358 results about "Fluorene" patented technology

This invention discloses a fluorene-based organic small molecule hole transport material and its applications. The general structural formula of the fluorene-based organic small molecule hole transport material is as follows: where n = 1-4, and R represents the hole transport capacity. This fluorene-based organic small molecule hole transport material is used as an undoped hole transport material in perovskite solar cell devices. By introducing dicarboxylic acid groups onto the fluorene-based organic small molecule hole transport material, when used in an inverted perovskite solar cell device, it can form chemical bonds with the hydroxyl groups of the glass conductive substrate, forming a directionally aligned self-assembled layer on the surface of the glass conductive substrate. This effectively improves the charge transport capability at the interface and increases the photoelectric conversion efficiency of the perovskite solar cell device. Furthermore, since this perovskite solar cell device does not contain lithium salts, it exhibits high water and oxygen stability. In addition, the synthesis process of this fluorene-based organic small molecule hole transport material is simple, and the raw materials are inexpensive and readily available, making it highly valuable for practical applications.

The invention relates to the field of low dielectric materials, and particularly discloses a BCB-containing fluorene derivative as well as a preparation method and application thereof, and the derivative is specifically shown as follows: in substitution sites 1-10 of fluorene and / or fluorene derivative, substituent groups R1, R2, R3, R4, R5, R6, R7, R8, R9 and R10 are independently selected from at least one of hydrogen atoms, alkyl groups and aryl groups, and the substituent groups R9 and R10 comprise at least one BCB group. According to the present invention, the BCB group is introduced to the R9 and / or R10 substituent group of the fluorene and / or the fluorene derivative, such that the obtained BCB-containing fluorene derivative has characteristics of good thermal stability and low dielectric property. Meanwhile, the performance of the fluorene derivative containing BCB can be accurately optimized by flexibly regulating and controlling the types of substituent groups, the number of BCB groups on R9 and R10 substituent groups and the structure of the substituent group on the fluorenyl group, so that the problem of meeting low dielectric materials in the fields of high-performance PCBs, electronic packaging and the like in the prior art is solved.

The invention provides a fluorenyl alcohol derivative which can be used as an antibiotic adjuvant with a broad-spectrum synergistic effect. According to the compound, bacteria outer membrane asymmetric protein MlaC and phospholipase A1 PldA are taken as targets, and a series of fluorenyl alcohol derivatives targeting the bacteria outer membrane asymmetric protein MlaC and phospholipase A1 PldA are obtained through screening. The preferable compound WTU-15 can improve the antibacterial activity of antibiotics such as polymyxin, cefepime, tetracycline and the like on negative bacteria such as sensitive and drug-resistant escherichia coli, salmonella, klebsiella pneumoniae, acinetobacter baumannii and the like, and can also improve the in-vivo treatment effect of cefepime on mice infected by the drug-resistant acinetobacter baumannii. And the visceral organs of the mice survived after administration have fewer bacteria, and the mice are better after being healed. Normal physiological and visceral organ functions of the mouse are not affected by single and continuous administration of the WTU-15.

The invention discloses a low-loss resin composition containing active ester, a prepreg and a copper-clad laminate, the resin composition comprises the following main components by weight: 30-70 parts of epoxy resin, 30-70 parts of an epoxy curing agent, 0-3 parts of a curing accelerator, and 20-100 parts of a filler; wherein the epoxy curing agent is tetraphenol fluorenyl active ester; the prepreg is prepared by dipping glass cloth in a glue solution formed by the low-loss resin composition and baking the glass cloth in an oven at 80-200 DEG C for 1-20 minutes after dipping is completed, the copper-clad plate is prepared from the prepreg, fluorine-containing tetrafunctional active ester is synthesized through esterification reaction of tetraphenol fluorene and pentafluorobenzoyl chloride, and the fluorine-containing tetrafunctional active ester is used for preparing the copper-clad plate. A rigid fluorene ring structure is introduced, so that the thermal performance of the cured epoxy composite material is favorably improved; therefore, the invention effectively solves the problems that the existing resin composition for preparing the copper-clad plate is insufficient in heat resistance, and in order to meet the requirement of low polarity, the dosage of the filler is increased, the interfacial compatibility of the resin and the filler becomes poor, and the dielectric loss is further improved.

