A preparation method of electronically controlled smart film based on liquid crystal/epoxy-thiol polymer composite material

A composite material and polymer technology, which is applied in the field of preparation of electronically controlled smart films based on liquid crystal/epoxy-thiol polymer composite materials, can solve the problems of unfavorable PDLC production efficiency, high temperature, and long time for complete curing , to achieve the effects of improving practical value, improving production efficiency, and making the preparation process simple and operable

Active Publication Date: 2021-06-22
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the curing of epoxy and amine requires a very high temperature, and it takes a long time to fully cure, which is not conducive to improving the production efficiency of PDLC preparation

Method used

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  • A preparation method of electronically controlled smart film based on liquid crystal/epoxy-thiol polymer composite material
  • A preparation method of electronically controlled smart film based on liquid crystal/epoxy-thiol polymer composite material
  • A preparation method of electronically controlled smart film based on liquid crystal/epoxy-thiol polymer composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]Mix NDGA / PGDE / Capcure 3800 / E8 / DMP-30 according to the mass fraction ratio in Table 1. After fully stirring evenly, pour it into a liquid crystal cell made of two pieces of conductive glass coated with indium tin oxide , the thickness of the liquid crystal cell is controlled to 20.0um. Afterwards, the sample was placed on a hot stage and cured at 333.15K for 2 hours. After the thermally polymerized monomer was cured, an electronically controlled smart film based on liquid crystal / epoxy-thiol polymer composites could be prepared.

[0041] The composition of sample in the embodiment 1-3 of table 1

[0042]

[0043] Measure the electro-optical performance curve of the PDLC film prepared above with a liquid crystal comprehensive parameter tester, such as figure 2 shown. The polymer network of PDLC was observed with a scanning electron microscope (SEM), such as image 3 shown.

[0044] The main electro-optic properties of the electronically controlled smart film prepar...

Embodiment 2

[0049] Mix NDGA / PGDE / Capcure 3800 / E8 / DMP-30 according to the mass fraction ratio in Table 1. After fully stirring evenly, pour it into a liquid crystal cell made of two pieces of conductive glass coated with indium tin oxide , the thickness of the liquid crystal cell is controlled to 20.0um. After that, the sample was placed on a hot stage and cured at 313.15K for 2 hours. After the thermally polymerized monomer was cured, an electronically controlled smart film based on liquid crystal / epoxy-thiol polymer composites could be prepared.

[0050] Measure the electro-optical performance curve of the PDLC film prepared above with a liquid crystal comprehensive parameter tester, such as Figure 4 shown. The polymer network of PDLC was observed with a scanning electron microscope (SEM), such as Figure 5 shown.

[0051] The main electro-optic properties of the electronically controlled smart film prepared in Example 2 are shown in Table 3.

[0052] Table 3 Main electro-optic prop...

Embodiment 3

[0056] Mix NDGA / PGDE / Capcure 3800 / E8 / DMP-30 according to the mass fraction ratio in Table 1. After fully stirring evenly, pour it into a liquid crystal cell made of two pieces of conductive glass coated with indium tin oxide , the thickness of the liquid crystal cell is controlled to 20.0um. Afterwards, the sample was placed on a hot stage and cured at 353.15K for 2 hours. After the thermally polymerized monomer was cured, an electronically controlled smart film based on liquid crystal / epoxy-thiol polymer composites could be prepared.

[0057] Measure the electro-optical performance curve of the PDLC film prepared above with a liquid crystal comprehensive parameter tester, such as Image 6 shown. The polymer network of PDLC was observed with a scanning electron microscope (SEM), such as Figure 7 shown.

[0058] The main electro-optical properties of the electronically controlled smart film prepared in Example 3 are shown in Table 4.

[0059] The main electro-optical prope...

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Abstract

The invention belongs to the technical field of liquid crystal material application. Specifically relate to a kind of preparation method based on liquid crystal / epoxy-thiol polymer composite electronically controlled intelligent film, it is characterized in that, comprises the following steps: 1) mixing thermosetting monomer, liquid crystal, accelerant according to certain mass ratio Evenly, pour the mixture into the liquid crystal cell to obtain the sample; 2) put the sample on the hot stage to cure for 2 to 24 hours, after the thermal polymerization monomer is cured, the liquid crystal / epoxy-thiol polymer composite material electronically controlled intelligent film. The preparation process is simple and operable, and is suitable for large-area production of PDLC. Fast curing is possible, which is beneficial to improve the production efficiency of PDLC. The epoxy / thiol polymer obtained after curing has good adhesion, stability and mechanical properties, which is conducive to improving the practical value of PDLC. At the same time, based on the method, the contrast and response speed of the electronically controlled smart film can be further improved.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal material application, and in particular relates to a preparation method of an electronically controlled intelligent film based on a liquid crystal / epoxy-thiol polymer composite material. The prepared thin film has the characteristics of electrically controllable transmittance, which can be widely used in smart glass, large-area display and projection display. Background technique [0002] Liquid crystal / polymer composite materials have important application value in the fields of display and smart films. In recent years, liquid crystal / polymer composite materials represented by polymer dispersed liquid crystal films (Polymer Dispersed Liquid Crystal, hereinafter referred to as PDLC) have begun to be commercially produced. Due to the special electro-optic properties of liquid crystals, the transmittance of this film can be controlled by an external electric field, so that the transition bet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1334G02F1/1333
CPCG02F1/1333G02F1/1334
Inventor 杨槐沈文波陈刚李春昕张兰英
Owner PEKING UNIV
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