A method and system for rapid measurement of the degree of orientation of a polar material

Abstract

The application belongs to the technical field of polar polymer molecule orientation, and discloses a kind of polar material orientation degree fast measurement method, including obtaining the relative dielectric constant of the whole polar material to be measured, and the relative dielectric constant of the polar material to be measured in the first direction and the second direction;Obtain the polarizability of the polar material to be measured in the first direction and the second direction;Based on the relative dielectric constant and the polarizability, the orientation degree of the polar material is obtained by using the following orientation degree calculation formula, and a kind of polar material orientation degree fast measurement system is provided.The application can realize the millisecond level measurement of the orientation degree of polar material, and has strong anti-interference ability.

Description

Technical Field

[0001] This invention belongs to the technical field of polar polymer molecular orientation, and more specifically, relates to a rapid measurement method and system for polar material orientation. Background Technology

[0002] Polar materials, especially liquid crystals, have been widely used in display devices, organic semiconductors, and biosensors due to their typical alignment structure. Fundamentally, alignment dynamics contribute to almost all the physical properties of liquid crystals, which forms the basis for their broad applicability as a "smart" material. For example, it can serve as a fingerprint of the response time, contrast ratio, and viewing angle characteristics of liquid crystal displays. Much research has focused on revealing the interrelationship between the physical properties of liquid crystals and their alignment, with the core objective of addressing this problem being the measurement of dynamic changes in alignment.

[0003] Rapid measurement of orientation dynamics, reaching the millisecond level in nature, remains a hurdle in this field. Traditional light scattering measurements, including Fourier transform infrared spectroscopy (FTIR), polarized Raman spectroscopy, small-angle X-ray scattering (SAXS), and other optical spectroscopy, require seconds to minutes to obtain a high signal-to-noise ratio signal from multiple scans because the scattered signal is only 10 times the size of the excitation signal. -6 -10 -12 The current limitations of SAXS in measuring dynamic orientation are significant. Even with synchrotron radiation sources, the measurement time of SAXS has recently reached only 3 seconds, which still cannot meet the requirements for millisecond-level response measurements. Therefore, there is an urgent need to design a measurement method that can measure millisecond-level orientation dynamics. Summary of the Invention

[0004] In view of the above-mentioned defects or improvement needs of the existing technology, the present invention provides a rapid measurement method and system for polar material orientation, which can realize millisecond-level measurement of polar material orientation and has strong anti-interference ability.

[0005] To achieve the above objectives, according to one aspect of the present invention, a method for rapidly measuring the orientation degree of a polar material is provided, comprising: obtaining the relative permittivity of the entire polar material to be tested, and the relative permittivity of the polar material to be tested in a first direction and a second direction; obtaining the polarizability of the polar material to be tested in the first direction and the second direction; and obtaining the orientation degree S of the polar material based on the relative permittivity and polarizability using the following orientation degree calculation formula:

[0006]

[0007] Wherein, ε1 is the relative permittivity of the polar material under test in the first direction at the test point; ε2 is the relative permittivity of the polar material under test in the second direction at the test point; ρ is the relative permittivity of the polar material under test as a whole; ρ is the density of the polar material under test; N A It is Avogadro's constant; α is the dielectric constant in vacuum; M is the molar mass of the polar material to be tested; α1 is the polarizability of the polar material to be tested in the first direction at the test point; α2 is the polarizability of the polar material to be tested in the second direction at the test point, and the first and second directions are not parallel.

[0008] Preferably, the first direction and the second direction are perpendicular.

[0009] Preferably, the polar material to be tested is liquid crystal, carbon fiber, or carbon nanotube.

[0010] This application, in another aspect, provides a measurement system for implementing the above-mentioned rapid measurement method for polar material orientation, comprising: at least one set of polar material orientation measurement devices, each set of polar material orientation measurement devices including two interdigitated electrodes, a dielectric anisotropy measurement module, and a polar material orientation calculation module; wherein, one interdigitated electrode is used to measure the relative permittivity in a first direction of the test point, and the other interdigitated electrode is used to measure the relative permittivity in a second direction of the test point; the dielectric anisotropy measurement module is used to transmit the relative permittivity in the first direction and the relative permittivity in the second direction of the test point to the polar material orientation calculation module; the polar material orientation calculation module is used to calculate the orientation degree S of the polar material at the test point based on the following orientation calculation formula:

