A dendrimeric fluorescent liquid crystal polymer with aggregation-induced emission properties and a preparation method thereof

Abstract

The present invention aims to provide a new method for preparing dendritic fluorescent liquid crystalline polymers with aggregation-induced emission (AIE) properties. First, dendritic fluorescent monomer molecule I with AIE effect is synthesized in the present invention, and then the corresponding dendritic fluorescent liquid crystalline polymer II is synthesized by a free radical polymerization method. Such dendritic fluorescent liquid crystalline polymers not only have excellent fluorescence properties, but also can rely on the "steric volume effect" of the side groups to form a liquid crystal structure together with the main chain and exhibit the characteristic of re-entrant phase. The dendritic fluorescent liquid crystalline polymer material of the present invention has high temperature resistance, excellent solid-state luminescence properties, rich self-assembly behaviors, good optoelectronic properties and processing properties. Therefore, it has potential application values in the fields of display, sensing, multifunctional optoelectronic materials, etc.

Description

Technical Field

[0001] The present invention belongs to the technical field of organic light-emitting materials, and particularly relates to a dendritic fluorescent liquid crystal polymer with aggregation-induced emission characteristics and a preparation method thereof. Background Art

[0002] Traditional chromophores will produce the aggregation-induced fluorescence quenching (ACQ) effect due to intermolecular aggregation behavior in the solid state or thin film state, which hinders the development of light-emitting liquid crystal materials. In response to this, many research groups have proposed strategies including introducing bulky groups, physical doping, and passivation. However, although these attempts have achieved some positive effects, they still cannot fundamentally solve the contradiction between the supramolecular ordered packing required for the formation of the liquid crystal phase and the aggregation-induced fluorescence quenching. However, in 2001, the aggregation-induced emission (AIE) effect proposed by the research group of Benzhong Tang provided a platform for the development of light-emitting liquid crystals. Subsequently, a large number of AIE molecules were discovered and studied, making the fluorescent liquid crystal materials based on AIE molecules a research hotspot. However, since AIE chromophores are usually spatially distorted, it is difficult to meet the requirements of the planar rigid structure of liquid crystal units even in the aggregated state. Therefore, the preparation of fluorescent liquid crystal materials with AIE characteristics is very challenging. Compared with small molecule liquid crystals, the construction methods of liquid crystal polymers are more abundant. Among them, dendritic side-chain liquid crystal polymer systems often do not contain traditional liquid crystal units, and rely on the "steric effect" caused by side groups to induce the formation of liquid crystal phases in polymer materials. At the same time, the size, shape, surface functional groups, etc. of the dendritic structure can be precisely controlled. Therefore, the present invention combines the AIE effect with the dendritic side-chain liquid crystal polymer system, which not only avoids the disadvantage that AIE chromophores are difficult to become liquid crystal groups, but also can regulate the self-assembly behavior and fluorescence properties of the polymer. Therefore, the dendritic fluorescent liquid crystal material has the advantages of high temperature resistance, excellent solid-state luminescence performance, rich self-assembly behavior, good optoelectronic properties and processing performance. Thus, it has potential application value in the fields of display, sensing, multifunctional optoelectronic materials, etc. Summary of the Invention

[0003] The purpose of the present invention is to provide a new method for preparing a dendritic fluorescent liquid crystal polymer with aggregation-induced emission characteristics. The present invention first synthesizes a dendritic fluorescent monomer molecule I with AIE effect, and further polymerizes the dendritic fluorescent monomer molecule I by a free radical polymerization method to obtain a dendritic fluorescent liquid crystal polymer II with AIE characteristics. The present invention aims to reasonably utilize the "steric effect" of dendritic side groups, combine the AIE effect with the dendritic side-chain liquid crystal polymer system, and prepare a dendritic fluorescent liquid crystal material with the advantages of high temperature resistance, excellent solid-state luminescence performance, rich self-assembly behavior, good optoelectronic properties and processing performance.

[0004] The technical solution of the process of the present invention is as follows:

[0005] A preparation method of a dendritic fluorescent liquid crystal polymer with aggregation-induced emission properties, characterized in that it contains dendritic side chains with aggregation-induced emission effects at the para and meta positions (relative to the main chain) of the benzene ring. Driven by the "spatial volume effect" of the side chains, the main and side chains act together to construct a liquid crystal structure, and its structural formula is shown in Formula I:

[0006]

[0007] Ⅰ

[0008] In the formula, R 1 is one of the structural formulas in Formula II, and the free "-" are all connecting ends. n is an integer from 20 to 1200.

