Method for preparing conjugated polymer

Abstract

The invention relates to a novel method for preparing a conjugated polymer. A linear or hyperbranched conjugated polymer is prepared by reacting an aryl Grignard reagent with aryl halide. The preparation method comprises the following steps: preparing a corresponding aryl Grignard reagent; and carrying out coupling reaction on the prepared aryl Grignard reagent and a mixed solution of aryl halide tetrahydrofuran at 0-60 DEG C for 4-24 hours, and purifying to obtain the conjugated polymer. The method has the advantages of mild reaction conditions, short reaction time, simple operation and cheap reactants. The preparation method has the advantages that the reaction conditions are mild, the reactant selectivity is high, side reactions are effectively reduced, the structure and molecular weight of the prepared conjugated polymer can be controlled through reaction conditions or copolymerization, and the conjugated polymer has the advantages of high regularity, good conductivity, strong heat resistance, simple process, low cost and the like.

Description

Technical Field

[0001] The invention relates to the field of synthesis technology, and in particular to a method for preparing a conjugated polymer and a preparation method and application thereof. Background Art

[0002] Conjugated polymers are a type of polymers with special photoelectric properties formed by connecting units with conjugated structures. As a new type of functional material, organic conjugated polymers have rich functional properties such as light, electricity, and magnetism. Conjugated polymers have excellent electrical conductivity and strong light capture ability. They can be used to amplify fluorescent sensing signals and play an increasingly important role in disease diagnosis, photovoltaic materials, and biological detection. In recent years, the application of conjugated polymers in fluorescence imaging at the electrode, cell and animal levels, and in the biomedical field has also received great attention.

[0003] However, there are currently very few monomers for conjugated polymers and conjugated polymers with excellent photothermal properties, mainly concentrated in only a few such as polyacetylene, polythiophene, polyaniline, polyphenylene, polypyrrole, etc. And their properties, especially processability, solubility, charge carrier mobility, on / off ratio and stability, still have room for further improvement. The preparation method of conjugated polymers is also relatively simple, and there is room for further improvement to obtain conjugated polymers with better performance and further regulate their performance for application in different fields.

[0004] As a thermoplastic resin with a special structure, conjugated polymers have excellent mechanical properties, solvent resistance, chemical corrosion resistance, heat resistance, strong light capture ability and electrical conductivity. They are mainly used as photovoltaic materials, fluorescent sensor signal amplification materials in the biomedical field, and conductive materials. They are also used in disease diagnosis, biological detection, solar cells, conductive plastics and other fields.

[0005] Based on the needs of industry and practical applications, it is necessary to find a method for synthesizing new conjugated polymers with better performance, simple process and low cost. Summary of the invention

[0006] The purpose of the present invention is to synthesize a linear conjugated polymer by a step-wise polymerization method using a highly selective aromatic di-Grignard reagent and an aromatic dihalide coupling reaction; or to synthesize a hyperbranched conjugated polymer by a step-wise polymerization method using an aromatic tri-Grignard reagent and an aromatic dihalide coupling reaction, or using an aromatic di-Grignard reagent and an aromatic ternary halide coupling reaction. Since the conjugated polymer has excellent thermal stability, mechanical properties and corrosion resistance, it can fill the defects of the existing conjugated polymer and prepare products with better performance. And by introducing an aromatic substituent group or copolymerization reaction, the properties of the conjugated polymer including wettability, affinity, processability, etc. are adjusted.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A method for preparing a conjugated polymer comprises the following steps:

[0009] A. Obtain an aryl Grignard reagent;

[0010] B. The aromatic substituent is dissolved in a reaction solvent, and under the protection of an inert gas, the di-Grignard reagent is added dropwise to carry out a coupling polymerization reaction to obtain a crude product; adding the Grignard reagent dropwise under the protection of an inert gas can prevent the di-Grignard reagent from reacting with oxygen and water in the air, thereby ensuring that the reaction proceeds smoothly.

[0011] C. purifying the crude product to obtain a conjugated polymer;

[0012] The conjugated polymer includes one or more of a linear conjugated polymer and a hyperbranched conjugated polymer.

[0013] The reaction of aryl Grignard reagents with aryl halides has good selectivity and can generate new conjugated polymers with regular structures, make up for the defects of existing conjugated polymers, expand the scope of conjugated polymers, and prepare optoelectronic biomaterials with high performance.