The invention provides a compound with an electron transmission function, an organic electroluminescent device containing the compound and application of the compound, the structure of the compound takes 9-alkyl-9-phenyl fluorenyl, phenanthryl and a triazine group as main components, the 9-alkyl-9-phenyl fluorenyl is one of core structures, fluorene is a polycyclic aromatic hydrocarbon with better planarity, and the triazine group is one of the core structures. Alkyl and phenyl are introduced to the ninth site to generate strong spatial repulsive force with a fluorene ring, a three-dimensional and non-planar propeller-shaped structure is formed, and the non-planar structure can effectively inhibit close packing of molecules in a solid state, so that concentration quenching and excimer formation caused by pi-pi packing are prevented, and the stability of the fluorescent probe is improved. And moreover, the rigid and non-planar structure can also effectively improve the thermal stability of the material, and the service life of the device is prolonged. The compound provided by the invention is used as an electron transport layer and a hole blocking layer in a light-emitting device, so that the device has low driving voltage, high luminous efficiency and long service life.

The invention relates to the technical field of preparation of organic photoelectric materials, in particular to a boron-nitrogen compound and an organic electroluminescent device comprising the same. The boron-nitrogen compound disclosed by the invention has good electron and hole receiving capability, and interaction among luminescent molecules can be effectively inhibited by introducing large-steric-hindrance azafluorene / benzfluorene / azabenzfluorene / silafluorene / germanium heterofluorene and other groups. The energy transmission performance between a subject and an object or a sensitizer can be improved by a large conjugated spiro structure unit, an sp2 aza-aromatic ring and other structures. Specifically, the boron-nitrogen compound provided by the invention is used as a functional layer, especially as an organic electroluminescent device manufactured by a luminescent layer, the current efficiency is improved, the lighting voltage is reduced, and meanwhile, the service life of the device is greatly prolonged. Therefore, after most electrons and holes are compounded, energy is effectively transferred to the boron-nitrogen compound, so that high luminous efficiency is realized.

The invention relates to the technical field of high-molecular polymers and surface chemical modification thereof, in particular to a low-dielectric-constant polyaryletherketone material and a preparation method thereof, and a flexible copper foil laminated structure and a preparation method thereof. The low-dielectric-constant polyaryletherketone material is obtained by taking a bisphenol monomer and difluorobenzophenone as reaction monomers and carrying out aromatic nucleophilic polycondensation reaction; wherein the bisphenol monomer is selected from a combination of C3-C8 normal or isomeric alkyl substituted hydroquinone and bisphenol containing at least one aryl group; the bisphenol containing at least one aryl group is selected from one or more of bisphenol AP, bisphenol BP, bisphenol Z and bisphenol fluorene; the low-dielectric-constant polyaryletherketone material forms a thin film, the surfactant treatment layer and the grafting layer are sequentially formed on the thin film, then the thin film is compounded with the copper foil, and the formed flexible copper foil laminated structure has high peel strength and low dielectric constant.

A resin composition includes 100 parts by weight of a thermosetting resin, 10 parts by weight to 40 parts by weight of a fluorene-containing compound and 210 parts by weight to 400 parts by weight of silica. The resin composition may be used to make various articles, including a resin film, a prepreg, a laminate or a printed circuit board, and at least one or more of the following properties can be improved, including PCT water absorption ratio, dielectric constant, dissipation factor, copper foil peeling strength, thermal conductivity and glass transition temperature.