[0009] Ⅱ

[0010] R 2 is (CH 2 ) m , (CH 2 -CH 2 -O) m , (CH 2 -CH 2 ) m O-, -CH 2 C 6 H 5 O(CH 2 ) m O- and 0 ≤ m ≤ 12

[0011] R 3 represents one or more of the groups with aggregation-induced emission effects shown in Formula III:

[0012]

[0013] Ⅲ

[0014] R 4 、R 5 、R 6 are H, (CH 2 ) m , O(CH 2 ) m , OC*(CH 2 ) m CH 3 (C* is a chiral atom), C≡CH, CH=CH 2 , OH, CN, CHO, NO 2 , SO 3 , NH 2One of the groups, and 0 ≤ m ≤ 12.

[0015] The preparation method of a dendritic fluorescent liquid crystal polymer with aggregation-induced emission characteristics, which is characterized by the following operating steps:

[0016]

[0017] Ⅳ

[0018] The structural formula of the dendritic fluorescent monomer molecule Ⅰ with aggregation-induced emission effect is shown in Formula Ⅳ: In the formula, R 2 , R 3 has the same meaning as above; by using the method of free radical polymerization, under the condition of 30~130 °C, the dendritic fluorescent monomer molecule Ⅰ undergoes a polymerization reaction to obtain a dendritic fluorescent liquid crystal polymer Ⅱ with AIE effect.

[0019] The said free radical polymerization method is ordinary free radical polymerization and controlled / "living" free radical polymerization, where the controlled / "living" free radical polymerization includes: nitroxide-mediated polymerization, initiator-transfer-terminator method, atom transfer radical polymerization, reversible addition-fragmentation chain transfer method.

[0020] The initiator of the said ordinary free radical polymerization method is one of azobisisobutyronitrile (AlBN), benzoyl peroxide (BPO), and azobisisoheptonitrile.

[0021] The initiator of the said nitroxide-mediated polymerization method is one of azobisisobutyronitrile (AlBN), benzoyl peroxide (BPO), and azobisisoheptonitrile (ABVN), and the nitroxide stable free radical is 2,2,6,6-tetramethyl-1-oxylpiperidine (TEMPO).

[0022] The initiator-transfer-terminator of the said initiator-transfer-terminator method is one of tetraphenylbutanedinitrile (TPSN) and pentaphenylethane.

[0023] The initiator of the said atom transfer radical polymerization method is one of ethyl 2-bromopropionate and ethyl 2-bromoisobutyrate, the ligand agent is one of 2,2'-bipyridine and N-(1-propyl)-2-pyridinecarboxaldehydeimine, and the transition metal salt catalyst is one of cuprous chloride and ferrous chloride.

[0024] The initiator of the said reversible addition-fragmentation chain transfer method is one of azobisisobutyronitrile and benzoyl peroxide, and the chain transfer agent is one of S-1-phenylethyl 2-thiophenecarboxylate, trithiocarbonate, and aryl dithiocarbamate.

[0025] The present invention has the following technical effects:

[0026] In the present invention, a space-twisted aggregation-induced emission (AIE) effect molecule is introduced into a dendritic side-chain liquid crystal polymer system. By reasonably utilizing the "space volume effect" of the dendritic side groups, while overcoming the difficulty of AIE molecules in becoming liquid crystal units, the main and side chains jointly construct a liquid crystal structure with rich self-assembly behaviors. The dendritic fluorescent liquid crystal material prepared by this method has good thermal stability, excellent solid-state luminescence performance, rich self-assembly behaviors, good optoelectronic properties and processing properties. Therefore, it has potential application values in the fields of display, sensing, multifunctional optoelectronic materials, etc. Description of the Drawings

[0027] Figure 1 1H NMR spectrum of the dendritic fluorescent monomer M-1 with aggregation-induced emission effect in Example 1 of the present invention.

[0028] Figure 2 GPC chart of the dendritic fluorescent liquid crystal polymer P-1 with aggregation-induced emission characteristics synthesized in Example 1 of the present invention during the heating process.

[0029] Figure 3 POM charts of the dendritic fluorescent liquid crystal polymer P-1 with aggregation-induced emission characteristics synthesized in Example 1 of the present invention at 150 °C (a), 205 °C (b), and 280 °C (c), respectively, indicating that the polymer has the characteristic of re-entrant phase.