[0011]

[0012] Wherein, ε1 is the relative permittivity of the polar material under test in the first direction at the test point; ε2 is the relative permittivity of the polar material under test in the second direction at the test point; ρ is the relative permittivity of the polar material under test as a whole; ρ is the density of the polar material under test; N A It is Avogadro's constant; α is the dielectric constant in vacuum; M is the molar mass of the polar material to be tested; α1 is the polarizability of the polar material to be tested in the first direction at the test point; α2 is the polarizability of the polar material to be tested in the second direction at the test point. The two interdigitated electrodes are arranged in non-parallel directions.

[0013] Preferably, when there are multiple sets of polar material orientation measurement devices, the multiple sets of polar material orientation measurement devices are evenly arranged or arranged in an array on the surface to be measured.

[0014] Preferably, the polar material orientation measurement device further includes a substrate, the interdigitated electrodes are disposed on the substrate, the interdigitated electrodes are made of a conductive material, and the substrate is made of glass, FR4, or polyimide.

[0015] Preferably, the two interdigitated electrodes are perpendicular to each other.

[0016] In summary, compared with the prior art, the method and system for rapid measurement of polar material orientation provided by the present invention have the following advantages:

[0017] 1. The applicant of this application has discovered that polar materials have low dielectric loss and concentrated signals. Therefore, when using the polar material orientation degree calculation module in this application to calculate the orientation degree, it is only necessary to measure the relative permittivity and conventional physical property parameters. There is no need to integrate over time, which greatly improves the measurement speed and can achieve millisecond-level measurement.

[0018] 2. The interdigitated electrode structure of this application is simple, and the single-sided contact measurement of the polymer is convenient to install. The measurement based on dielectric anisotropy has high accuracy and fast response. Furthermore, combined with the liquid crystal orientation calculation module of this application, various liquid crystal orientation measurements can be obtained, which is especially suitable for the working state of liquid crystal in a fast-response electric field.

[0019] 3. The unit for rapid measurement of polar material orientation in this application can be arranged in an array, thereby enabling the measurement of orientation across the entire surface, which greatly improves measurement efficiency and accuracy.

[0020] 4. The melting points of the interdigitated electrode material and the substrate material in this application are significantly higher than those of the liquid crystal material, and the structure is stable, which can maintain uniform stability for a long time.

[0021] 5. The measurement method in this application is simple in steps, obtains liquid crystal orientation degree based on dielectric anisotropy, is accurate in measurement, is not easily affected by the external environment, and has high stability and strong universality.

[0022] 6. The unit in this application can be installed on the inner wall of a polar material structure with a complex surface structure, and is not affected by the geometry of the polar material structure. It has high flexibility and wide adaptability. At the same time, it can realize non-destructive online detection of the polar material orientation degree and has high precision, that is, it can accurately measure the orientation degree. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the rapid measurement system for polar material orientation according to an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the structure of the substrate and interdigitated electrodes in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the structure of two interdigitated electrodes perpendicular to each other in an embodiment of this application;

[0026] Figure 4This is a schematic diagram illustrating the application scenario of the interdigitated electrode in the embodiments of this application.

[0027] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0028] 100 - Interdigitated electrode; 200 - Dielectric anisotropy measurement module; 300 - Polar material orientation calculation module; 400 - Substrate; 500 - DC power supply; 600 - LCD display box; 700 - Inner wall of LCD display box glass. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0030] The present invention provides a rapid method for measuring the orientation degree of polar materials, comprising:

[0031] Obtain the overall relative permittivity of the polar material under test, as well as the relative permittivity of the polar material under test in the first and second directions;

[0032] Obtain the polarizability of the polar material under test in the first and second directions;

[0033] The orientation degree S of the polar material is obtained using the following formula based on the relative permittivity and polarizability:

[0034]

[0035] Wherein, ε1 is the relative permittivity of the polar material under test in the first direction at the test point; ε2 is the relative permittivity of the polar material under test in the second direction at the test point; ρ is the relative permittivity of the polar material under test as a whole; ρ is the density of the polar material under test; N A It is Avogadro's constant; α is the dielectric constant in vacuum; M is the molar mass of the polar material to be tested; α1 is the polarizability of the polar material to be tested in the first direction at the test point; α2 is the polarizability of the polar material to be tested in the second direction at the test point, and the first and second directions are not parallel.

