CN112824487B - Liquid crystal composition, high-frequency component and microwave antenna array - Google Patents
Liquid crystal composition, high-frequency component and microwave antenna array Download PDFInfo
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- CN112824487B CN112824487B CN201911146296.7A CN201911146296A CN112824487B CN 112824487 B CN112824487 B CN 112824487B CN 201911146296 A CN201911146296 A CN 201911146296A CN 112824487 B CN112824487 B CN 112824487B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 108
- 239000000203 mixture Substances 0.000 title claims abstract description 78
- 239000000178 monomer Substances 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 abstract description 42
- 125000004432 carbon atom Chemical group C* 0.000 description 60
- 239000000463 material Substances 0.000 description 20
- 230000000875 corresponding effect Effects 0.000 description 18
- 125000000217 alkyl group Chemical group 0.000 description 17
- 125000003342 alkenyl group Chemical group 0.000 description 16
- 238000009472 formulation Methods 0.000 description 16
- 125000003545 alkoxy group Chemical group 0.000 description 14
- 125000003302 alkenyloxy group Chemical group 0.000 description 13
- 125000004979 cyclopentylene group Chemical group 0.000 description 8
- 125000004980 cyclopropylene group Chemical group 0.000 description 8
- 125000004976 cyclobutylene group Chemical group 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 239000002019 doping agent Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 125000000876 trifluoromethoxy group Chemical group FC(F)(F)O* 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 3
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- 239000003963 antioxidant agent Substances 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- -1 isopropylbutylene group Chemical group 0.000 description 2
- 239000004611 light stabiliser Substances 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000001995 cyclobutyl group Chemical group [H]C1([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 1
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 1
- 125000001559 cyclopropyl group Chemical group [H]C1([H])C([H])([H])C1([H])* 0.000 description 1
- 238000011982 device technology Methods 0.000 description 1
- 239000005350 fused silica glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 125000005647 linker group Chemical group 0.000 description 1
- 238000003760 magnetic stirring Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/42—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40
- C09K19/44—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 containing compounds with benzene rings directly linked
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Liquid Crystal Substances (AREA)
Abstract
The invention relates to a liquid crystal composition, a high-frequency component containing the liquid crystal composition and a microwave antenna array, and belongs to the field of liquid crystal antennas. The liquid crystal composition of the present invention comprises one or more compounds selected from the group consisting of compounds represented by formula IA, compounds represented by formula IB, and one or more compounds selected from the group consisting of compounds represented by formula II. The liquid crystal composition has low rotational viscosity, good low-temperature intersolubility and high low-frequency dielectric constant.
Description
Technical Field
The invention belongs to the technical field of liquid crystal antennas, and particularly relates to a liquid crystal composition, a high-frequency component containing the liquid crystal composition and a microwave antenna array.
Background
In recent years, liquid crystal materials with low dielectric loss and high dielectric tuning rate have been attracting attention for use in liquid crystal microwave device technology such as filters, tunable frequency selective surfaces, phase shifters, phased array radars, 5G communication networks, and the like. And as a tuning material for the core of the microwave device, the dielectric tuning rate of the liquid crystal material determines the tuning capability of the microwave device. The dielectric tuning rate (τ) of a liquid crystal material is determined by the dielectric anisotropy (Δε) of the liquid crystal material under microwaves and the dielectric constant (ε /) of the liquid crystal material in the parallel direction of molecules:
τ＝Δε/ε∥
Dielectric loss of a liquid crystal material is an important factor affecting the insertion loss of its microwave device. In order to obtain high quality liquid crystal microwave devices, the dielectric loss of the liquid crystal material must be reduced. For a liquid crystal material, the loss tangent varies with the liquid crystal molecular orientation, i.e., the loss in the major and minor axes directions of the liquid crystal molecule varies with the electric field orientation, and when the loss of the liquid crystal material is calculated, the loss maximum value max (tan δ ∥,tanδ⊥) thereof is generally used as the loss of the liquid crystal material.
In order to comprehensively evaluate the performance parameters of the liquid crystal material under microwaves, a quality factor (eta) parameter is introduced:
η＝τ/max(tanδ∥,tanδ⊥)
that is, the larger the dielectric tuning rate and the smaller the loss of the liquid crystal material, the larger the quality factor, which shows that the better the performance of the liquid crystal material.