The invention belongs to the technical field of biosensing of organic electrochemical transistors, and particularly relates to an organic electrochemical transistor based on a spirobifluorene polymer as well as a preparation method and application of the organic electrochemical transistor. An active layer of the organic electrochemical transistor is composed of poly [benzo [2, 1, 3] thiadiazole-4, 7-diyl-[5-[3, 6-bis (octyloxy)-9, 9 '-spirobis [9H-fluorene]-2-yl]-1, 3-phenylene]], an ionic gel layer is prepared by mixing PVDF-HFP, EMIM TFSI and Li TFSI, and a gate electrode is modified with MnO2 nanoparticles and poly [benzo [2, 1, 3] thiadiazole-4, 7-diyl-[5-[3, 6-bis (octyloxy)-9, 9'-spirobis [9H-fluorene]-2-yl]-1, 3-phenylene]-1, 3] thiadiazole-4, 7-diyl-[5 and 2, 3-phenylene]]. The organic electrochemical transistor can be used for detection of hydrogen peroxide, is high in detection sensitivity, good in selectivity and wide in application range, and provides a new solution for detection of hydrogen peroxide.

The application belongs to the technical field of automobile intelligent display and polymer optical material, and relates to a front windshield anti-reflection film for automobile AR-HUD and a preparation method thereof. The anti-reflection film comprises modified optical acrylic resin, 9,9-bis(4-hydroxyphenyl) fluorene, nano-silica sol, ultraviolet absorber, light stabilizer and leveling agent. The modified optical acrylic resin is modified by introducing o-diphenol structural unit, aryl boronic acid structural unit, beta-cyclodextrin structural unit and adamantane structural unit into the acrylate base structure to form a dynamic borate ester bond and a host-guest inclusion synergistic topological network structure through free radical copolymerization. The anti-reflection film significantly improves the reflection efficiency of the target wave band of AR-HUD while maintaining high visible light transmittance, and exhibits excellent optical stability and double image control ability in a humid heat environment, and is suitable for the field of optical functional film of automobile front windshield.

The application provides a preparation method of a diphenylfluorene polyether. The method uses diphenylfluorene as a substrate, butylene oxide as an epoxide monomer, toluene as an organic solvent, and under the action of a composite catalyst, reacts at 110-200 DEG C for 2-6 hours to obtain the diphenylfluorene polyether. The composite catalyst is obtained by reacting a porous aromatic skeleton with a bromoalkyl quaternary ammonium salt to obtain a quaternary ammonium salt functionalized porous aromatic skeleton, and finally, a basic catalyst is limitedly encapsulated in the pore channel of the quaternary ammonium salt functionalized porous aromatic skeleton by electrostatic attraction. The catalyst of the method can be recycled and reused, and the yield retention rate is greater than or equal to 92% after the composite catalyst is used for 5 cycles, and the method is suitable for optical display, high-frequency circuit board, semiconductor packaging and other fields.

This invention discloses a method for preparing sulfonamide-modified benzo[a]fluorene-5-one derivatives, using 1,7-enyne and N Using sulfonylaminopyridine salts as raw materials, a series of sulfonated benzo[a]fluorene-5-one compounds were successfully synthesized by catalyzing the sulfonation / cyclization tandem reaction of 1,7-enynes under photocatalytic conditions. This method has excellent functional group tolerance and high economic applicability.

A heterocyclic compound containing heteroatom substituted fluorene and an optoelectronic device are provided. The heterocyclic compound includes a structure in Formula I:where Y is selected from O or S; at least one of X1, X2, X3, X4, X5, X6, X7 and X8 is a N atom, and rest are CR2; L1, L2, and L3 are independently selected from single bond, substituted or unsubstituted aromatic groups; Ar1 and Ar2 are independently selected from substituted or unsubstituted aromatic groups or heteroaryl groups; R1 is selected from a hydrogen atom, a deuterium atom, or an aromatic group or a heteroaryl group condensed with adjacent groups; and R2 is selected from a hydrogen atom, a deuterium atom, a substituted or unsubstituted C1-C5 alkyl group, a halogen, a cyano group, or an amino group.

