrating polymer network and its application. Background technique [0002] Liquid crystal (LC) is a state of matter between a disordered liquid and a three-dimensionally ordered solid. Liquid crystal molecules can form ordered arrangements in one or two dimensions, so there are many liquid crystal phases, such as smectic phase (two-dimensional order) and Nematic phase (one-dimensional order). A special case of the nematic phase is the cholesteric phase, in which the distortion of the orientation of the liquid crystal molecules is induced by chiral molecules. Due to this distortion, the liquid crystal molecules form a periodic helical structure that can reflect light of a specific wavelength. The wavelength of the reflected light depends on the length required for the directors of the liquid crystal molecules to complete a 360...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/06C08L33/14C08F283/12C08F220/30C08F222/20C09D4/02C09D4/06C09D5/26C09D11/101C09K19/38
CPCC08F220/30C08F283/12C08L83/06C09D4/06C09D5/26C09D11/101C09K19/3833C09K19/3852C09K19/3857C09K2219/13C08L33/14C08F222/20
Inventor 奥古斯丁·卡尔迪克·杨·波尔阿尔伯特·斯凯宁周国富
Owner SHENZHEN GUOHUA OPTOELECTRONICS
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