CN112824489B - 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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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 109
- 239000000203 mixture Substances 0.000 title claims abstract description 85
- 150000001875 compounds Chemical class 0.000 claims abstract description 76
- 125000004432 carbon atom Chemical group C* 0.000 claims description 81
- 125000000217 alkyl group Chemical group 0.000 claims description 31
- 125000004979 cyclopentylene group Chemical group 0.000 claims description 9
- 125000004980 cyclopropylene group Chemical group 0.000 claims description 9
- 125000003342 alkenyl group Chemical group 0.000 description 20
- 230000000875 corresponding effect Effects 0.000 description 20
- 239000000463 material Substances 0.000 description 20
- 238000009472 formulation Methods 0.000 description 18
- 125000003302 alkenyloxy group Chemical group 0.000 description 16
- 125000003545 alkoxy group Chemical group 0.000 description 15
- 125000004976 cyclobutylene group Chemical group 0.000 description 8
- 239000000178 monomer Substances 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
- 238000012360 testing method Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000003963 antioxidant agent Substances 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000004611 light stabiliser Substances 0.000 description 2
- 238000000034 method Methods 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- -1 Polytetrafluoroethylene Polymers 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 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
- 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
- 230000003287 optical effect Effects 0.000 description 1
- 125000001820 oxy group Chemical group [*:1]O[*:2] 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
- H01P1/18—Phase-shifters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/30—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array
- H01Q3/34—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array by electrical means
- H01Q3/36—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array by electrical means with variable phase-shifters
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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 invention comprises one or more compounds selected from the group consisting of compounds shown in a formula IA and compounds shown in a formula IB, and one or more compounds selected from the group consisting of compounds shown in a formula II, compounds shown in a formula III and compounds shown in a formula IV. The liquid crystal composition has good low-temperature intersolubility.
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 (tau) of the liquid crystal material is determined by the dielectric anisotropy (delta epsilon) of the liquid crystal material under microwaves and the dielectric constant (epsilon) of the liquid crystal material in the direction parallel to the molecules ∥ ) The determination is as follows:
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 liquid crystal materials, the loss tangent varies with the direction of the liquid crystal molecules and the direction of the electric field, i.e. the loss in the major axis and the minor axis directions of the liquid crystal molecules varies, and when calculating the loss of the liquid crystal material, the method is generally adoptedIts loss maximum max (tan delta) ∥ ,tanδ ⊥ ) As a loss of 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 good low-temperature miscibility.
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 a compound represented by formula IA, a compound represented by formula IB, and one or more compounds selected from the group consisting of a compound represented by formula II, a compound represented by formula III, and a compound represented by formula IV;
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 R 1 Any one or more of the groups shown-CH 2 Optionally substituted with cyclopentylene, cyclobutylene or cyclopropyl ene; r is R 2 Representation 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 R 3 Any one or more of the groups shown-CH 2 Optionally substituted with cyclopentylene, cyclobutylene or cyclopropyl ene; r is R 4 Representation 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 H, 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;
n 1 represents 0 or 1;
independent representation-> And->Also indicate->
In the formula III, R 6 Represents H, 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,
Z 1 represents-ch=ch-, -c≡c-, or-cf=cf-,
independent representation->
In formula IV, R 7 Represents H, alkyl having 1 to 10 carbon atoms, or alkyl having 1 to 10 carbon atomsAn oxy group, an alkenyl group having 2 to 10 carbon atoms or an alkenyloxy group having 3 to 8 carbon atoms,
Z 2 、Z 3 one of them represents-ch=ch-, -c≡c-or-cf=cf-, the other independently represents-ch=ch-, -cf=cf-, or a single bond,
independent representation-> And->Also indicate->
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 has the characteristic of good low-temperature intersolubility 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, compounds shown in formula III and compounds shown in formula IV.
The high-frequency component and the microwave antenna array have wide working temperature range by containing the liquid crystal composition.