[0014] Preferably, when the conjugated polymer includes a linear conjugated polymer, in step B, the coupling polymerization reaction includes the following general reaction formula:

[0015]

[0016] The phenyl group in the formula also includes the exchange of biphenyl group, naphthyl group or fluorenyl group;

[0017] X=F, Cl, Br, I;

[0018] Y=F, Cl, Br, I;

[0019] Ar includes phenyl, biphenyl, naphthyl, pyridyl, thiophene, and one or more of alkyl, aryl or alicyclic, halogen, sulfonic acid, and nitro groups;

[0020] R' includes one or more of hydrogen, alkyl, aryl or alicyclic group, halogen, sulfonic acid group, and nitro group;

[0021] R" includes one or more of hydrogen, alkyl, aryl or alicyclic group, halogen, sulfonic acid group, and nitro group.

[0022] When preparing a linear conjugated polymer, the aryl Grignard reagent is an aryl di-Grignard reagent, and the aryl di-Grignard reagent includes one or more of phenyl, biphenyl, naphthyl or fluorenyl di-Grignard reagents, and the halogen contained includes one of fluorine, chlorine, bromine and iodine. The di-Grignard reagent can be an aryl di-Grignard reagent containing alkyl, aryl or alicyclic groups, halogen, sulfonic acid group, and nitro substituents on the aromatic ring. The aryl dihalide is one or more of the ortho, para and meta dihalides of phenyl, biphenyl, naphthyl, pyridyl, and thiophene dihalides, and the halogen is one of fluorine, chlorine, bromine and iodine. The phenyl dihalide or biphenyl dihalide can be a phenyl aromatic ring containing alkyl, aryl or alicyclic groups, halogen, sulfonic acid group, and nitro.

[0023] Preferably, when the conjugated polymer includes a hyperbranched conjugated polymer, in step B, the aryl Grignard reagent includes one or more of an aryl bis-Grignard reagent and an aryl tris-Grignard reagent;

[0024] When the aryl Grignard reagent comprises an aryl bis-Grignard reagent, the aromatic substituent comprises an aryl ternary halide;

[0025] When the aryl Grignard reagent comprises an aryl tris-Grignard reagent, the aromatic substituent comprises an aryl dihalide.

[0026] Preferably, in step B, the aromatic group contained in the aromatic double Grignard reagent includes phenyl, biphenyl, naphthyl, fluorenyl, and the aromatic ring thereof contains one or more substitutions of alkyl, aromatic, alicyclic, halogen, sulfonic acid, and nitro; the halogen contained in the aromatic double Grignard reagent includes one or more substitutions of fluorine, chlorine, bromine, and iodine;

[0027] The aromatic groups contained in the aromatic ternary halide include phenyl, biphenyl, naphthyl, pyridyl, thiophene, and the aromatic rings thereof are substituted with one or more of alkyl, aromatic, alicyclic, halogen, sulfonic acid, and nitro groups; the halogen contained in the aromatic ternary halide includes one or more of fluorine, chlorine, bromine, and iodine;

[0028] The aromatic groups contained in the three aryl Grignard reagents include phenyl, biphenyl, naphthyl, fluorenyl, and the aromatic rings thereof contain one or more substitutions of alkyl, aromatic, alicyclic, halogen, sulfonic acid, and nitro groups; the halogen contained in the three aryl Grignard reagents include one or more substitutions of fluorine, chlorine, bromine, and iodine;

[0029] The aromatic dihalide contains aromatic groups including phenyl, biphenyl, naphthyl, pyridyl, thiophene, and its aromatic ring contains one or more substitutions of alkyl, aromatic, alicyclic, halogen, sulfonic acid, and nitro; the halogen includes one or more substitutions of fluorine, chlorine, bromine, and iodine.

[0030] Preferably, the operation of step A comprises: mixing iodine particles, halogenated aromatic hydrocarbons and magnesium powder in a reaction solvent, and heating and performing ultrasonic reaction under the protection of an inert gas to obtain the aromatic Grignard reagent.

[0031] Preferably, in step A, the molar ratio of the halogenated aromatic hydrocarbon to the magnesium powder is 1:3; the reaction temperature of the ultrasonic reaction is 10°C to 60°C, the reaction time is 20 to 60 minutes, and the ultrasonic power is 300 to 1500W.

