CN109705883B - High-stability fluorine-containing blue phase liquid crystal composite material and preparation method thereof - Google Patents
High-stability fluorine-containing blue phase liquid crystal composite material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a fluorine-containing blue phase liquid crystal composite material with high stability and a preparation method thereof, belonging to the technical field of liquid crystal materials. The blue phase liquid crystal composite material comprises blue phase liquid crystal and an additive, wherein the blue phase liquid crystal comprises the following components in parts by weight: 65-85 parts of fluorine-containing liquid crystal compound and 15-35 parts of chiral agent; the additive comprises the following components in parts by weight: 0.5-3 parts of doped polyacetylene, 0.2-1.5 parts of nano cerium dioxide and 0.3-1.5 parts of diaryl iodonium salt. According to the invention, fluorine-containing bis-diphenylacetylene liquid crystal and 3CCUO8 fluorine-containing chiral agent are used as blue phase liquid crystal matrix, and a proper amount of additive containing components such as doped polyacetylene and nano cerium dioxide is added, so that the Kerr constant and the thermal stability of the blue phase liquid crystal composite material can be remarkably improved, the driving voltage and the electro-optic retardation of the blue phase liquid crystal composite material can be reduced, and the problems of high driving voltage and high electro-optic retardation of the existing blue phase liquid crystal material can be solved.
Description
Technical Field
The invention relates to the technical field of liquid crystal materials, in particular to a fluorine-containing blue phase liquid crystal composite material with high stability and a preparation method thereof.
Background
The blue phase liquid crystal is a material of a double-helix three-dimensional superstructure, is in a special phase state between an isotropic state and a cholesteric phase, has the characteristic of high electric field response speed, and is a new trend of liquid crystal displays. Compared with the traditional liquid crystal display, the blue phase liquid crystal display has high electric field response speed, can not need a color filter and a visual compensation film, and can reduce the production cost of the display to a certain extent.
However, the blue phase of the conventional blue phase liquid crystal material has problems of narrow temperature range, poor thermal stability, high driving voltage, high electro-optical retardation, low dielectric anisotropy, and the like, and thus is difficult to be well popularized. Although the conventional fluorine-containing blue phase liquid crystal can reduce the viscosity of the blue phase liquid crystal material and improve the dielectric anisotropy of the blue phase liquid crystal by introducing fluorine atoms, the blue phase liquid crystal material still has the problems of poor stability, high driving voltage and high electro-optic retardation, and further research on the blue phase liquid crystal material is required.
Disclosure of Invention
The invention aims to provide a fluorine-containing blue phase liquid crystal composite material with low driving voltage, low electro-optical hysteresis and high stability and a preparation method thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a high-stability fluorine-containing blue phase liquid crystal composite material comprises blue phase liquid crystal and an additive, wherein the blue phase liquid crystal comprises the following components in parts by weight: 65-85 parts of fluorine-containing liquid crystal compound and 15-35 parts of chiral agent; the additive comprises the following components in parts by weight: 0.5-3 parts of doped polyacetylene, 0.2-1.5 parts of nano cerium dioxide and 0.3-1.5 parts of diaryl iodonium salt.
As a further scheme of the invention, the additive comprises the following components in parts by weight: 1-2 parts of doped polyacetylene, 0.5-1 part of nano cerium dioxide and 0.5-1 part of diaryl iodonium salt.
In a still further embodiment of the present invention, the fluorine-containing liquid crystal compound is a fluorine-containing bis-diphenylacetylene liquid crystal.
As a further scheme of the invention, the chemical structural formula of the fluorine-containing bis-diphenylacetylene liquid crystal is as follows:
as a further scheme of the invention, the chiral agent is a 3CCUO8 fluorine-containing chiral agent, and the chemical structural formula is as follows:
as a still further aspect of the present invention, the doped polyacetylene is iodine doped polyacetylene or bromine doped polyacetylene.
The preparation method of the fluorine-containing blue phase liquid crystal composite material with high stability comprises the following steps:
(1) firstly, mixing and mixing the components in the additive according to the parts by weight, adding absolute ethyl alcohol, and dispersing by using ultrasonic waves to obtain an additive dispersion liquid;
(2) and then mixing and mixing the components in the blue phase liquid crystal according to the weight parts, adding the additive dispersion liquid, heating, performing ultrasonic dispersion to obtain a liquid crystal dispersion liquid, and finally performing vacuum drying on the liquid crystal dispersion liquid to remove absolute ethyl alcohol to obtain the fluorine-containing blue phase liquid crystal composite material.