[0036] The above formula eliminates the need for integration to measure orientation, greatly improving measurement speed and enabling millisecond-level measurements.

[0037] In a further preferred embodiment, the first direction and the second direction are perpendicular, so that the orientation degree of the polar material to be tested at the point can be obtained based on the parameters of the horizontal and vertical directions or the axial and radial directions at the point to be tested. The parameters are easy to obtain and easy to calculate.

[0038] The calculation method in this application is mainly used for polar materials, such as liquid crystals, carbon fibers, or carbon nanotubes.

[0039] The second aspect of this application provides a measurement system for implementing the above-described method for rapid measurement of polar material orientation, the system comprising at least one set of polar material orientation measurement devices.

[0040] like Figure 1 As shown, each set of polar material orientation measurement devices includes two interdigitated electrodes 100, a dielectric anisotropy measurement module 200, and a polar material orientation calculation module 300. One interdigitated electrode 100 is used to measure the relative permittivity in a first direction at the test point, and the other interdigitated electrode 100 is used to measure the relative permittivity in a second direction at the test point. The dielectric anisotropy measurement module 200 transmits the relative permittivity in the first direction and the relative permittivity in the second direction at the test point to the polar material orientation calculation module 300. The polar material orientation calculation module 300 calculates the orientation degree S of the polar material at the test point based on the following orientation calculation formula:

[0041]

[0042] Wherein, ε1 is the relative permittivity of the polar material under test in the first direction at the test point; ε2 is the relative permittivity of the polar material under test in the second direction at the test point; ρ is the relative permittivity of the polar material under test as a whole; ρ is the density of the polar material under test; N A It is Avogadro's constant; α is the dielectric constant in vacuum; M is the molar mass of the polar material to be tested; α1 is the polarizability of the polar material to be tested in the first direction at the test point; α2 is the polarizability of the polar material to be tested in the second direction at the test point. The two interdigitated electrodes 100 are arranged in non-parallel directions.

[0043] In a further preferred embodiment, the polar material orientation measurement device further includes a substrate 400, such as... Figure 2 and Figure 3 As shown, the interdigitated electrode 100 is disposed on the substrate 400. Since the interdigitated electrode needs to be in contact with the polar material, the melting point of the interdigitated electrode material must be higher than that of the polar material.

[0044] The interdigitated electrode 100 is made of a conductive material (such as indium tin oxide (ITO), brass, etc.), and the substrate 400 is made of rigid glass, FR4, or flexible polyimide.

[0045] In a further preferred embodiment, when there are multiple sets of the polar material orientation measurement device, the multiple sets of polar material orientation measurement devices are evenly arranged or arranged in an array on the surface to be measured. This allows for the measurement of orientation at multiple points on the entire surface, thereby achieving the measurement of orientation across the entire surface.

[0046] When using the rapid polarity material orientation measurement system of this application to measure orientation, the main steps include S1 and S2. For example... Figure 4 As shown, this embodiment uses a liquid crystal display box 600 to measure the alignment degree of the liquid crystal in an applied electric field. In this embodiment, the liquid crystal material is selected as polypentylbiphenyl nitrile liquid crystal (5CB), and a DC power supply of 500 is used to apply voltage. This method of driving liquid crystal alignment has the characteristics of extremely fast speed (millisecond level).

[0047] S1: Arrange the interdigitated electrode 100 on the inner wall of the polar material, and make the interdigitated electrode 100 protrude from the inner wall of the polar material;

[0048] When the polar material is liquid crystal, such as Figure 4 As shown, the interdigitated electrodes are mounted on the inner wall 700 of the liquid crystal display cell glass, with the interdigitated electrodes 100 protruding from the inner wall 700. Specifically, conductive glass can be used, and machining is performed to leave only the interdigitated electrode area for conductivity, so that the surface of the interdigitated electrodes 100 slightly protrudes from the surface of the substrate. Specifically, at least two pairs of mutually perpendicular interdigitated electrodes are mounted on the inner wall of the liquid crystal display cell 600, ensuring that the sensor interdigitated electrodes are in contact with the 5CB liquid crystal when the DC power supply 500 applies voltage.