[0032] Preferably, the inert gas includes one or more of nitrogen and argon; the reaction solvent includes tetrahydrofuran; in step B, the dropping process of the aromatic Grignard reagent includes slow dropping and rapid stirring, and the dropping time includes 0.1 to 1 hour; the reaction temperature of the coupling polymerization reaction includes 0 to 60°C, and the reaction time includes 4 to 24 hours.

[0033] The aromatic Grignard reagent needs to be slowly added and stirred quickly, with a total addition time of 0.1 to 1 hour being appropriate. This can prevent the reaction from being too intense, better control the reaction process, and prevent the occurrence of side reactions that affect the preparation of the conjugated polymer.

[0034] Preferably, the purification treatment in step C includes: adding a quenching agent (alcohol solvent, organic acid or water) to the crude product for quenching, then removing the solvent, washing alternately with water and alcohol solvent in sequence, precipitating in alcohol solvent, and drying to obtain the conjugated polymer; the quenching agent includes one or more of formic acid, acetic acid, butyric acid, methanol, ethanol, butanol, and water, the alcohol solvent includes one or more of methanol, ethanol, and butanol, and the means for removing the solvent includes distilling.

[0035] A conjugated polymer product obtained by the above method for preparing a conjugated polymer.

[0036] The conjugated polymer can be modified by adjusting the feed ratio, raw materials and formula to obtain a modified conjugated polymer to regulate its film-forming property, solubility, heat resistance and mechanical properties.

[0037] The conjugated polymer has good heat resistance and processability, strong light capture ability and electrical conductivity, and is mainly used as photovoltaic materials, fluorescent sensor signal amplification materials in the biomedical field, and conductive materials. It has applications in disease diagnosis, biological detection, solar cells, conductive plastics and other fields.

[0038] An application of the above conjugated polymer product is characterized in that it is used for one or more of luminescence, light capture, conductivity, solar cells, preparation of disease diagnosis equipment or preparations, and preparation of biological detection equipment or preparations.

[0039] The conjugated polymer prepared by the above synthesis method has a controllable structure, and the product is a linear or hyperbranched conjugated polymer with good heat resistance and processability, strong light capture ability and electrical conductivity. The molecular weight, structure and performance can be controlled by feed ratio, reaction time, reaction temperature, and can also be regulated by selecting different substituents or copolymerization.

[0040] The above conjugated polymers are mainly used as photovoltaic materials, fluorescent sensor signal amplification materials in the biomedical field, and conductive materials. They are also used in the fields of disease diagnosis, biological detection, solar cells, conductive plastics, etc.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The present invention relates to a new method for preparing a conjugated polymer, wherein a linear or hyperbranched conjugated polymer is prepared by reacting an aryl Grignard reagent with an aryl halide. The preparation method comprises the following steps: firstly preparing a corresponding aryl Grignard reagent; then subjecting the prepared aryl Grignard reagent to a coupling reaction with a mixed solution of aryl halide tetrahydrofuran, reacting the mixture at 0-60°C for 4-24h, and obtaining a conjugated polymer after purification. The present invention has mild reaction conditions, short reaction time, simple operation, and cheap reactants. The reactant selectivity is high, and the occurrence of side reactions is effectively reduced. The structure and molecular weight of the prepared conjugated polymer can be controlled by reaction conditions or copolymerization, and the conjugated polymer has many advantages such as high regularity, good conductivity, strong heat resistance, simple process, and low cost.

[0043] The present invention can prepare the corresponding aryl Grignard reagent by using aryl halides as raw materials. The prepared aryl Grignard reagent is reacted with a tetrahydrofuran solution of one or more aryl dihalides or aryl ternary halides to prepare a crude conjugated polymer product. After purification, a refined conjugated polymer is obtained.

[0044] The substituent of the aryl halide may be in one or more of the para, ortho or meta positions; the phenyl group may be substituted by a biphenyl group, a naphthyl group or a fluorenyl group, and the aryl halide may also contain one or more substituents such as an alkyl group, an aryl group or an alicyclic group, a halogen group, a sulfonic acid group, a nitro group, etc.;

[0045] The invention can prepare linear or hyperbranched conjugated polymers with high regularity under mild conditions due to the simple preparation process of the aromatic Grignard reagent, high activity and good selectivity. Conjugated polymers with different molecular weights, structures and properties can be prepared by controlling the reaction temperature, time, feed ratio and substrate selection.

