17 results about "Polyfluorene" patented technology

This invention relates to the field of lithium-ion battery technology, specifically to a silicon-carbon material, its preparation method, and its application. The silicon-carbon material includes a core and a coating layer covering at least a portion of the surface of the core. The core includes nano-silicon material. The coating layer includes a flexible conductive polymer layer and a carbon layer existing between the core and the flexible conductive polymer layer. The flexible conductive polymer layer includes a conductive polymer having a conjugated structure. The conductive polymer includes at least one of polyaniline, polypyrrole, polyacetylene, polythiophene, polyquinoline, polyfluorene, polybenzothiadiazole, and poly(p-phenylenevinylene). The mass ratio of the conductive polymer to the total mass of the carbon layer and the core is (0.05-0.2):1. This invention, by constructing a shell structure with a "carbon layer-flexible coating layer" on the core, enables the silicon-carbon material with this core-shell structure to solve the problems of volume expansion, poor conductivity, and SEI layer instability of silicon materials in lithium-ion batteries.

The invention discloses a manufacturing method of a high-power photovoltaic module, and aims to solve the technical problems that specular reflection on the lower surface of glass of an existing crystalline silicon photovoltaic module causes light loss, the utilization rate of ultraviolet light is low, and aging of a packaging adhesive film is easily accelerated. The method comprises the following steps: firstly, carrying out hydrofluoric acid etching or micron-order fusion embossing treatment on the lower surface of photovoltaic front glass to form a concave-convex light trapping structure so as to reduce mirror reflection of incident light; the upper surface of the glass is coated with a polyfluorene down-conversion material layer with the thickness of 50-100 nm, and ultraviolet light is converted into high-responsivity blue light. Subsequent procedures of cell scribing, multi-main-grid series welding, POE adhesive film lamination, EL and appearance detection, vacuum lamination, trimming and framing and the like are carried out to complete assembly preparation. Tests show that in a 66-version assembly, only the lower surface of the glass is treated, so that the power can be improved by 2.1 W compared with that of a traditional process, the power is improved by 5.8 W after the lower conversion film layer is overlaid, meanwhile, the aging effect of ultraviolet light on the adhesive film is weakened, the service life of the assembly is prolonged, and the process is compatible with an existing production line and has remarkable industrial application value.

Medical electrode comprising a base body (101) on which an electrically conductive first layer (102) and a cover layer (103) are arranged, the cover layer comprising an overhang (107) which partially covers the first layer (102), and an electrically conductive second layer (105) which is arranged on the first layer (102), the second layer (105) comprising an electrically conductive polymer selected from the group consisting of a polyacetylene, a polyvinyl alcohol, a polyfluorene, a polyphenylene, a polyphenylene vinylene, a polypyrene, a polyazulene, a polynaphthalene, a polypyrrole, a polycarbazole, a polyindole, a polyazepine, a polyaniline, a polyacene, a polythiophene, a polythiophene vinylene, a poly-p-phenylene sulfide, a polypyridine or functionalized derivatives, precursors or mixtures thereof;wherein the top layer (103) further comprises a recess (108), wherein the second layer (105) is arranged exclusively within the recess (108), and wherein the outwardly facing surface of the second layer (105) is spaced apart from the outwardly facing surface of the top layer (103), leaving a free area within the recess (108).

The present invention provides UV excitable polyfluorene-based conjugates and their use in analyte detection methods.

A fluorene-based ionomer containing long alkyl side chains, its preparation method, and its application in anion exchange membranes. This invention belongs to the field of fluorene-based ionomers and their preparation. The purpose of this invention is to solve the technical problem that existing anion exchange membranes based on polymers constructed from ether-free polyfluorene backbones and quaternary ammonium salt cations cannot achieve an optimal balance between mechanical and ion conductivity. This invention introduces long alkyl side chains of a specific length onto a highly rigid fluorene-based polymer backbone, constructing a molecular structure that combines rigidity and flexibility, thereby significantly improving the overall performance of the anion exchange membrane. The resulting fluorene-based ionomer containing long alkyl side chains is applied as an anion exchange membrane component in the field of fuel cell alkaline batteries.

A novel polyfluorene-based ionomer, an anion exchange membrane, a method for preparing the polyfluorene-based ionomer, and a method for fabricating the anion exchange membrane are proposed. The polyfluorene-based ionomer contains no aryl ether bonds in the polymer backbone and includes piperidinium groups incorporated into the repeating units. The anion exchange membrane is fabricated from the polyfluorene-based ionomer. The anion exchange membrane has good thermal and chemical stability, excellent mechanical properties, and high ion conductivity. Due to these advantages, the anion exchange membrane can be applied as a membrane for an alkaline fuel cell and to a binder for an alkaline fuel cell or water electrolysis.