As a further scheme of the invention, the mass of the additive dispersion liquid added in the step (1) is 1-6% of the mass of the blue phase liquid crystal.
Compared with the prior art, the invention has the beneficial effects that:
the invention has novel formula, takes the fluorine-containing bis-diphenylacetylene liquid crystal and the 3CCUO8 fluorine-containing chiral agent as the blue phase liquid crystal matrix, can obviously improve the Kerr constant and the thermal stability of the blue phase liquid crystal composite material and reduce the driving voltage and the electro-optical delay of the blue phase liquid crystal composite material by adding a proper amount of additive containing components such as iodine or bromine-doped polyacetylene and nano cerium dioxide, has the characteristics of high response speed to an electric field, low viscosity, high dielectric direction diversity, long service life and the like, and has wide application range.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A high-stability fluorine-containing blue phase liquid crystal composite material comprises blue phase liquid crystal and an additive, wherein the blue phase liquid crystal comprises the following components in parts by weight: 85 parts of fluorine-containing liquid crystal compound and 15 parts of chiral agent; the additive comprises the following components in parts by weight: 0.5 part of doped polyacetylene, 0.2 part of nano cerium dioxide and 0.3 part of diaryl iodonium salt. The fluorine-containing liquid crystal compound is fluorine-containing bis-diphenyl acetylene liquid crystal, and the chemical structural formula of the fluorine-containing bis-diphenyl acetylene liquid crystal is as follows:
the chiral agent is a 3CCUO8 fluorine-containing chiral agent, and the chemical structural formula is as follows:
the doped polyacetylene is iodine doped polyacetylene;
the preparation method of the fluorine-containing blue phase liquid crystal composite material with high stability comprises the following steps:
(1) firstly, mixing and mixing the components in the additive according to the parts by weight, adding absolute ethyl alcohol, and dispersing by using ultrasonic waves to obtain an additive dispersion liquid;
(2) and then mixing and mixing the components in the blue phase liquid crystal according to the weight parts, adding the additive dispersion liquid, heating, performing ultrasonic dispersion to obtain a liquid crystal dispersion liquid, and finally performing vacuum drying on the liquid crystal dispersion liquid to remove absolute ethyl alcohol to obtain the fluorine-containing blue phase liquid crystal composite material. Wherein the mass of the additive dispersion liquid is 1% of the mass of the blue phase liquid crystal.
Example 2
A high-stability fluorine-containing blue phase liquid crystal composite material comprises blue phase liquid crystal and an additive, wherein the blue phase liquid crystal comprises the following components in parts by weight: 65 parts of fluorine-containing liquid crystal compound and 35 parts of chiral agent; the additive comprises the following components in parts by weight: 3 parts of doped polyacetylene, 1.5 parts of nano cerium dioxide and 1.5 parts of diaryl iodonium salt. The fluorine-containing liquid crystal compound is fluorine-containing bis-diphenyl acetylene liquid crystal, and the chemical structural formula of the fluorine-containing bis-diphenyl acetylene liquid crystal is as follows:
the chiral agent is a 3CCUO8 fluorine-containing chiral agent, and the chemical structural formula is as follows:
the doped polyacetylene is bromine doped polyacetylene.
The preparation method of the fluorine-containing blue phase liquid crystal composite material with high stability comprises the following steps:
(1) firstly, mixing and mixing the components in the additive according to the parts by weight, adding absolute ethyl alcohol, and dispersing by using ultrasonic waves to obtain an additive dispersion liquid;
(2) and then mixing and mixing the components in the blue phase liquid crystal according to the weight parts, adding the additive dispersion liquid, heating, performing ultrasonic dispersion to obtain a liquid crystal dispersion liquid, and finally performing vacuum drying on the liquid crystal dispersion liquid to remove absolute ethyl alcohol to obtain the fluorine-containing blue phase liquid crystal composite material. Wherein the mass of the additive dispersion liquid is 6% of the mass of the blue phase liquid crystal.
Example 3
A high-stability fluorine-containing blue phase liquid crystal composite material comprises blue phase liquid crystal and an additive, wherein the blue phase liquid crystal comprises the following components in parts by weight: 65 parts of fluorine-containing liquid crystal compound and 15 parts of chiral agent; the additive comprises the following components in parts by weight: 1 part of doped polyacetylene, 0.5 part of nano cerium dioxide and 0.5 part of diaryl iodonium salt. The fluorine-containing liquid crystal compound is fluorine-containing bis-diphenyl acetylene liquid crystal, and the chemical structural formula of the fluorine-containing bis-diphenyl acetylene liquid crystal is as follows:
the chiral agent is a 3CCUO8 fluorine-containing chiral agent, and the chemical structural formula is as follows:
the doped polyacetylene is iodine doped polyacetylene.