[0030] Figure 4 Fluorescence spectra of the dendritic fluorescent liquid crystal polymer P-1 with aggregation-induced emission characteristics synthesized in Example 1 of the present invention in a mixed solution of water and tetrahydrofuran with different water contents (concentration: 1×10^ -6 mol / ml), indicating that the polymer has aggregation-induced emission performance.

[0031] Figure 5 Relative fluorescence emission intensities of the dendritic fluorescent liquid crystal polymer P-1 with aggregation-induced emission characteristics synthesized in Example 1 of the present invention in a mixed solution of water and tetrahydrofuran with different water contents (concentration: 1×10^ -6 mol / ml), indicating that the fluorescence intensity of the polymer increases with the increase of water content. Detailed Description of the Invention

[0032] In combination with implementation examples, the implementation manners of the present invention will be described in detail. However, the technical scope of the present invention is not limited to the following implementation manners. Without changing the key points, various changes can be made for implementation. To avoid obscuring the present invention with unnecessary details, the term "including", "comprising" or any variant thereof encompasses non-exclusive inclusion, such that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes other elements for such process, method, article or device.

[0033] Example 1

[0034] A dendritic fluorescent liquid crystal polymer with aggregation-induced emission properties, and its structural formula is shown as Formula V:

[0035]

[0036] Ⅴ

[0037] The preparation method is as follows:

[0038] Raw materials: monomer 3,4,5-tris[2-(4-oxotetraphenylethylene)-decyloxy]styrene, petroleum ether, azobisisobutyronitrile (AlBN), azobisisoheptonitrile, benzoyl peroxide, dithiocarbamic acid, ethyl bromopropionate, cuprous chloride, 2,2'-bipyridine, trithiocarbonate, 2,2,6,6-tetramethyl-1-oxylpiperidine.

[0039] (1) Conventional radical polymerization

[0040] Add AlBN, 3,4,5-tris[2-(4-oxotetraphenylethylene)-decyloxy]styrene and a magnet (the molar ratio of monomer to initiator is 100:1) into a clean polymerization tube. After four cycles of liquid nitrogen freezing - vacuum pumping - thawing - nitrogen purging, seal the tube under vacuum. Place the test tube in an 80°C oil bath. After reacting for 12.5 h, put the polymerization tube into ice water to quickly stop the polymerization by using low temperature. Open the polymerization tube and add a small amount of tetrahydrofuran solution for dilution. Take out the solution and slowly drop it into petroleum ether solvent for precipitation to remove the monomer. Filter by suction, collect the polymer, and then dissolve it with a small amount of tetrahydrofuran and perform precipitation again. This process needs to be repeated multiple times until no monomer is detected by GPC and nuclear magnetic resonance. Finally, dry the polymer in a 40°C vacuum drying oven to obtain the target polymer.

[0041] (2) Nitroxide-mediated radical polymerization

[0042] A magnet, 2,2,6,6-tetramethyl-1-oxylpiperidine, benzoyl peroxide and monomer 3,4,5-tris[2-(4-oxotetraphenylethylene)-decyloxy]styrene were added into a clean polymerization tube (the molar ratio of 2,2,6,6-tetramethyl-1-oxylpiperidine: benzoyl peroxide: monomer was 1:1.2:100). After four cycles of liquid nitrogen freezing - vacuum pumping - thawing - nitrogen purging, the tube was sealed under vacuum. After reacting at 80 °C for 13 h, the polymerization tube was placed in ice water to rapidly stop the polymerization by using low temperature. The polymerization tube was opened and a small amount of tetrahydrofuran solution was added for dilution. The solution was taken out and slowly dropped into petroleum ether solvent for precipitation to remove the monomer. After centrifugally collecting the polymer, it was dissolved in a small amount of tetrahydrofuran and precipitated again. This process was repeated multiple times until no monomer was detected by GPC and NMR. Finally, the polymer was dried in a vacuum drying oven at 40 °C to obtain the target polymer.

[0043] (3) Initiator transfer termination method

[0044] A magnet, tetraphenylsuccinonitrile and monomer 3,4,5-tris[2-(4-oxotetraphenylethylene)-decyloxy]styrene (the molar ratio of initiator: monomer was 1:100) were added into a clean polymerization tube. After four cycles of liquid nitrogen freezing - vacuum pumping - thawing - nitrogen purging, the tube was sealed under vacuum. After reacting at 80 °C for 12 h, the polymerization tube was placed in ice water to rapidly stop the polymerization by using low temperature. The polymerization tube was knocked open and a small amount of tetrahydrofuran solution was added for dilution. The solution was taken out and slowly dropped into petroleum ether solvent for precipitation to remove the monomer. After centrifugally collecting the polymer, it was dissolved in a small amount of tetrahydrofuran and precipitated again. This process was repeated multiple times until no monomer was detected by GPC and NMR. Finally, the polymer was dried in a vacuum drying oven at 40 °C to obtain the target polymer.