[0046] The invention prepares conjugated polymers by using aryl Grignard reagents and aryl halides, and the reaction conditions are mild, and the reaction can be carried out at room temperature and normal pressure, and the reaction time is short; since high temperature and high pressure are not involved, the operation is simple; the reactants are halogenated hydrocarbons, which are easy to purchase, store and transport. The reactants have high selectivity, and linear or hyperbranched conjugated polymers with high regularity are prepared, which have high conductivity, heat resistance and crystallinity. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 The infrared spectrum of poly[5-(9,9-dimethyl-2,7-fluorenylene)-3-hexylthiophene] prepared from 9,9-dimethyl-2,7-dibromofluorene in the present invention;

[0048] Figure 2 The poly{carbonyl-1,4-[bis(1,4-phenylene)]naphthylene} prepared by using 4,4'-dibromobenzophenone of the present invention 1 H-NMR spectrum;

[0049] Figure 3 This is a thermal weight loss curve of poly[2-(2,5-dimethyl-1,4-phenylene)-9-hexylcarbazole] prepared by using 2,7-dibromo-9-hexylcarbazole of the present invention;

[0050] Figure 4 This is the GPC spectrum of poly[5-(2,5-dimethoxy-1,4-phenylene)-3-hexylthiophene] prepared from 2,5-dibromo-3-hexylthiophene in the present invention. DETAILED DESCRIPTION

[0051] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0052] Example 1

[0053] Add 2.36g of p-dibromobenzene, 1 grain of iodine, and 40mL of tetrahydrofuran to a dry Schlenk bottle, evacuate and replace argon three times, and ultrasonically heat at 45℃ for 30min to prepare p-dibromobenzene di-Grignard reagent. Add 5.48g of 9,9-dioctyl-2,7-dibromofluorene, 4.05g of FeCl3, 3.5mL of TEMED, and 60mL of tetrahydrofuran to a dry three-necked flask, evacuate and replace argon three times. Slowly drop p-dibromobenzene di-Grignard reagent into the three-necked flask, stir rapidly, and react at room temperature for 8h. Add 40mL of 36% acetic acid solution to the three-necked flask and stir at room temperature for 1h. Evaporate to dryness by rotary evaporation. Wash with water and methanol, and filter. Add N,N-dimethylformamide to dissolve and precipitate in petroleum ether. Filter and dry. A conjugated polymer is obtained.

[0054] The conjugated polymer prepared in this example has a number average molecular weight of 21430 g / mol and a weight average molecular weight of 44320 g / mol.

[0055] Example 2

[0056] Add 3.58g 1,4-diiodo-2,5-dimethylbenzene, 1 iodine, 30mL tetrahydrofuran to a dry Schlenk bottle, evacuate and replace argon three times, and ultrasonically heat at 30℃ for 25min to prepare 1,4-diiodo-2,5-dimethylbenzene bis-Grignard reagent. Add 4.09g 2,7-dibromo-9-hexylcarbazole, 81.03mg NiCl2(dppp), 60mL tetrahydrofuran to a dry three-necked flask, evacuate and replace argon three times. Slowly drop 1,4-diiodo-2,5-dimethylbenzene bis-Grignard reagent into the three-necked flask, stir rapidly, and react at 50℃ for 24h. Add 40mL 36% formic acid solution to the three-necked flask and stir at room temperature for 1h. Evaporate to dryness by rotary evaporation. Wash with water and ethanol, extract with ethanol for 24h, and dry. Add a small amount of chloroform to dissolve and precipitate in methanol. Filter and dry. A conjugated polymer was obtained.

[0057] The conjugated polymer prepared in this example has a temperature of 423° C. when losing 5% of its weight and a temperature of 522° C. when losing 50% of its weight, and has good heat resistance. The conjugated polymer prepared in this example has a number average molecular weight of 32320 g / mol and a weight average molecular weight of 63245 g / mol.