The nematic temperature range of the liquid crystal material determines the operating temperature range of the liquid crystal microwave device, and the wider the nematic temperature interval of the liquid crystal material means the wider the operating temperature range of the microwave device.
Since the dielectric constant of a liquid crystal material at high frequencies is related to the birefringence of liquid crystal, the following formula is shown:
to obtain a higher dielectric constant, it is also desirable that the liquid crystal material have a high birefringence.
In order to meet the requirement of fast switching operation of high frequency components, the liquid crystal material is also required to have low rotational viscosity. To meet the requirement that high frequency components operate under electric field drive, it is also desirable that the liquid crystal material have a suitable dielectric constant at low frequencies, e.g., 1 KHz.
Disclosure of Invention
The present inventors have conducted intensive studies in order to solve at least one of the above-mentioned problems, and have found that the liquid crystal composition of the present invention has a low rotational viscosity, good low-temperature intersolubility and a high low-frequency dielectric constant.
The invention also provides a high-frequency component containing the liquid crystal composition and a microwave antenna array.
Specifically, the present invention includes the following:
In a first aspect of the present invention, there is provided a liquid crystal composition comprising:
One or more compounds selected from the group consisting of compounds of formula IA, compounds of formula IB, and one or more compounds selected from the group consisting of compounds of formula II,
In the formula IA, R 1 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms or an alkenyloxy group having 3 to 8 carbon atoms, and any one or more of-CH 2 -in the groups represented by R 1 is optionally replaced by cyclopentylene, cyclobutylene or cyclopropylene; r 2 represents F, CF 3 or OCF 3;
independent representation/>
M represents 1,2 or 3; n represents 0 or 1;
In the formula IB, R 3 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms or an alkenyloxy group having 3 to 8 carbon atoms, and at least one of-CH 2 -in the groups represented by R 3 is replaced by cyclopentylene, cyclobutylene or cyclopropyl ene; r 4 represents F, CF 3 or OCF 3;
independent representation/>
P represents 1,2 or 3; q represents 0 or 1;
in the formula II, R 5 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms or an alkenyloxy group having 3 to 8 carbon atoms;
m 1、n1、p1、q1 represents 0 or 1, m 1+n1+p1+q1 is 1,2, 3 or 4;
independent representation/>
X represents F, CF 3、OCF3 or CN;
Each L 1、L2 independently represents H or F;
Each L 3 independently represents methyl, ethyl or propyl.
In another aspect of the present invention, there is provided a high frequency device comprising the liquid crystal composition of the present invention.
In yet another aspect of the present invention, a microwave antenna array is provided that includes the high frequency component of the present invention.
The liquid crystal composition of the invention has the characteristics of low rotational viscosity, good low-temperature intersolubility and high low-frequency dielectric constant by containing one or more compounds selected from the group consisting of compounds shown in formulas IA and IB and one or more compounds selected from the group consisting of compounds shown in formula II.
The high frequency component and the microwave antenna array of the invention have quick response, wide working temperature range and low driving voltage by containing the liquid crystal composition of the invention.
Detailed Description
[ Liquid Crystal composition ]
The liquid crystal composition of the present invention comprises one or more compounds selected from the group consisting of the compounds represented by formula IA, the compounds represented by formula IB, and one or more compounds selected from the group consisting of the compounds represented by formula II,
In the formula IA, R 1 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms or an alkenyloxy group having 3 to 8 carbon atoms, and any one or more of-CH 2 -in the groups represented by R 1 is optionally replaced by cyclopentylene, cyclobutylene or cyclopropylene; r 2 represents F, CF 3 or OCF 3;
independent representation/>
M represents 1,2 or 3; n represents 0 or 1;
In the formula IB, R 3 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms or an alkenyloxy group having 3 to 8 carbon atoms, and at least one of-CH 2 -in the groups represented by R 3 is replaced by cyclopentylene, cyclobutylene or cyclopropyl ene; r 4 represents F, CF 3 or OCF 3;
independent representation/>
P represents 1,2 or 3; q represents 0 or 1;
in the formula II, R 5 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms or an alkenyloxy group having 3 to 8 carbon atoms;
m 1、n1、p1、q1 represents 0 or 1, m 1+n1+p1+q1 is 1,2, 3 or 4;
independent representation/>
X represents F, CF 3、OCF3 or CN;
Each L 1、L2 independently represents H or F;
Each L 3 independently represents methyl, ethyl or propyl.