[0049] Then, the voltage application step is performed so that the interdigitated electrode 100 contacts the 5CB liquid crystal under test. The switching on and off of the DC power supply 500 creates an electric field between the two electrodes with applied voltage. The 5CB is oriented under the drive of the electric field, and the measured dielectric constant value changes accordingly.

[0050] According to the preset sampling period, the output dielectric value of the dielectric anisotropy measurement module 200 is collected at regular intervals to obtain the dielectric anisotropy of the liquid crystal in two directions at the measurement point.

[0051] S2: Based on the relative permittivity collected by the interdigitated electrodes, the orientation degree at the corresponding point is calculated using the polar material orientation degree calculation module 300.

[0052] When multiple polar material orientation measurement devices are used, the orientation degree at multiple points can be obtained simultaneously.

[0053] Furthermore, since dielectric tensor can obtain more liquid crystal orientation information, multiple pairs of interdigitated electrodes can be arranged to measure the liquid crystal orientation degree in different directions. When n is greater than 2, information in multiple positions or directions can be obtained, such as 0°, 45°, 90°, 135°, etc.

[0054] In summary, the rapid measurement method and system for polar material orientation provided by this invention can measure the orientation of liquid crystals in multiple directions, has strong anti-interference ability, and is very suitable for industrial preparation and application.

[0055] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rapid method for measuring the orientation degree of polar materials, characterized in that, include: The relative permittivity of the polar material under test as a whole, and the relative permittivity of the polar material under test in the first and second directions are obtained; the polar material under test is a liquid crystal. Obtain the polarizability of the polar material under test in the first and second directions; The orientation degree of the polar material is obtained based on the relative permittivity and polarizability using the following orientation degree calculation formula. S : in, Let be the relative permittivity of the polar material under test in the first direction at the test point; Let be the relative permittivity of the polar material under test in the second direction at the test point; Let be the overall relative permittivity of the polar material under test; The density of the polar material to be tested; It is Avogadro's constant; The dielectric constant in a vacuum; denoted as the molar mass of the polar material to be tested; The polarizability of the polar material under test in the first direction at the test point; Let be the polarizability of the polar material to be tested in the second direction at the test point, where the first direction and the second direction are perpendicular.

2. A rapid measurement system for the orientation degree of polar materials, characterized in that, include: At least one set of polar material orientation degree measuring devices, each set of polar material orientation degree measuring devices including two interdigitated electrodes (100), a dielectric anisotropy measuring module (200), and a polar material orientation degree calculation module (300); wherein, one interdigitated electrode (100) is used to measure the relative permittivity in a first direction of the test point, and the other interdigitated electrode (100) is used to measure the relative permittivity in a second direction of the test point; the dielectric anisotropy measuring module (200) is used to transmit the relative permittivity in the first direction and the relative permittivity in the second direction of the test point to the polar material orientation degree calculation module (300); the polar material orientation degree calculation module (300) is used to calculate the orientation degree of the polar material at the test point based on the following orientation degree calculation formula. S : in, Let be the relative permittivity of the polar material under test in the first direction at the test point; Let be the relative permittivity of the polar material under test in the second direction at the test point; Let be the overall relative permittivity of the polar material under test; The density of the polar material to be tested; It is Avogadro's constant; The dielectric constant in a vacuum; Let be the molar mass of the polar material to be tested; The polarizability of the polar material under test is located in the first direction at the test point. The polarizability of the polar material to be tested is the polarizability in the second direction of the test point. The two interdigitated electrodes (100) are arranged perpendicularly to each other. The polar material to be tested is a liquid crystal.

3. The measurement system according to claim 2, characterized in that, When there are multiple sets of polar material orientation measurement devices, the multiple sets of polar material orientation measurement devices are evenly arranged on the surface to be measured.

4. The measurement system according to claim 2, characterized in that, When there are multiple sets of polar material orientation measurement devices, the multiple sets of polar material orientation measurement devices are arranged in an array on the surface to be measured.

5. The measurement system according to any one of claims 2 to 4, characterized in that, The polar material orientation measurement device further includes a substrate (400), the interdigitated electrode (100) is disposed on the substrate (400), the material of the interdigitated electrode (100) is a conductive material, and the material of the substrate (400) is glass, FR4 or polyimide.

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