The preparation method of the fluorine-containing blue phase liquid crystal composite material with high stability comprises the following steps:
(1) firstly, mixing and mixing the components in the additive according to the parts by weight, adding absolute ethyl alcohol, and dispersing by using ultrasonic waves to obtain an additive dispersion liquid;
(2) and then mixing and mixing the components in the blue phase liquid crystal according to the weight parts, adding the additive dispersion liquid, heating, performing ultrasonic dispersion to obtain a liquid crystal dispersion liquid, and finally performing vacuum drying on the liquid crystal dispersion liquid to remove absolute ethyl alcohol to obtain the fluorine-containing blue phase liquid crystal composite material. Wherein the mass of the additive dispersion liquid is 1% of the mass of the blue phase liquid crystal.
Example 4
A high-stability fluorine-containing blue phase liquid crystal composite material comprises blue phase liquid crystal and an additive, wherein the blue phase liquid crystal comprises the following components in parts by weight: 85 parts of fluorine-containing liquid crystal compound and 35 parts of chiral agent; the additive comprises the following components in parts by weight: 2 parts of doped polyacetylene, 1 part of nano cerium dioxide and 1 part of diaryl iodonium salt. The fluorine-containing liquid crystal compound is fluorine-containing bis-diphenyl acetylene liquid crystal, and the chemical structural formula of the fluorine-containing bis-diphenyl acetylene liquid crystal is as follows:
the chiral agent is a 3CCUO8 fluorine-containing chiral agent, and the chemical structural formula is as follows:
the doped polyacetylene is bromine doped polyacetylene.
The preparation method of the fluorine-containing blue phase liquid crystal composite material with high stability comprises the following steps:
(1) firstly, mixing and mixing the components in the additive according to the parts by weight, adding absolute ethyl alcohol, and dispersing by using ultrasonic waves to obtain an additive dispersion liquid;
(2) and then mixing and mixing the components in the blue phase liquid crystal according to the weight parts, adding the additive dispersion liquid, heating, performing ultrasonic dispersion to obtain a liquid crystal dispersion liquid, and finally performing vacuum drying on the liquid crystal dispersion liquid to remove absolute ethyl alcohol to obtain the fluorine-containing blue phase liquid crystal composite material. Wherein the mass of the additive dispersion liquid is 6% of the mass of the blue phase liquid crystal.
Example 5
A high-stability fluorine-containing blue phase liquid crystal composite material comprises blue phase liquid crystal and an additive, wherein the blue phase liquid crystal comprises the following components in parts by weight: 80 parts of fluorine-containing liquid crystal compound and 20 parts of chiral agent; the additive comprises the following components in parts by weight: 1.5 parts of doped polyacetylene, 0.6 part of nano cerium dioxide and 0.9 part of diaryl iodonium salt. The fluorine-containing liquid crystal compound is fluorine-containing bis-diphenyl acetylene liquid crystal, and the chemical structural formula of the fluorine-containing bis-diphenyl acetylene liquid crystal is as follows:
the chiral agent is a 3CCUO8 fluorine-containing chiral agent, and the chemical structural formula is as follows:
the doped polyacetylene is iodine doped polyacetylene.
The preparation method of the fluorine-containing blue phase liquid crystal composite material with high stability comprises the following steps:
(1) firstly, mixing and mixing the components in the additive according to the parts by weight, adding absolute ethyl alcohol, and dispersing by using ultrasonic waves to obtain an additive dispersion liquid;
(2) and then mixing and mixing the components in the blue phase liquid crystal according to the weight parts, adding the additive dispersion liquid, heating, performing ultrasonic dispersion to obtain a liquid crystal dispersion liquid, and finally performing vacuum drying on the liquid crystal dispersion liquid to remove absolute ethyl alcohol to obtain the fluorine-containing blue phase liquid crystal composite material. Wherein the mass of the additive dispersion liquid is 3% of the mass of the blue phase liquid crystal.