[0058] Example 3

[0059] Add 3.12g 4,4'-dibromobiphenyl, 1 iodine, 30mL tetrahydrofuran to a dry Schlenk bottle, evacuate and replace argon three times, and ultrasonically heat at 50℃ for 45min to prepare 4,4'-dibromobiphenyl bis-Grignard reagent. Add 4.09g 2,7-dibromo-9-hexylcarbazole, 81.03mg NiCl2(dppp), 60mL tetrahydrofuran to a dry three-necked flask, evacuate and replace argon three times. Slowly drop the 4,4'-dibromobiphenyl bis-Grignard reagent into the three-necked flask, stir rapidly, and react at room temperature for 14h. Add 40mL 36% ethanol solution to the three-necked flask and stir at room temperature for 1h. Evaporate to dryness by rotary evaporation. Wash with water and butanol, extract with butanol for 24h, and dry. Add a small amount of chloroform to dissolve and precipitate in methanol. Filter and dry. A conjugated polymer is obtained.

[0060] The conjugated polymer prepared in this example has a number average molecular weight of 10320 g / mol and a weight average molecular weight of 20850 g / mol.

[0061] Example 4

[0062] Add 2.96g 1,4-dibromo-2,5-dimethoxybenzene, 1 iodine, 20mL tetrahydrofuran to a dry Schlenk bottle, evacuate and replace argon three times, and ultrasonically heat at 50℃ for 45min to prepare 1,4-dibromo-2,5-dimethoxybenzene bis-Grignard reagent. Add 3.26g 2,5-dibromo-3-hexylthiophene, 81.03mg NiCl2(dppp), 60mL tetrahydrofuran to a dry three-necked flask, evacuate and replace argon three times. Slowly drop 1,4-dibromo-2,5-dimethoxybenzene bis-Grignard reagent into the three-necked flask, stir rapidly, and react at 50℃ for 24h. Add 40mL 36% acetic acid solution to the three-necked flask and stir at room temperature for 1h. Evaporate to dryness by rotary evaporation. Wash with water and methanol, extract with methanol for 24h, and dry. Add a small amount of chloroform to dissolve and precipitate in methanol. Filter and dry. A conjugated polymer was obtained.

[0063] The conjugated polymer prepared in this example has a number average molecular weight of 12310 g / mol and a weight average molecular weight of 20850 g / mol.

[0064] Example 5

[0065] Add 2.86g 1,4-dibromonaphthalene, 1 grain of iodine, 30mL tetrahydrofuran to a dry Schlenk bottle, evacuate and replace argon three times, and ultrasonically heat at 45℃ for 45min to prepare 1,4-dibromonaphthalene bis-Grignard reagent. Add 3.40g 4,4'-dibromobenzophenone, 4.05g FeCl3, 3.5mL TEMED, 60mL tetrahydrofuran to a dry three-necked flask, evacuate and replace argon three times. Slowly drop 1,4-dibromonaphthalene bis-Grignard reagent into the three-necked flask, stir rapidly, and react at 25℃ for 20h. Add 40mL 36% acetic acid solution to the three-necked flask and stir at room temperature for 1h. Evaporate to dryness by rotary evaporation. Wash with water and methanol, and filter. Add N,N-dimethylformamide to dissolve and precipitate in petroleum ether. Filter and dry. A conjugated polymer is obtained.

[0066] The conjugated polymer prepared in this example has a number average molecular weight of 6510 g / mol and a weight average molecular weight of 9140 g / mol.

[0067] Example 6

[0068] Add 3.52g 9,9-dimethyl-2,7-dibromofluorene, 1 iodine, 30mL tetrahydrofuran to a dry Schlenk bottle, evacuate and replace argon three times, and ultrasonically heat at 50℃ for 40min to prepare 9,9-dimethyl-2,7-dibromofluorene double Grignard reagent. Add 3.26g 2,5-dibromo-3-hexylthiophene, 81.03mg NiCl2(dppp), 60mL tetrahydrofuran to a dry three-necked flask, evacuate and replace argon three times. Slowly drop 9,9-dimethyl-2,7-dibromofluorene double Grignard reagent into the three-necked flask, stir rapidly, and react at 50℃ for 24h. Add 40mL 50% tetrahydrofuran aqueous solution to the three-necked flask and stir at room temperature for 1h. Evaporate to dryness by rotary evaporation. Wash with water and methanol, extract with methanol for 24h, and dry. Add a small amount of chloroform to dissolve and precipitate in methanol. Filter and dry to obtain a conjugated polymer.

[0069] The conjugated polymer prepared in this example has a number average molecular weight of 18270 g / mol and a weight average molecular weight of 35550 g / mol.