The application relates to a kind of polyfluorene green fluorescent high molecular materials, preparation method and application thereof, relate to fluorescent anti-counterfeiting material field, solve the problem of poor stability of organic fluorescent material, can be applied to fluorescent anti-counterfeiting material.The boron ester or boric acid or tin salt monomer of fluorene, bromine monomer of benzene and Ar bromine monomer are connected by single bond polymerization reaction;Or the boron ester or boric acid or tin salt monomer of fluorene, boron ester or boric acid or tin salt monomer of benzene and Ar bromine monomer are connected by single bond polymerization reaction;Or the bromine monomer of fluorene, boron ester or boric acid or tin salt monomer of benzene and Ar boron ester or boric acid or tin salt monomer are connected by single bond polymerization reaction;Or the bromine monomer of fluorene, bromine monomer of benzene and Ar boron ester or boric acid or tin salt monomer are connected by single bond polymerization reaction;Or the boron ester or boric acid or tin salt monomer of fluorene, Ar boron ester or boric acid or tin salt monomer and benzene bromine monomer are connected by single bond polymerization reaction;Or the bromine monomer of fluorene, Ar bromine monomer and benzene boron ester or boric acid or tin salt monomer are connected by single bond polymerization reaction.

The invention relates to a piperidine functionalized ring-containing polyfluorene ether ketone anion exchange membrane and a preparation method thereof. The preparation method comprises the following steps: reacting tetramethyl bisphenol fluorene with excessive 4, 4 '-difluorobenzophenone to generate an ABA type compound containing four methyl groups, performing cyclization reaction on the ABA type compound and tetramethyl dimethoxy bisphenol fluorene in a dilute solution to obtain a dimethoxy group-containing cyclic compound, reacting the dimethoxy group-containing cyclic compound with boron tribromide to prepare a cyclic monomer containing two phenolic hydroxyl groups, and reacting the cyclic monomer with 4, 4'-difluorobenzophenone to obtain a dimethoxy group-containing cyclic monomer. The preparation method comprises the following steps: carrying out polycondensation on 4, 4 '-difluorobenzophenone and bisphenol fluorene at a high temperature to prepare a ring-containing polyfluorene ether ketone compound, brominating methyl in the ring-containing polyfluorene ether ketone compound by utilizing bromination reaction, reacting with N-methylpiperidine to prepare a piperidine functionalized ring-containing polyfluorene ether ketone compound, and carrying out solution casting to obtain the anion exchange membrane. The obtained anion exchange membrane has the advantages of high ion conductivity, low vanadium ion permeability, high mechanical strength and the like.

The present invention relates to an electrolyte membrane, a fuel cell comprising the same, and a water electrolysis device and a method for manufacturing the same. More specifically, the present invention relates to an electrolyte membrane comprising a polyfluorene-based ionomer having a fluorene backbone consisting of only carbon-carbon bonds and side chains consisting of perfluorinated sulfonic acid groups. The electrolyte membrane comprising the polyfluorene-based ionomer has high proton conductivity, excellent chemical durability, excellent mechanical properties, and excellent volume stability.

The application discloses a kind of aromatic side chain type fluorine-free polyfluorene ether ketone proton exchange membrane and preparation method thereof.The application first carries out one-step polymerization with four methoxy bisphenol fluorene and 4,4'-difluorobenzophenone and bisphenol fluorene, to obtain fluorine-free polyfluorene ether ketone compound containing methoxy, then carries out demethylation reaction to obtain fluorine-free polyfluorene ether ketone compound containing phenolic hydroxyl, then reacts with sodium p-chlorobenzenesulfonate, to obtain aromatic side chain type fluorine-free polyfluorene ether ketone compound containing sodium sulfonate. Film is formed by solution casting method and then acidification, to obtain aromatic side chain type fluorine-free polyfluorene ether ketone proton exchange membrane. The obtained proton exchange membrane has the advantages of low cost, high proton conductivity and excellent solubility, thermal stability, oxidative stability, mechanical properties and the like.

The invention discloses a polyfluorene-polystyrene-polyfluorene triblock copolymer with high solid-state photoluminescence efficiency and a preparation method of the polyfluorene-polystyrene-polyfluorene triblock copolymer. The method comprises the following steps: firstly, preparing a hetero-bifunctional polystyrene precursor (alpha-(t-butyloxycarbonyl propionyl)-omega-bromine-polystyrene) with different functional groups at two ends through atom transfer radical polymerization; then, converting the precursor into an alpha, omega-dicarboxyl polystyrene macromolecular intermediate with carboxyl groups at two ends; and finally, through a Steglich esterification reaction, the dicarboxyl intermediate is coupled with a hydroxyl-terminated polyfluorene derivative, and the final A-B-A type triblock copolymer is obtained. By accurately controlling the molecular weight of the polystyrene chain segment, the length of the central flexible block can be effectively regulated and controlled, so that the inter-chain distance and aggregation form of a final product in a solid state are optimized. The copolymer can effectively inhibit luminescence quenching caused by aggregation due to a unique hard-soft-hard bridging structure, and can be used as a high-performance luminescent material.