The liquid crystal composition of the invention obtains the characteristics of low rotational viscosity, good low-temperature intersolubility and high low-frequency dielectric constant by containing one or more compounds selected from the group consisting of compounds shown in formulas IA and IB and one or more compounds selected from the group consisting of compounds shown in formula II.
In the liquid crystal composition of the present invention, optionally, the compound represented by the above formula IA is selected from the group consisting of compounds represented by the formulas IA 1 to IA 10,
In the formulae IA 1 to IA 10, R 1 each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms or an alkenyloxy group having 3 to 8 carbon atoms, and any one or more of-CH 2 -groups represented by R 1 is optionally replaced by cyclopentylene, cyclobutylene or cyclopropylene. Preferably, R 1 each independently represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms.
In the liquid crystal composition of the present invention, optionally, the compound represented by the above formula IB is selected from the group consisting of compounds represented by the formulas IB 1 to IB 10,
As the aforementioned compounds represented by the formulas IB 1 to IB 10, R 3 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms or an alkenyloxy group having 3 to 8 carbon atoms, and at least one of-CH 2 -in the group represented by R 3 is replaced by cyclopentylene, cyclobutylene or cyclopropylene. Examples of the group obtained by substituting one or more non-adjacent ones of the alkyl groups having 1 to 10 carbon atoms represented by R 3 with a cyclopropylene group, a cyclobutylene group or a cyclopentylene group include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a methylcyclopropylene group, an ethylcyclopropylene group, a propylcyclopropylene group, an isopropylbutylene group, a n-butylcyclopropylene group, an isobutylcyclopropylene group, a tert-butylcyclopropylene group, a methylcyclobutylene group, an ethylcyclobutylene group, a propylcyclobutylene group, an isopropylcyclohexylene group, a n-butylcyclohexylene group, an isobutylcyclobutylene group, a tert-butylcyclohexylene group, a methylcyclopentylene group, an ethylcyclopentylene group, a propylcyclopentylene group, an isopropylcyclopentylene group, a n-butylcyclopentylene group, an isobutylcyclopentylene group and the like. Among the groups represented by R 3, in view of the rotational viscosity, solubility, clearing point, etc. of the liquid crystal compound, cyclopropylene or cyclopentylene is preferable.
The liquid crystal composition of the present invention is preferably a positive dielectric anisotropic liquid crystal composition.
In the liquid crystal composition of the present invention, the amount (mass ratio) of the compound represented by the formula ia or the formula ib to be added to the liquid crystal composition is not particularly limited, and the total amount of the two may be, for example, 1 to 30%, preferably 5 to 20%; the amount (mass ratio) of the compound represented by the formula II to be added to the liquid crystal composition is not particularly limited, and may be, for example, 50 to 99%, preferably 60 to 80%.
In the liquid crystal composition of the present invention, optionally, the compound represented by the above formula II is selected from the group consisting of compounds represented by the formulas II 1 to II 16,
Wherein R 5 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms; l 3 represents methyl, ethyl or propyl.
The liquid crystal composition of the invention can optionally further comprise one or more compounds shown in a formula III,
In the formula III, R 6、R7 independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms or an alkenyloxy group having 3 to 8 carbon atoms;
Representation/>
X 1、X2、X3 each independently represents H or F, and X 2、X3 is not simultaneously F.
In the liquid crystal composition of the present invention, optionally, the compound represented by the above formula III is selected from the group consisting of compounds represented by the formulas III 1 to III 3,
Wherein R 61、R71 each independently represents an alkyl group having 1 to 6 carbon atoms or an alkenyl group having 2 to 6 carbon atoms.
The liquid crystal composition of the invention can optionally contain one or more compounds shown in a formula IV,
In the formula IV, R 8 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms or an alkenyloxy group having 3 to 8 carbon atoms, R 9 represents F, CF 3、OCF3, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms or an alkenyloxy group having 3 to 8 carbon atoms;
independent representation/> />
By containing the compound represented by formula IV in the liquid crystal composition of the present invention, the birefringence and clearing point of the liquid crystal composition of the present invention can be significantly improved.