[0070] Example 7

[0071] Add 2.36g of p-dibromobenzene, 1 grain of iodine, and 30mL of tetrahydrofuran to a dry Schlenk bottle, evacuate and replace argon three times, and ultrasonically heat at 45℃ for 45min to prepare p-dibromobenzene bis-Grignard reagent. Add 2.10g of 4,4'-tribromobenzene, 4.05g of FeCl3, 3.5mL of TEMED, and 60mL of tetrahydrofuran to a dry three-necked flask, evacuate and replace argon three times. Slowly drop p-dibromobenzene bis-Grignard reagent into the three-necked flask, stir rapidly, and react at 25℃ for 20h. Add 40mL of 36% acetic acid solution to the three-necked flask and stir at room temperature for 1h. Evaporate to dryness by rotary evaporation. Wash with water and methanol, and filter. Add N,N-dimethylformamide to dissolve and precipitate in petroleum ether. Filter and dry. A hyperbranched conjugated polymer is obtained.

[0072] The hyperbranched conjugated polymer prepared in this example has a number average molecular weight of 5200 g / mol and a weight average molecular weight of 10200 g / mol. The prepared hyperbranched conjugated polymer can be dissolved in tetrahydrofuran without crosslinking. Its GPC is a single peak, and the infrared absorption curve shows a skeleton vibration absorption peak of the benzene ring at 1580 cm-1 and a peak at 852 cm-1. -1 、698cm -1 The out-of-plane bending vibration absorption peaks of 1,3,5 ternary substituted CH of benzene ring are shown, indicating that a hyperbranched conjugated polymer is prepared.

[0073] In Examples 1-7, phenyl dihalide, biphenyl dihalide, fluorenyl dihalide, phenyl dihalide, biphenyl dihalide, fluorenyl dihalide, thienyl dihalide, carbazolyl dihalide can be replaced with each other.

[0074] Poly[5-(9,9-dimethyl-2,7-fluorenylene)-3-hexylthiophene], poly{carbonyl-1,4-[bis(1,4-phenylene)]naphthylene}, poly[2-(2,5-dimethyl-1,4-phenylene)-9-hexylcarbazole], and poly[5-(2,5-dimethoxy-1,4-phenylene)-3-hexylthiophene] prepared according to the method described in Examples 1-7 were subjected to infrared, 1 H-NMR, TGA, GPC characterization, such as Figure 1-4 As shown. Figure 1 The structure of the prepared poly[5-(9,9-dimethyl-2,7-fluorenylidene)-3-hexylthiophene] can be confirmed by infrared spectrum; Figure 2 The NMR spectrum of the prepared poly{carbonyl-1,4-[bis(1,4-phenylene)]naphthylene} can confirm the structure; according to Figure 3 The thermal decomposition temperature shows that the prepared poly[2-(2,5-dimethyl-1,4-phenylene)-9-hexylcarbazole] has good heat resistance; Figure 4 The molecular weight of poly[5-(2,5-dimethoxy-1,4-phenylene)-3-hexylthiophene] is unimodal, indicating that there is only one reaction mechanism for preparing poly[5-(2,5-dimethoxy-1,4-phenylene)-3-hexylthiophene] by this method, which is conducive to controlling the reaction.

[0075] The above disclosure is only the preferred embodiment of the present invention, which cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for preparing a conjugated polymer, characterized in that: The steps include: A. Obtain an aryl Grignard reagent; B. dissolving the aromatic substituent in a reaction solvent, and under the protection of an inert gas, dropwise adding the di-Grignard reagent to carry out a coupling polymerization reaction to obtain a crude product; C. purifying the crude product to obtain a conjugated polymer; The conjugated polymer includes one or more of a long-chain conjugated polymer and a hyperbranched conjugated polymer.

2. The method for preparing a conjugated polymer according to claim 1, characterized in that: When the conjugated polymer includes a linear conjugated polymer, in step B, the coupling polymerization reaction includes the following general reaction formula: The phenyl group in the formula also includes the exchange of biphenyl group, naphthyl group or fluorenyl group; X=F, Cl, Br, I; Y=F, Cl, Br, I; Ar includes phenyl, biphenyl, naphthyl, pyridyl, thiophene, and one or more of alkyl, aryl or alicyclic, halogen, sulfonic acid, and nitro groups; R' includes one or more of hydrogen, alkyl, aryl or alicyclic group, halogen, sulfonic acid group, and nitro group; R" includes one or more of hydrogen, alkyl, aryl or alicyclic group, halogen, sulfonic acid group, and nitro group.