[0045] (4) Atom transfer radical polymerization

[0046] Ethyl 2-bromopropionate, cuprous chloride, 2,2'-bipyridine, monomer 3,4,5-tris[2-(4-oxotetraphenylethylene)-decyloxy]styrene (the molar ratios were respectively: 1:1:2:100) and the washed magnet were added into a dry polymerization tube. After four cycles of liquid nitrogen freezing - vacuum pumping - thawing - nitrogen purging, the tube was sealed under vacuum. After reacting at 80 °C for 12 h, the polymerization tube was placed in ice water to rapidly stop the polymerization by using low temperature. The polymerization tube was knocked open and a small amount of tetrahydrofuran solution was added for dilution. The solution was taken out and precipitated with petroleum ether solvent, and passed through a column filled with activated Al 2 O 3The copper ions in the system were removed by the glass column. After multiple washings and centrifugations, the polymer was placed in a vacuum drying oven at 40 °C for drying to obtain the target polymer.

[0047] (5)Reversible addition-fragmentation chain transfer method

[0048] Azobisisobutyronitrile, trithiocarbonate, monomer 3,4,5-tris[2-(4-oxotetraphenylethylene)-decyloxy]styrene (molar ratios were 1:3:100 respectively), and a magnet were added to a clean polymerization tube. After four cycles of liquid nitrogen freezing - vacuum pumping - thawing - nitrogen purging, the tube was sealed under vacuum. After reacting at 80 °C for 12 h, the polymerization tube was placed in ice water to rapidly stop the polymerization by low temperature. The polymerization tube was opened and a small amount of tetrahydrofuran solution was added for dilution. The solution was taken out and slowly dropped into petroleum ether solvent for precipitation to remove the monomer. After centrifuging to collect the polymer, it was dissolved in a small amount of tetrahydrofuran and precipitated again. This process was repeated multiple times until no monomer was detected by GPC and NMR. Finally, the polymer was placed in a vacuum drying oven at 40 °C for drying to obtain the target polymer.

[0049] Figure 1 1H NMR spectrum of monomer 3,4,5-tris[2-(4-oxotetraphenylethylene)-decyloxy]styrene (M-1). Through analysis, it can be seen that the dendritic fluorescent monomer and the corresponding polymer were successfully synthesized. Figure 2 This is the GPC characterization diagram of the polymer. Its molecular weight is 153,600 and the PDI is 1.34, indicating that a high polymer with a large molecular weight and a narrow distribution was synthesized. Figure 3 These are the POM diagrams of the dendritic fluorescent liquid crystal polymer at 150 °C (a), 205 °C (b), and 280 °C (c) respectively, indicating that the polymer has the characteristic of re-entrant phase. Figure 4 This is the fluorescence spectrum of the dendritic fluorescent liquid crystal polymer in a water and tetrahydrofuran mixed solution with different water contents (concentration: 1×10^ -6 mol / ml). In pure tetrahydrofuran solution, its fluorescence emission is very weak and almost does not emit light. However, when the water content is greater than 80%, the polymer emits bright blue fluorescence in the mixed solvent. This indicates that the polymer has the property of aggregation-induced emission. Figure 5 This is the relative fluorescence emission intensity of the dendritic fluorescent liquid crystal polymer in a water and tetrahydrofuran mixed solution with different water contents (concentration: 1×10^ -6 mol / ml), indicating that the fluorescence intensity of the polymer increases with the increase of water content. When the water content is 95%, the fluorescence intensity is about 32 times that in the tetrahydrofuran solution.

[0050] Example 2

[0051] A dendritic fluorescent liquid crystal polymer with aggregation-induced emission properties, and its structural formula is shown in Formula VI:

[0052]

[0053] VI

[0054] The preparation method is as follows:

[0055] Raw materials: monomer phenyl 3,4,5-tris[2-(4-oxocyanostyryl)-butoxy]methacrylate, petroleum ether, azobisisobutyronitrile (AlBN), azodiisovaleronitrile, benzoyl peroxide, dithiocarbamic acid, ethyl bromopropionate, copper chloride, 2,2'-bipyridine, trithiocarbonate, 2,2,6,6-tetramethyl-1-oxylpiperidine.