In the liquid crystal composition of the present invention, optionally, the compound represented by the above formula IV is selected from the group consisting of compounds represented by the formulas IV1 to IV7,
Wherein R 8 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms or an alkenyloxy group having 3 to 8 carbon atoms, R 91 represents a F, CF 3、OCF3,R92 group which represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms or an alkenyloxy group having 3 to 8 carbon atoms;
y 1、Y2、Y3、Y4 each independently represents H or F, and Y 1、Y2、Y3、Y4 does not simultaneously represent H.
The amount (mass ratio) of the compound represented by the formula IV to be added to the liquid crystal composition of the present invention is not particularly limited, and may be, for example, 1 to 20%, preferably 5 to 15%.
In the liquid crystal composition of the present invention, optionally, various functional dopants may be added, and when the dopants are contained, the content of the dopants is preferably 0.01 to 1% by mass based on the liquid crystal composition, and examples of the dopants include antioxidants, light stabilizers, and chiral agents.
The antioxidants can be exemplified by the following,
The light stabilizer may be exemplified by the following,
U represents an integer of 1 to 10.
[ High-frequency Assembly, microwave antenna array ]
The invention also relates to a high frequency component comprising the liquid crystal composition of the invention.
The invention also relates to a microwave antenna array comprising the inventive high frequency component.
The high-frequency component and the microwave antenna array of the invention comprise the liquid crystal composition of the invention, and have the advantages of quick response, wide working temperature range and low driving voltage.
Examples
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
In the invention, the preparation method is a conventional method unless specified otherwise, the raw materials used can be obtained from the disclosed commercial path unless specified otherwise, the percentages refer to mass percentages, the temperature is in degrees centigrade (DEG C), the liquid crystal compound is also a liquid crystal monomer, and the specific meanings and testing conditions of other symbols are as follows:
Cp represents a liquid crystal clearing point (DEG C), and is tested by DSC quantification;
Δn represents optical anisotropy, Δn=n e-no, where n o is the refractive index of ordinary light, n e is the refractive index of extraordinary light, and the test conditions are 20±2 ℃,589nm, and abbe refractometer test;
Delta epsilon represents dielectric anisotropy, delta epsilon=epsilon ∥-ε⊥, wherein epsilon ∥ is the dielectric constant parallel to the molecular axis, epsilon ⊥ is the dielectric constant perpendicular to the molecular axis, the test conditions are 20+/-0.5 ℃, 20-micrometer antiparallel boxes, INSTEC: ALCT-CUST-4C test;
Gamma 1 represents the rotational viscosity (mPas) under 20+ -0.5deg.C, 20 μm antiparallel box, INSTEC: ALCT-CUST-4C test.
The preparation method of the liquid crystal composition comprises the following steps: and weighing each liquid crystal monomer according to a certain proportion, putting the liquid crystal monomers into a stainless steel beaker, placing the stainless steel beaker with each liquid crystal monomer on a magnetic stirring instrument for heating and melting, adding a magnetic rotor into the stainless steel beaker after the liquid crystal monomers in the stainless steel beaker are melted, uniformly stirring the mixture, and cooling to room temperature to obtain the liquid crystal composition.
Test method for liquid crystal performance under high frequency by adopting literature report ：Penirschke,A.(2004).Cavity perturbation method for characterization of liquid crystals up to 35GHz.Microwave Conference,2004.34thEuropean.
Liquid crystal was introduced into Polytetrafluoroethylene (PTFE) or fused silica capillaries, and the filled capillaries were introduced into the middle of the chamber having a resonance frequency of 19 GHz. The input signal source is then applied and the result of the output signal is recorded with a vector network analyzer. The change in the resonance frequency and Q factor between the capillary filled with liquid crystal and the blank capillary was measured, and the dielectric constant and loss tangent were calculated. The permittivity components perpendicular and parallel to the liquid crystal directors are obtained by alignment of the liquid crystal in a magnetic field, the direction of the magnetic field is set accordingly, and then rotated by 90 ° accordingly.