The invention provides thermochromic microcapsules, thermochromic silica gel, a preparation method of the thermochromic silica gel and a physiotherapy pad. The thermochromic microcapsule comprises a core material and a wall material coating the outer surface of the core material, and the core material comprises stearic acid, crystal violet lactone and bisphenol fluorene. The wall material is formed by in-situ polymerization of an amino resin prepolymer on the surface of the core material. The bisphenol fluorene has a fluorene ring, and the fluorene ring is of a large-size and flat structure, so that the rigidity of bisphenol fluorene molecules is high. When the amido resin prepolymer is subjected to in-situ polymerization on the surface of the core material to form the wall material, part of bisphenol fluorene molecules can be embedded into a cross-linked network of the amido resin, and the rigid bisphenol fluorene molecules can well limit movement and rotation of amido resin polymer molecular chains; besides, in the polymerization process, bisphenol fluorene molecules can serve as cross-linking points to react with the amino resin prepolymer, different polymer chains are effectively connected, the cross-linking density of the wall material is improved, and the bisphenol fluorene molecules can effectively improve the mechanical strength and hardness of the wall material.

The invention discloses a high-temperature-resistant liquid crystal polymer substrate for ultrathin flexible display, which belongs to the technical field of flexible display and comprises a modified liquid crystal polymer and a functional additive dispersed in the modified liquid crystal polymer. The modified liquid crystal polymer is prepared by polymerizing a monomer composition, and is specifically prepared from 38 to 42 parts of p-hydroxybenzoic acid, 28 to 30 parts of 4, 4 '-biphenol, 5.6 to 6.0 parts of terephthalic acid, 4.4 to 5.0 parts of 2, 6-naphthalic acid, 2.7 to 3.3 parts of isophthalic acid, 9 to 11 parts of 2, 2-bis (3, 5-difluoro-4-hydroxyphenyl) hexafluoropropane, 4.5 to 5.5 parts of N, N'-dihydroxypyromellitic diamine, 9 to 11 parts of 9, 9-bis [4-(4-methoxycarbonyl phenoxy) phenyl] fluorene and 1, 2-bis (4-(4-methoxycarbonyl phenoxy) phenyl] fluorene. The component A is prepared from 5.5 to 6.5 parts of 1, 4-cyclohexanedimethanol; the functional additive comprises an azobenzene derivative, a hot acid generator and a hydrogen bond enhancer; through the synergistic effect of a specific monomer combination, a functional additive and an optimization process, the technical bottleneck that heat resistance, transparency, dimensional stability and flexibility of an existing material are difficult to consider at the same time is broken through.

The invention discloses a preparation method and application of a silicon-based functionalized fluorenyl polysubstituted acetylene copolymer and a gas separation membrane thereof. Belongs to the technical field of polymer material and gas separation. The invention provides a new thought for preparation of a high-permeability gas separation membrane material. The preparation method comprises the following steps: carrying out copolymerization on 1-phenyl-2-(7-trimethylsilyl-9, 9-bis (trimethylsilyl-fluorene-2-yl) acetylene and 1-phenyl-2-(7-trimethylsilyl-9, 9-dimethyl-fluorene-2-yl) acetylene under the catalysis of TaCl5-n-Bu4Sn, so as to prepare a copolymer with high molecular weight; the preparation method comprises the following steps of: carrying out film casting on a solution of the nano-silver oxide, and then carrying out desiliconization treatment by using normal hexane / trifluoroacetic acid to obtain a gas separation membrane with the thickness of 100-220 microns, the specific surface area of 298-492 m / g and the total pore volume of 0.134-0.299 cm / g. The prepared separation membrane has the advantages that the COpermeability is up to 36,900 Barrer, the Opermeability is 19,800 Barrer, the thermal decomposition temperature exceeds 420 DEG C, the separation membrane can be used for separating gases such as COO, ON and the like, the preparation process is simple and convenient, and the industrial potential is realized.