[0056] (1) Ordinary radical polymerization

[0057] Add AlBN, monomer phenyl 3,4,5-tris[2-(4-oxocyanostyryl)-butoxy]methacrylate and a magnet (molar ratio of monomer to initiator is 100:1) into a clean polymerization tube. After four cycles of liquid nitrogen freezing - vacuum pumping - thawing - nitrogen purging, seal the tube under vacuum. Place the test tube in an 80°C oil bath and react for 12.5 h. Then, place the polymerization tube in ice water to quickly stop the polymerization by low temperature. Open the polymerization tube and add a small amount of tetrahydrofuran solution for dilution. Take out the solution and slowly drip it into petroleum ether solvent for precipitation to remove the monomer. Filter by suction, collect the polymer, and then dissolve it in a small amount of tetrahydrofuran and precipitate again. This process needs to be repeated multiple times until no monomer is detected by GPC and NMR. Finally, place the polymer in a 40°C vacuum drying oven for drying to obtain the target polymer.

[0058] (2) Nitroxide-mediated radical polymerization method

[0059] Add a magnet, 2,2,6,6-tetramethyl-1-oxylpiperidine, benzoyl peroxide and the monomer phenyl 3,4,5-tris[2-(4-oxocyanostyryl)butoxy]methacrylate (molar ratio of 2,2,6,6-tetramethyl-1-oxylpiperidine: benzoyl peroxide: monomer is 1:1.2:100) into a clean polymerization tube. After four cycles of liquid nitrogen freezing - vacuum pumping - thawing - nitrogen purging, seal the tube under vacuum. React at 80 °C for 13 h, then put the polymerization tube into ice water to rapidly stop the polymerization by using low temperature. Open the polymerization tube and add a small amount of tetrahydrofuran solution for dilution. Take out the solution and slowly drop it into petroleum ether solvent for precipitation to remove the monomer. After centrifuging to collect the polymer, dissolve it with a small amount of tetrahydrofuran and then precipitate it again. This process needs to be repeated multiple times until no monomer is detected by GPC and NMR. Finally, dry the polymer in a vacuum drying oven at 40 °C to obtain the target polymer.

[0060] (3) Initiator transfer termination method

[0061] Add a magnet, tetraphenylsuccinonitrile and the monomer phenyl 3,4,5-tris[2-(4-oxocyanostyryl)butoxy]methacrylate (molar ratio of initiator: monomer is 1:100) into a clean polymerization tube. After four cycles of liquid nitrogen freezing - vacuum pumping - thawing - nitrogen purging, seal the tube under vacuum. React at 80 °C for 12 h, then put the polymerization tube into ice water to rapidly stop the polymerization by using low temperature. Knock open the polymerization tube and add a small amount of tetrahydrofuran solution for dilution. Take out the solution and slowly drop it into petroleum ether solvent for precipitation to remove the monomer. After centrifuging to collect the polymer, dissolve it with a small amount of tetrahydrofuran and then precipitate it again. This process needs to be repeated multiple times until no monomer is detected by GPC and NMR. Finally, dry the polymer in a vacuum drying oven at 40 °C to obtain the target polymer.

[0062] (4) Atom transfer radical polymerization

[0063] Add ethyl 2-bromopropionate, copper(I) chloride, 2,2'-bipyridine, the monomer phenyl 3,4,5-tris[2-(4-oxocyanostyryl)butoxy]methacrylate (molar ratios are respectively: 1:1:2:100) and a magnet into a clean polymerization tube. After four cycles of liquid nitrogen freezing - vacuum pumping - thawing - nitrogen purging, seal the tube under vacuum. React at 80 °C for 12 h, then put the polymerization tube into ice water to rapidly stop the polymerization by using low temperature. Knock open the polymerization tube and add a small amount of tetrahydrofuran solution for dilution. Take out the solution and precipitate it with petroleum ether solvent, passing through a column filled with activated Al 2 O 3The copper ions in the system were removed by the glass column. After multiple washings and centrifugations, the polymer was placed in a vacuum drying oven at 40 °C for drying to obtain the target polymer.