Example 6
A high-stability fluorine-containing blue phase liquid crystal composite material comprises blue phase liquid crystal and an additive, wherein the blue phase liquid crystal comprises the following components in parts by weight: 82 parts of fluorine-containing liquid crystal compound and 18 parts of chiral agent; the additive comprises the following components in parts by weight: 1.5 parts of doped polyacetylene, 0.8 part of nano cerium dioxide and 0.7 part of diaryl iodonium salt. The fluorine-containing liquid crystal compound is fluorine-containing bis-diphenyl acetylene liquid crystal, and the chemical structural formula of the fluorine-containing bis-diphenyl acetylene liquid crystal is as follows:
the chiral agent is a 3CCUO8 fluorine-containing chiral agent, and the chemical structural formula is as follows:
the doped polyacetylene is iodine doped polyacetylene.
The preparation method of the fluorine-containing blue phase liquid crystal composite material with high stability comprises the following steps:
(1) firstly, mixing and mixing the components in the additive according to the parts by weight, adding absolute ethyl alcohol, and dispersing by using ultrasonic waves to obtain an additive dispersion liquid;
(2) and then mixing and mixing the components in the blue phase liquid crystal according to the weight parts, adding the additive dispersion liquid, heating, performing ultrasonic dispersion to obtain a liquid crystal dispersion liquid, and finally performing vacuum drying on the liquid crystal dispersion liquid to remove absolute ethyl alcohol to obtain the fluorine-containing blue phase liquid crystal composite material. Wherein the mass of the additive dispersion liquid is 3% of the mass of the blue phase liquid crystal.
Comparative example 1
The other components and their contents and preparation method were the same as in example 6 except that the additive contained no doped polyacetylene component.
Comparative example 2
The other components and their contents and preparation method were the same as in example 6 except that the nano-ceria component was not contained in the additive.
The blue phase liquid crystal composite materials prepared in the above examples 1 to 6 and comparative examples 1 to 2 were compared with the blue phase liquid crystal material of the existing product in terms of properties such as driving voltage, kerr constant, electro-optical retardation, phase transition temperature (blue phase starting temperature and blue phase ending temperature). Wherein, the detection results are shown in the following table 1:
TABLE 1
As can be seen from the detection results in table 1 above, compared with the blue phase liquid crystal material of the existing product, the blue phase liquid crystal composite material prepared according to the technical schemes of embodiments 1 to 6 provided by the present invention has the advantages that the driving voltage is reduced by 23% to 36%, the electro-optical retardation is significantly reduced, the kohl constant is significantly larger, and the blue phase has a wider temperature range, i.e., has higher thermal stability.
It can be seen from the test results of comparative examples 1-2 and example 6 that the addition of the additive containing the components doped with polyacetylene and nano-ceria to the blue phase liquid crystal can significantly improve the kerr constant and the thermal stability of the blue phase liquid crystal composite, and reduce the driving voltage and the electro-optic retardation of the blue phase liquid crystal composite.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (2)
1. The fluorine-containing blue phase liquid crystal composite material with high stability comprises blue phase liquid crystal and an additive, and is characterized in that the blue phase liquid crystal comprises the following components in parts by weight: 65-85 parts of fluorine-containing liquid crystal compound and 15-35 parts of chiral agent; the additive comprises the following components in parts by weight: 0.5-3 parts of doped polyacetylene, 0.2-1.5 parts of nano cerium dioxide and 0.3-1.5 parts of diaryl iodonium salt; the fluorine-containing liquid crystal compound is fluorine-containing bis-diphenylacetylene liquid crystal; the doped polyacetylene is iodine doped polyacetylene or bromine doped polyacetylene; the chiral agent is a 3CCUO8 fluorine-containing chiral agent, and the chemical structural formula is as follows:
the fluorine-containing liquid crystal compound has a chemical structural formula as follows:
the preparation method of the fluorine-containing blue phase liquid crystal composite material comprises the following steps:
(1) firstly, mixing and mixing the components in the additive according to the parts by weight, adding absolute ethyl alcohol, and dispersing by using ultrasonic waves to obtain an additive dispersion liquid;
(2) then, mixing and mixing the components in the blue phase liquid crystal according to the weight parts, adding the additive dispersion liquid, heating, performing ultrasonic dispersion to obtain a liquid crystal dispersion liquid, and finally performing vacuum drying on the liquid crystal dispersion liquid to remove absolute ethyl alcohol to obtain the fluorine-containing blue phase liquid crystal composite material; the mass of the added additive dispersion liquid is 1-6% of the mass of the blue phase liquid crystal.
2. The highly stable fluorine-containing blue phase liquid crystal composite material as claimed in claim 1, wherein the additive comprises the following components in parts by weight: 1-2 parts of doped polyacetylene, 0.5-1 part of nano cerium dioxide and 0.5-1 part of diaryl iodonium salt.
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