To provide a photosensitive resin composition capable of forming a cured product which hardly becomes cloudy even in a high-temperature and high-humidity environment and can maintain high transmittance, a cured product obtained by curing the photosensitive resin composition, a cured film or a microlens composed of the cured product, and an image display device including the cured product or the microlens.SOLUTION: The photosensitive resin composition contains (A) an alkali-soluble resin, (B) a photopolymerizable compound and (C) a photopolymerization initiator, wherein the alkali-soluble resin (A) is a reaction product of a bisarene fluorene compound (A1), an ethylenically unsaturated group-containing monomer (A2) and an acid anhydride (A3), and the acid anhydride (A3) contains two or more compounds selected from compounds represented by the following general formulae (A3-1) to (A3-3).SELECTED DRAWING: None

The invention relates to the technical field of pavement construction, and particularly discloses a modified concrete high-skid-resistance wear-resistant pavement and a preparation method thereof. The modified concrete high-skid-resistance wear-resistant pavement is formed by pouring modified concrete; the modified concrete comprises the following components in parts by mass: 100 parts of water; 230 to 240 parts of cement; 28 to 30 parts of fly ash; 470 to 480 parts of fine aggregate; 620 to 630 parts of coarse aggregate; 24 to 26 parts of modified whisker; 4-6 parts of an additive; the modified whiskers are obtained by modifying calcium carbonate whiskers with a modifying solution; the modified liquid is a compound of a solvent, bisphenol fluorene, 2, 2 '-diphenyldicarboxylic acid, glycidyl and beta-propiolactone. The wear-resistant pavement material has the advantages that the wear resistance of the pavement is further improved while the pavement has skid resistance.

The invention belongs to the field of thin film capacitors and related dielectric materials, and particularly discloses an all-organic composite material as well as a preparation method and application thereof, and the all-organic composite material comprises the following components in percentage by mass: 98.00 wt%-99.75 wt% of fluorene polyester and 0.25 wt%-2.00 wt% of hexacyanohexaazabenzophenanthrene. The preparation method comprises the following steps: respectively adding fluorene polyester and hexacyanohexaazabenzophenanthrene into an organic solvent, fully stirring and dissolving, and ultrasonically mixing to obtain a uniformly mixed solution; uniformly coating a substrate with the mixed solution, heating, carrying out vacuum annealing, and stripping to obtain the fluorene polyester / hexacyanohexaazabenzophenanthrene composite film. According to the invention, the charge-discharge efficiency and discharge energy density of the polymer under high temperature and high electric field are improved, the technical problems of high leakage loss and low charge-discharge efficiency of the existing polymer film are solved, and large-scale industrial production is easy to realize.

This invention belongs to the field of polymer materials technology, specifically relating to a method for producing environmentally friendly polycarbonate. The method includes: S1 adding diphenyl carbonate, isosorbide, and bisphenol fluorene to a reaction vessel under a nitrogen atmosphere, followed by mixing to obtain a mixture; S2 adding a titanium-silicon molecular sieve composite catalyst to the mixture and performing a transesterification reaction, followed by a polycondensation reaction; after the reaction, the product is poured off while hot and cooled to obtain an intermediate product; S3 mixing and stirring the intermediate product, pyridine-type ionic liquid-modified hydrotalcite, rubber elastomer, compatibilizer, and antioxidant to obtain a premix; S4 melt-extruding the premix in a twin-screw extruder, followed by stretching, water cooling, air drying, pelletizing, and final drying to obtain environmentally friendly polycarbonate. The polycarbonate produced by this method not only has low color but also excellent impact resistance, heat resistance, and flame retardancy.

The invention records a fluorenyl polyimide film with a low dielectric constant and a preparation method and application thereof, and the polyimide is prepared by taking 9, 9-bis (4-(4-aminophenoxy) phenyl) fluorene and 4, 4 '-diaminodiphenyl ether diamine as diamine and aromatic dianhydride as dianhydride, and carrying out thermal imidization on the diamine and the dianhydride to obtain the PI film. The PI film provided by the invention has an asymmetric molecular structure, a fluorine-containing group and a fluorene group. The fluorine group has smaller dipole and lower polarizability, and can increase the free volume, and the free volume of the polymer material is increased, so that the number of polar groups in unit volume can be reduced, and the dielectric constant of the PI film can be reduced. The method can be applied to the high-tech fields of low-dielectric materials, gas separation membranes, fuel cell proton exchange membranes, outer space and the like.