[0064] (5)Reversible addition-fragmentation chain transfer method

[0065] Azobisisobutyronitrile, trithiocarbonate, monomer 3,4,5-tris[2-(4-oxocyanodistyryl)-butoxy]phenyl methacrylate (molar ratios were 1:3:100 respectively) and a magnet were added to a clean polymerization tube. After four cycles of liquid nitrogen freezing - vacuum pumping - thawing - nitrogen purging, the tube was sealed under vacuum. After reacting at 80 °C for 12 h, the polymerization tube was placed in ice water to rapidly stop the polymerization by using low temperature. The polymerization tube was opened and a small amount of tetrahydrofuran solution was added for dilution. The solution was taken out and slowly dropped into petroleum ether solvent for precipitation to remove the monomer. After centrifuging to collect the polymer, it was dissolved in a small amount of tetrahydrofuran and precipitated again. This process was repeated multiple times until no monomer was detected by GPC and NMR. Finally, the polymer was placed in a vacuum drying oven at 40 °C for drying to obtain the target polymer.

Claims

1. A dendritic fluorescent liquid crystal polymer with aggregation-induced emission properties, characterized in that, relative to the main chain, dendritic side chains with aggregation-induced emission effects are contained at the para and meta positions of the benzene ring. Driven by the "spatial volume effect" of the side chains, the main and side chains jointly act to construct a liquid crystal structure, and its structural formula is shown in Formula I: Wherein, R 1 is one of the structural formulas II, the free "—" are all connecting ends, and n is an integer from 20 to 1200; R 2 is -CH 2 C 6 H 5 O(CH 2 ) m O- of one kind, and 0 ≤ m ≤ 12; R 3 One or more of the groups with aggregation-induced emission effect shown in Formula III: R 4 、R 5 、R 6 are H, OC*(CH 2 ) m CH 3 , C≡CH, CH=CH 2 , OH, CN, CHO, NO 2 , SO 3 H, NH 2 one of the groups, and 0 ≤ m ≤ 12; wherein, C* is a chiral carbon atom.

2. The dendritic fluorescent liquid crystal polymer with aggregation-induced emission properties according to Claim 1, characterized in that, the preparation method of the polymer adopts the following operating steps: (1) The structural formula of the dendritic fluorescent monomer molecule I with aggregation-induced emission effect is shown in Formula IV, where the meanings of R 2 and R 3 are the same as those described above; (2) By using the method of free radical polymerization, under the condition of 30-130 °C, the dendritic fluorescent monomer molecule I undergoes a polymerization reaction to obtain the corresponding dendritic fluorescent liquid crystal polymer II.

3. The dendritic fluorescent liquid crystal polymer with aggregation-induced emission properties according to Claim 2, characterized in that: the method of free radical polymerization is ordinary free radical polymerization and controlled / "living" free radical polymerization, and the controlled / "living" free radical polymerization includes: nitroxide-mediated radical polymerization, initiator-transfer-terminator method, atom transfer radical polymerization, reversible addition-fragmentation chain transfer method.

4. The dendritic fluorescent liquid crystal polymer with aggregation-induced emission properties according to Claim 3, characterized in that: the initiator of the ordinary free radical polymerization method is one of azobisisobutyronitrile (AlBN), benzoyl peroxide (BPO), and azobisisoheptonitrile (ABVN).

5. The dendritic fluorescent liquid crystal polymer with aggregation-induced emission properties according to Claim 3, characterized in that: the initiator of the nitroxide-mediated radical polymerization method is one of azobisisobutyronitrile (AlBN), benzoyl peroxide (BPO), and azobisisoheptonitrile (ABVN), and the nitroxide stable radical is 2,2,6,6-tetramethyl-1-oxylpiperidine (TEMPO).

6. The dendritic fluorescent liquid crystal polymer with aggregation-induced emission properties according to Claim 3, characterized in that: the initiator-transfer-terminator of the initiator-transfer-terminator method is one of tetraphenylbutanedinitrile (TPSN) and pentaphenylethane.

7. The dendritic fluorescent liquid crystal polymer with aggregation-induced emission properties according to Claim 3, characterized in that: atom the initiator of the atom transfer radical polymerization method is one of ethyl 2-bromopropionate and ethyl 2-bromoisobutyrate, the ligand agent is one of 2,2'-bipyridine and N-(1-propyl)-2-pyridinecarboxaldehydeimine, and the transition metal salt catalyst is one of cuprous chloride and ferrous chloride.

8. The dendritic fluorescent liquid crystal polymer with aggregation-induced emission properties according to Claim 3, characterized in that: the initiator of the reversible addition-fragmentation chain transfer method is one of azobisisobutyronitrile and benzoyl peroxide, and the chain transfer agent is one of S-1-phenylethyl 2-thiophenecarboxylate, trithiocarbonate, and aryl dithiocarbamate.

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