The present invention relates to an anion exchange membrane comprising a cross-linked polymer in which polyfluorene is cross-linked with styrene-ethylene-butylene-styrene (SEBS). The anion exchange membrane according to the present invention has excellent mechanical properties and thermal stability while having high ionic conductivity, and can be applied to a water electrolysis device.

The invention relates to a sulfonated polyfluorene ether ketone proton exchange membrane containing an aromatic macrocyclic structure and a preparation method of the sulfonated polyfluorene ether ketone proton exchange membrane. The preparation method comprises the following steps: reacting bisphenol fluorene with excessive 4, 4 '-difluorobenzophenone to prepare a fluorine-terminated ABA type compound, reacting with dimethoxy bisphenol fluorene in a dilute solution to prepare a dimethoxy-containing cyclic compound, reacting with boron tribromide to prepare a phenolic hydroxyl group-containing cyclic monomer, and reacting with bisphenol fluorene and 3, 3'-sodium disulfonate-4, 4 '-difluorobenzophenone to prepare a phenolic hydroxyl group-containing cyclic monomer. The preparation method comprises the following steps: carrying out polycondensation on 4, 4 '-difluorobenzophenone and 4, 4'-difluorobenzophenone at a high temperature to obtain a polyarylether compound containing an aromatic macrocyclic structure, and finally carrying out solution casting to form a membrane so as to prepare the proton exchange membrane. The obtained membrane has the advantages of excellent proton conductivity, thermal stability, mechanical property and the like.

The present disclosure relates to a technology of synthesizing an aromatic polyfluorene-based copolymer having a crosslinked structure, not having an aryl ether bond in a polymer backbone, and introducing a piperidinium group in a repeating unit, and applying an anion exchange membrane prepared therefrom to an alkaline fuel cell, water electrolysis, carbon dioxide reduction, a metal air battery, and the like. According to the present disclosure, the anion exchange membrane having a crosslinked structure has excellent thermal stability, chemical stability, and mechanical properties, and high water retention capacity, ionic conductivity, and durability, and exhibits an excellent dispersed phase.

The present invention relates to a negative electrode for a lithium secondary battery, comprising: a negative electrode active material layer provided on at least one surface of a negative electrode current collector layer; a surface layer provided on the surface of the negative electrode active material layer; and an inner layer provided between the negative electrode active material layer and the surface layer, wherein the surface layer and the inner layer each include at least one selected from the group consisting of a polyvinyl-based polymer, a polyamide-based polymer, a polysilane-based polymer, a polyfluorene-based polymer, a polyaniline-based polymer, and combinations thereof, and the inner layer and the surface layer include polymers different from each other to suppress a thermal runaway phenomenon.

The invention discloses a preparation method of a cross-linked side chain sulfonated polyfluorene ether ketone proton exchange membrane, which comprises the following steps: firstly preparing tetramethyl dimethoxy bisphenol fluorene, then polymerizing with 4, 4 '-difluorobenzophenone to obtain polyfluorene ether ketone containing methoxy, then converting the methoxy into phenolic hydroxyl to obtain polyfluorene ether ketone containing phenolic hydroxyl, and then reacting with 1, 4-difluorobenzophenone to obtain the cross-linked side chain sulfonated polyfluorene ether ketone proton exchange membrane. The preparation method comprises the following steps: reacting 1, 3-propane sultone with 4, 4 '-difluorobenzophenone, introducing a sulfonic acid group and crosslinking, casting to form a membrane, and acidifying with a sulfuric acid solution to prepare the crosslinked side chain sulfonated polyfluorene ether ketone proton exchange membrane. According to the preparation method, a phenolic hydroxyl group is selected as a common active site for grafting a sulfonic acid group and crosslinking, so that the problem of poor reaction compatibility among different active sites can be avoided, grafting of the sulfonic acid group and crosslinking of the polymer are combined into one step, and the process is simple. The obtained cross-linked side chain sulfonated proton exchange membrane has high proton conductivity, low vanadium ion permeability and excellent mechanical stability, thermal stability and antioxidant stability.

To provide a polyfluorene that yields a cured product with excellent dielectric properties and flame retardancy. [Solution] The polyfluorene according to the embodiment has vinylbenzylfluorene units as constituent units, and 80 mol% or more of the total constituent units are fluorene units. The polyfluorene may also have alkylfluorene units as fluorene units in addition to vinylbenzylfluorene units.