The invention relates to the technical field of high-frequency and high-speed substrate resin and packaging materials of microelectronic devices, and particularly discloses hydrocarbon resin of dibenzocyclobutene fluorene and derivatives thereof and a preparation method of the hydrocarbon resin, and the hydrocarbon resin is prepared by mixing 9, 9-disubstituent-9H-fluorene and / or the dibenzocyclobutene fluorene derivatives according to a specific proportion, adding a solvent, and stirring to obtain the hydrocarbon resin of the dibenzocyclobutene fluorene and the derivatives of the dibenzocyclobutene fluorene and the derivatives of the dibenzocyclobutene fluorene. And carrying out a thermocuring reaction to obtain the product. The dibenzocyclobutene fluorene derivative is prepared by carrying out Heck reaction on 9, 9-disubstituent-9H-fluorene and halogenated benzocyclobutene under the catalysis of a base catalyst and a modified palladium catalyst, the prepared hydrocarbon resin has very low dielectric constant and dielectric loss and higher softening point and peel strength, and can better meet market requirements.

The invention provides a polyester resin, a resin composition, a curable resin composition, a cured product, a prepreg, a circuit board, a build-up film, a semiconductor sealing material, and a semiconductor device. The present invention addresses the problem of providing a polyester resin, a resin composition, a curable resin composition, and a cured product thereof that can exhibit low dielectric loss tangent and low thermal expansion. A polyester resin as a solution comprising (A) an aromatic polycarboxylic acid or a halide thereof, (B) a monohydroxy aromatic compound, and (C) a polyhydroxy aromatic compound containing fluorene in the structure thereof.

According to the fluorene-containing organic compound, the preparation method thereof and the resin, the fluorene-containing organic compound has the advantages of being good in dissolution, easy to process, excellent in film forming performance and the like, and the refractive index and the thermal stability of the resin can be improved. According to the preparation method of the fluorene-containing organic compound, mixed acid containing acetic acid is adopted as a solvent of a nucleophilic addition reaction system and also serves as an acid catalyst, the conversion rate of the multi-aromatic-ring phenol intermediate can be increased, then the multi-aromatic-ring phenol intermediate and ethylene carbonate or 2, 3-dihalopropanol are subjected to an etherification substitution reaction, and the fluorene-containing organic compound is obtained. The fluorene-containing organic compound synthesized by the method can be used for preparing polycarbonate resin with high refractive index, and the whole synthesis process has good universality, high reaction activity, high conversion rate and easiness in purification.

To provide a polycarbonate resin composition that excels in flame retardancy and moldability, and a molded article comprising the same.SOLUTION: A polycarbonate resin composition comprises: (A) a carbonate structural unit derived from a dihydric phenol compound, (B) a siloxane structural unit, and (C) 9,9-bis(4-hydroxy-3-alkylphenyl) fluorene or a structural unit derived therefrom, wherein, in 100 wt.% of the total structural units, the amount of Si element derived from the siloxane structural unit is in the range of 0.3 to 30.0 wt.%, and the content of (C) 9,9-bis(4-hydroxy-3-alkylphenyl) fluorene or the structural unit derived therefrom is in the range of 1.0 to 40 wt.%.SELECTED DRAWING: None

The application belongs to the technical field of high-frequency high-speed materials for electronic packaging, and particularly relates to a low-dielectric acenyl copolymer resin for M9 copper-clad plate and an ATRP preparation method thereof. A two-step method is used for full-process ATRP active controlled polymerization, and the two-step method comprises the following steps: S1, a single-end active bromine end group is prepared on a norbornene macromolecular initiator by ATRP polymerization with 3-bromocyclohexene as an ATRP initiator, and the length and structure of the norbornene segment are controlled; and S2, ATRP controlled copolymerization of acenylene monomers and divinylbenzene crosslinking monomers is carried out through the norbornene macromolecular initiator to obtain an acenyl copolymer resin.