The structures of the liquid crystal monomers used in the embodiments of the invention are represented by codes, and the codes of the liquid crystal ring structures, the end groups and the connecting groups are represented by the following tables 1 and 2:
table 1: corresponding code of ring structure
Table 2: corresponding codes of end groups and linking groups
Examples:
The code is PGUQU-3-F;
The code is PGUQU-Cp-F; /(I)
The code is PGUQU-Cpr1-F;
The code is DPUQK-3-F;
the code is APUQK-3-F;
The code is GP (2) WU-4-F;
the code is PGP (2) WU-3-F;
the code is PWPi (2) PU-4-F;
the code is CPGP-3-O2;
The code is PPGU-3-F;
The code is PPYY-4-3.
Example 1:
The formulation and corresponding properties of the liquid crystal composition are shown in Table 3 below.
Table 3: formulation and corresponding Properties of the liquid Crystal composition of example 1
Example 2:
the formulation and corresponding properties of the liquid crystal composition are shown in Table 4 below.
Table 4: formulation and corresponding Properties of the liquid Crystal composition of example 2
/>
Example 3:
The formulation and corresponding properties of the liquid crystal composition are shown in Table 5 below.
Table 5: formulation and corresponding Properties of the liquid Crystal composition of example 3
Example 4:
the formulation and corresponding properties of the liquid crystal composition are shown in Table 6 below.
Table 6: formulation and corresponding Properties of the liquid Crystal composition of example 4
/>
Example 5:
The formulation and corresponding properties of the liquid crystal composition are shown in Table 7 below.
Table 7: formulation and corresponding Properties of the liquid Crystal composition of example 5
/>
Example 6:
the formulation and corresponding properties of the liquid crystal composition are shown in Table 8 below.
Table 8: formulation and corresponding Properties of the liquid Crystal composition of example 6
/>
Example 7:
the formulation and corresponding properties of the liquid crystal composition are shown in Table 9 below.
Table 9: formulation and corresponding Properties of the liquid Crystal composition of example 7
/>
Comparative example 1:
The formulation and corresponding properties of the liquid crystal composition are shown in Table 10 below.
Table 10: formulation and corresponding Properties of the liquid Crystal composition of comparative example 1
As can be seen from the above examples, the liquid crystal composition provided in the examples has low rotational viscosity, good low-temperature intersolubility and high low-frequency dielectric constant. Also, as is apparent from comparison with the liquid crystal composition provided in the comparative example, the liquid crystal composition provided in the example has a lower rotational viscosity γ 1, a better low-temperature intersolubility and a higher low-frequency dielectric constant. Accordingly, the high frequency component, microwave antenna array comprising the liquid crystal composition of the embodiment has a faster response speed, a wider operating temperature range and a lower driving voltage.
Claims (3)
1. A liquid crystal composition, characterized in that the liquid crystal composition is shown in any one of tables 3 to 9 below:
Table 3:
Table 4:
Table 5:
Table 6:
table 7:
Table 8:
Table 9:
Wherein the content is mass content;
APUQK-3-F has the structure: PGUQK-3-F has the structure: CPUQK-2-F has the structure: DGUQK-4-F has the structure: DGUQK-2-F has the structure: APUQU-Cp-F has the structure: PGUQU-Cp-F has the structure: CPUQU-Cp-F has the structure: PGUQU-Cpr1-F has the structure: PUQU-Cp-F has the structure:
the structure of the PP (2) WU-3-F is as follows: the structure of the PP (2) WU-4-F is as follows: PWPi (2) the PU-4-F structure is as follows: The PWP (2) PU-4-F has the structure that: The structure of PGP (2) WU-3-F is as follows: The structure of PGP (2) WU-4-F is as follows: The CPPC-3-2 has the structure: CPGC-3-2 has the structure: PPGU-3-F has the structure: PGGP-2-3 has the structure:
2. a high frequency component comprising the liquid crystal composition of any one of claim 1.
3. A microwave antenna array comprising the high frequency assembly of claim 2.
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| CN102510891A (en) * | 2009-09-25 | 2012-06-20 | 默克专利股份有限公司 | Components for high-frequency technology and liquid crystal media |
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| CN102510891A (en) * | 2009-09-25 | 2012-06-20 | 默克专利股份有限公司 | Components for high-frequency technology and liquid crystal media |
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