Detailed Description
[ liquid Crystal composition ]
The liquid crystal composition of the present invention comprises one or more compounds selected from the group consisting of a compound represented by formula ia, a compound represented by formula ib, and one or more compounds selected from the group consisting of a compound represented by formula ii, a compound represented by formula iii, and a compound represented by formula IV;
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 R 1 Any one or more of the groups shown-CH 2 Optionally substituted with cyclopentylene, cyclobutylene or cyclopropyl ene; r is R 2 Representation 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 R 3 Any one or more of the groups shown-CH 2 Optionally substituted with cyclopentylene, cyclobutylene or cyclopropyl ene; r is R 4 Representation 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 H, 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;
n 1 represents 0 or 1;
independent representation-> And->Also indicate->
In the formula III, R 6 Represents H, 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,
Z 1 represents-ch=ch-, -c≡c-, or-cf=cf-,
independent representation->
In formula IV, R 7 Represents H, 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,
Z 2 、Z 3 one of them represents-ch=ch-, -c≡c-or-cf=cf-, the other independently represents-ch=ch-, -cf=cf-, or a single bond,
independent representation-> And->Also indicate->
The liquid crystal composition has the characteristic of good low-temperature intersolubility 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, compounds shown in formula III and compounds shown in formula IV.
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 R 1 Any one or more of the groups shown-CH 2 Optionally substituted with cyclopentylene, cyclobutylene or cyclopropyl ene. 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 of the formulae 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 R 3 Any one or more of the groups shown-CH 2 Optionally substituted with cyclopentylene, cyclobutylene or cyclopropyl ene. R is R 3 One or more non-adjacent-CH in the alkyl group having 1 to 10 carbon atoms 2 Examples of the group substituted with a cyclopropylene group, a cyclobutylene group or a cyclopentylene group include a cyclopropyl group, a cyclobutylene group, a cyclopentyl group, a methylcyclopropylene group, an ethylcyclopropylene group, a propylcyclopropylene group, an isopropylcyclopropylene group, a n-butylcyclopropylene group, an isobutylcyclopropylene group, a tert-butylcyclopropylene group, a methylcyclobutylene group, an ethylcyclobutylene group, a propylcyclobutylene group, an isopropylcyclobutylene group, a n-butylcyclobutylene group, an isobutylcyclobutylene group, a tert-butylcyclobutylene group, a methylcyclopentylene group, an ethylcyclopentylene group, a propylenecyclopentylene groupCyclopentylene, isopropylcyclopentylene, n-butylcyclopentylene, isobutylcyclopentylene, and the like. R is R 3 Among the groups shown, cyclopropylene or cyclopentylene is preferable in terms of rotational viscosity, solubility, clearing point, and the like of the liquid crystal compound.
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, the formula III, and the formula IV to be added to the liquid crystal composition is not particularly limited, and the total amount of the three 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 11,
wherein R is 5 Represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms. Preferably, R 5 Represents an alkyl group having 1 to 5 carbon atoms.
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, 5 to 70%, preferably 10 to 50%.
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 10,
wherein R is 6 Represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, preferably R 6 Represents an alkyl group having 1 to 5 carbon atoms.
The amount (mass ratio) of the compound represented by the formula III to be added to the liquid crystal composition is not particularly limited, and may be, for example, 5 to 60%, preferably 10 to 50%.
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 IV8,
wherein R is 7 Represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms. Preferably, R 7 Represents an alkyl group having 1 to 5 carbon atoms.
The amount (mass ratio) of the compound represented by the formula IV to be added to the liquid crystal composition is not particularly limited, and may be, for example, 5 to 45%, preferably 10 to 40%.
The liquid crystal composition of the invention may optionally further comprise one or more compounds of formula V,
in V, 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 Representation F, CF 3 、OCF 3 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 V 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 V is selected from the group consisting of compounds represented by the formulas V1 to V7,
wherein R is 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 Representation F, CF 3 、OCF 3 ，R 92 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 、Y 2 、Y 3 、Y 4 each independently represents H or F, and Y 1 、Y 2 、Y 3 、Y 4 H is not represented at the same time.