The application belongs to the field of optical functional composite material application, and discloses a preparation method of conjugated oligomer / gold nanocluster light energy conversion material. The preparation method is to synthesize conjugated oligomer material with main chain of fluorene and thiophene and side chain containing active groups, and to compound the conjugated oligomer material with gold nanocluster containing mercapto ligand through covalent connection to prepare conjugated oligomer / gold nanocluster compound. The preparation method is simple and easy to operate, and can effectively compound two kinds of semiconductor materials. The nanocomposite has a size of about 2 nanometers and has the ability to quickly enter photosynthetic organisms and structures. The conjugated oligomer / gold nanocluster heterojunction is cultured with photosynthetic organisms and structures, and under sunlight irradiation, high-efficiency photo-generated electrons are generated and quickly transferred to the electron transport chain of the photosynthetic organisms and structures, so as to improve the solar energy conversion efficiency, increase the biomass yield, and have practical application value in the field of energy conversion.

The invention provides a polycyclic aromatic compound as well as an organic light-emitting device and an organic light-emitting device adopting the polycyclic aromatic compound. The polycyclic aromatic compound has a structure as shown in a general formula I. According to the polycyclic aromatic compound, fluorene or carbazole is introduced on the basis of a parent nucleus; the stacking density and steric hindrance of the compound are increased due to excessive phenyl groups in the compound, the evaporation temperature of the compound is influenced, and the luminous efficiency and the service life are reduced. Fluorene or carbazole has a relatively large conjugation characteristic, so that on one hand, the stacking effect between molecules can be improved, and on the other hand, the horizontal arrangement degree of the molecules can be increased, so that the molecules are effectively and horizontally arranged, the luminous efficiency is effectively increased, and the service life of a device is also greatly prolonged. The service life and the efficiency of a device prepared from the doping material are obviously improved.

The application provides a crystallization method of refined fluorene, which comprises the following steps: adding a raw material fluorene fraction into a mixed solution, carrying out a first beating and washing at normal temperature, and obtaining crude fluorene through centrifugal separation; mixing the crude fluorene with a solvent A, stirring and heating to 65-85 DEG C, cooling to 5-30 DEG C after the solid part is dissolved, keeping the temperature for 1 h, and obtaining industrial fluorene through centrifugal separation, and the mother liquor is used as a washing agent to participate in the first beating and washing. The method has simple and easy-to-control operation conditions and low cost. Through reducing the high-temperature operation time, using a high-boiling and low-volatility solvent to reduce the solvent loss in the crystallization process, using a single solvent to facilitate solvent recovery, using the mother liquor in the process to increase the yield and reduce the solvent consumption, using the beating and washing mode in the first step operation to operate at normal temperature, reducing the energy consumption and shortening the process cycle, and cooling and crystallizing in the second step operation, the crystal part is dissolved, the remaining solid is used as a crystal seed, so that the crystallization process is controllable, the primary burst nucleation is avoided, and the walling condition is reduced.

The present invention relates to the field of organic synthesis, discloses a kind of preparation method of 9,9-bis-benzyl-9-hydrogen-fluorene, with fluorene compounds and benzyl quaternary ammonium salt as reaction raw materials, under the effect of alkaline reagents such as sodium tert-butoxide and / or potassium tert-butoxide, 9,9-bis-benzyl substituted fluorenes can be efficiently synthesized. The raw materials used in the present invention are simple to prepare, stable in nature, and there is no need to add organometallic strong base in the reaction, the reaction conditions are safe and mild, experimental operation and post-processing steps are simple, and yield is high, versatility is strong, there is good application value in the field of organic synthesis and organic light-emitting polymer materials, and an effective new approach is provided for the synthesis of substituted fluorene compounds.