3. The method for preparing a conjugated polymer according to claim 1, characterized in that: When the conjugated polymer includes a hyperbranched conjugated polymer, in step B, the aryl Grignard reagent includes one or more of an aryl bis-Grignard reagent and an aryl tris-Grignard reagent; When the aryl Grignard reagent comprises an aryl bis-Grignard reagent, the aromatic substituent comprises an aryl ternary halide; When the aryl Grignard reagent comprises an aryl tris Grignard reagent, the aromatic substituent comprises an aryl dihalide.

4. The method for synthesizing a conjugated polymer according to claim 3, characterized in that: In step B, the aromatic group contained in the aromatic bis-Grignard reagent includes phenyl, biphenyl, naphthyl, fluorenyl, and the aromatic ring thereof contains one or more substitutions of alkyl, aromatic, alicyclic, halogen, sulfonic acid, and nitro; the halogen contained in the aromatic bis-Grignard reagent includes one or more substitutions of fluorine, chlorine, bromine, and iodine; The aromatic groups contained in the aromatic ternary halide include phenyl, biphenyl, naphthyl, pyridyl, thiophene, and the aromatic rings thereof are substituted with one or more of alkyl, aromatic, alicyclic, halogen, sulfonic acid, and nitro groups; the halogen contained in the aromatic ternary halide includes one or more of fluorine, chlorine, bromine, and iodine; The aromatic groups contained in the three aryl Grignard reagents include phenyl, biphenyl, naphthyl, fluorenyl, and the aromatic rings thereof contain one or more substitutions of alkyl, aromatic, alicyclic, halogen, sulfonic acid, and nitro groups; the halogen contained in the three aryl Grignard reagents include one or more substitutions of fluorine, chlorine, bromine, and iodine; The aromatic dihalide contains aromatic groups including phenyl, biphenyl, naphthyl, pyridyl, thiophene, and its aromatic ring contains one or more substitutions of alkyl, aromatic, alicyclic, halogen, sulfonic acid, and nitro; the halogen includes one or more substitutions of fluorine, chlorine, bromine, and iodine.

5. The method for preparing a conjugated polymer according to claim 1, characterized in that: The operation of step A comprises: mixing iodine particles, halogenated aromatic hydrocarbons and magnesium powder in a reaction solvent, and heating and performing ultrasonic reaction under the protection of an inert gas to obtain the aromatic Grignard reagent.

6. The method for preparing a conjugated polymer according to claim 5, characterized in that: In step A, the molar ratio of the halogenated aromatic hydrocarbon to the magnesium powder is 1:3; the reaction temperature of the ultrasonic reaction is 10° C. to 60° C., the reaction time is 20 to 60 min, and the ultrasonic power is 300 to 1500 W.

7. The method for preparing a conjugated polymer according to claim 1 or 5, characterized in that: The inert gas includes one or more of nitrogen and argon; the reaction solvent includes tetrahydrofuran; in step B, the dropping process of the aromatic Grignard reagent includes slow dropping and rapid stirring, and the dropping time includes 0.1 to 1 hour; the reaction temperature of the coupling polymerization reaction includes 0 to 60° C., and the reaction time includes 4 to 24 hours.

8. The method for preparing a conjugated polymer according to claim 2, characterized in that: The purification treatment in step C includes: adding a quenching agent to the crude product for quenching, then removing the solvent, washing alternately with water and an alcohol solvent, precipitating in an alcohol solvent, and drying to obtain the conjugated polymer; the quenching agent includes one or more of formic acid, acetic acid, butyric acid, methanol, ethanol, butanol, and water; the alcohol solvent includes one or more of methanol, ethanol, and butanol; and the means for removing the solvent includes distilling.

9. A conjugated polymer product obtained by the method for preparing a conjugated polymer as claimed in claim 1.

10. A use of the conjugated polymer product as claimed in claim 9, characterized in that: Used for one or more of luminescence, light capture, conduction, solar cells, preparation of disease diagnosis equipment or preparations, preparation of biological detection equipment or preparations.

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