The amount (mass ratio) of the compound represented by the formula V 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 wide working temperature range.
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 -n o Wherein n is o Refractive index of ordinary ray, n e The refractive index of the extraordinary ray is 20+/-2 ℃ and is measured by an Abbe refractometer at 589 nm;
delta epsilon represents dielectric anisotropy, delta epsilon = epsilon-epsilon, where epsilon is the dielectric constant parallel to the molecular axis ⊥ For the dielectric constant perpendicular to the molecular axis, the test condition is 20+/-0.5 ℃ and 20 micrometers anti-parallel box, INSTEC: ALCT-CUST-4C test;
γ 1 the rotational viscosity (mPas) was measured at 20.+ -. 0.5 ℃ and 20 ± 0.5 ℃under the conditionsMicron antiparallel cassette, INSTC: 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.
The performance of liquid crystal at high frequency is tested by a test method reported in literature: penirschke, a. (2004). Cavity perturbation method for characterization of liquid crystals up to 35GHz.Microwave Conference,2004.34th European.
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;
the code is PGUQU-Cpr1-F; />
The code is DPUQK-3-F;
the code is APUQK-3-F;
the code is PG-2-S;
the code is CGU-3-S;
the code is PVU-4-S;
the code is GWU-4-S;
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
Example 8:
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 example 8
Comparative example 1:
the formulation and corresponding properties of the liquid crystal composition are shown in Table 11 below.
Table 11: 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 good low-temperature miscibility. And, as is apparent from comparison with the liquid crystal composition of the comparative example, the liquid crystal composition provided in the examples has better low-temperature intersolubility. Thus, the high frequency component, microwave antenna array comprising the liquid crystal composition of the embodiments has a wider operating temperature range.
Claims (4)
1. A liquid crystal composition, characterized in that it comprises:
one or more compounds selected from the group consisting of a compound represented by formula IA, a compound represented by formula IB, and one or more compounds selected from the group consisting of a compound represented by formula II, a compound represented by formula III, and a compound represented by formula IV;
the compound shown in the formula IA is selected from the group consisting of compounds shown in the formulas IA 4, IA 5, IA 8 and IA 10,
wherein R is 1 Each independently represents an alkyl group having 1 to 10 carbon atoms;
the compound shown in the formula IB is selected from the group consisting of compounds shown in the formulas IB 4, IB 5 and IB 8,
wherein R is 3 Represents an alkyl group having 1 to 10 carbon atoms and R 3 Any one or more of the groups shown-CH 2 -optionally substituted with cyclopentylene or cyclopropyl ene;
the compound shown in the formula II is selected from the group consisting of compounds shown in formulas II 3, II 7 and II 10,
wherein R is 5 Represents an alkyl group having 1 to 10 carbon atoms;
the compound shown in the formula III is selected from the group consisting of compounds shown in the formulas III 2, III 6 and III 7,
wherein R is 6 Represents an alkyl group having 1 to 10 carbon atoms;
the compound shown in the formula IV is selected from compounds shown in a formula IV 3,
wherein R is 7 Represents an alkyl group having 1 to 10 carbon atoms.
2. The liquid crystal composition according to claim 1, further comprising one or more compounds of formula V,
the compound shown in the formula V is selected from compounds shown in the formula V1,
wherein R is 8 Represents an alkyl group having 1 to 10 carbon atoms, R 91 Represents F;
Y 1 、Y 2 each independently represents H.
3. A high frequency component comprising the liquid crystal composition according to any one of claims 1 to 2.
4. A microwave antenna array comprising the high frequency assembly of claim 3.
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| CN109880637A (en) * | 2019-03-29 | 2019-06-14 | 石家庄诚志永华显示材料有限公司 | Liquid-crystal composition, liquid crystal display element, liquid crystal display |
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