369 results about "Diphenyl ether" patented technology

The invention relates to the technical field of organic chemical synthesis, in particular to a preparation method of 3, 4 '-diaminodiphenyl ether.The preparation method comprises the steps that S1, under inert gas and in a first solvent, m-dinitrobenzene and p-acetamidophenol are subjected to a heating reaction under the condition of a weak base catalyst, and 3-nitro-4-acetamido diphenyl ether is prepared; s2, in a second solvent, the 3-nitro-4-acetamido diphenyl ether is subjected to a hydrogenation reduction reaction, and 3-amino-4-acetamido diphenyl ether is prepared; and S3, dissolving the 3-amino-4-acetaminodiphenyl ether in an alcohol solvent system, adding an aqueous solution of alkali, controlling the reaction temperature, carrying out a hydrolysis reaction, and after the reaction is finished, carrying out post-treatment to obtain the 3, 4 '-diaminodiphenyl ether. The preparation method provided by the invention has the advantages of easily available raw materials, low price, good selectivity and high product yield, and is more suitable for industrial production by comprehensively considering economical efficiency and safety.

The invention relates to a high-temperature proton exchange membrane, in particular to a high-temperature proton exchange membrane based on silica cross-linked polybenzimidazole and a preparation method of the high-temperature proton exchange membrane. The preparation method comprises the following steps: polymerizing 3, 3 '-diaminobenzidine, 4, 4'-diphenyl ether dicarboxylic acid and 5-hydroxyisophthalic acid to form a polybenzimidazole main chain containing an ether bond and a phenolic hydroxyl group, grafting a silane coupling agent on the polybenzimidazole main chain, and finally carrying out membrane formation and acid catalysis treatment to obtain the high-temperature proton exchange membrane based on silica crosslinked polybenzimidazole. A silicon-oxygen network structure is introduced into a polybenzimidazole main chain, so that the phosphoric acid retention rate and the oxidation resistance of the polymer film can be effectively improved, and the service life of the polymer film is prolonged.

The invention provides a hot-melt bismaleimide resin matrix, a prepreg, a composite material and a preparation method thereof, and the hot-melt bismaleimide resin matrix is characterized by comprising the following preparation raw materials by mass: 70-100 parts of a bismaleimide resin monomer, 50-65 parts of a process modifier, 20-35 parts of an active diluent, 10-15 parts of a toughening modifier, and 10-20 parts of a heat-resistant modifier; wherein the bismaleimide resin monomer is one or a mixture of two of a diphenylmethane diamine type bismaleimide monomer and a diphenyl ether diamine type bismaleimide monomer. The hot-melt bismaleimide resin prepreg prepared by the method is stable in resin content, uniform in resin distribution, low in volatile matter content and good in laying property; and the prepared double-horse-based prepreg is suitable for various composite material forming processes, and the application field of the prepreg is expanded.

The invention belongs to the technical field of novel fertilizers, and particularly relates to a growth promoting type macroelement water-soluble fertilizer and a preparation method and application thereof.The fertilizer is prepared from, by weight, 4-6 parts of tertiary amine synergist, 220-230 parts of monopotassium phosphate, 350-360 parts of urea, 3-5 parts of compound amino acid, 3-5 parts of sorbitol and 15-20 parts of ethylene glycol, the invention relates to N, N '-tetra (2-fluorobenzyl diamido) diphenyl ether. The invention aims at innovating a macroelement water-soluble fertilizer product to prepare the novel tertiary amine synergist, so that the additional value and the use effect of the macroelement water-soluble fertilizer can be effectively improved, and a new direction and a new idea are provided for development and use of a new functional macroelement water-soluble fertilizer technology.

The invention provides a method for rapidly determining the content of 4, 4-dichlorodihydroxydiphenyl ether in a laundry detergent, and belongs to the technical field of detergent component content detection. According to the method, the content of 4, 4-dichlorodihydroxydiphenyl ether in the laundry detergent is measured by adopting a high performance liquid chromatography. In the determination process, an acetonitrile-water-sodium chloride three-phase mixture is used for removing impurities, and a mixed solution of acetonitrile and toluene is used as an extracting agent for solid-phase elution; a flowing phase A is an acetic acid aqueous solution with the pH value of 3.5-4, and a flowing phase B is acetonitrile. According to the method, the high performance liquid chromatography is combined with the solid phase extraction technology, high-sensitivity and high-accuracy determination can be achieved, a standard curve is established, and the reliability and accuracy of a result are further guaranteed. The method disclosed by the invention is simple to operate, good in stability and repeatability, and capable of accurately and rapidly measuring the content of 4, 4-dichlorodihydroxydiphenyl ether.

The invention discloses a polyimide hollow fiber gas separation membrane and a preparation method thereof. The polyimide hollow fiber gas separation membrane is prepared from a mixture containing polyimide and an additive through a phase inversion method, the polyimide is prepared by using 2, 2 '-bis (3, 4-dicarboxyphenyl) hexafluoropropane dianhydride as a dianhydride monomer and 1, 3-phenylenediamine and 4, 4'-diaminodiphenyl ether as diamine monomers through solution polycondensation. The weight-average molecular weight of the polyimide is greater than or equal to 60000. The prepared polyimide hollow fiber gas separation membrane is suitable for being applied to multiple fields such as air separation, hydrogen separation, decarburization and rare gas concentration, and the application prospect is wide.

The invention discloses a continuous preparation method of dodecyl diphenyl ether, and belongs to the technical field of organic synthesis. The continuous preparation method comprises the following steps: respectively injecting diphenyl ether, olefin and a catalyst into a micro-channel through a feeding pump and a gas flowmeter pump for reaction, collecting reaction liquid, and carrying out post-treatment on the reaction liquid to obtain dodecyl diphenyl ether. According to the method, a continuous preparation process is adopted, a gas catalyst is used, the use amount of the catalyst is greatly reduced, post-treatment steps are reduced, the reaction time is greatly shortened, meanwhile, the purity and yield of the product can reach 99% or above, and the reaction raw materials can be recycled and are green and environment-friendly.

According to the all-organic nonlinear insulating material based on the electron-donating group and the preparation method, polyolefin is used as a matrix of the material, and an organic small molecule filler containing the electron-donating group is introduced to form a uniformly dispersed composite structure, so that the nonlinear conductivity of the material is remarkably improved. The small organic molecules can be ethylene glycol diphenyl ether, nonylphenol polyoxyethylene ether, allyloxy polyoxyethylene ether or octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate, and the mass fraction of the filler is 0.1-3 wt%. The preparation method comprises the following steps: melting the polyolefin matrix at 110-120 DEG C, adding the small organic molecule filler, and blending for 10-30 minutes at the rotating speed of 50-70 r / min. The material has excellent electric field homogenization capability in a high electric field, avoids the problem of inorganic filler agglomeration, has relatively low filler content and excellent processability, can be widely applied to the field of high-voltage electrical equipment such as transformers, switch equipment and mutual inductors, and effectively improves the insulating property and prolongs the service life of the equipment.

The invention discloses a high-toughness polyetherketoneketone polymer and a preparation method thereof, and belongs to the technical field of macromolecular special engineering plastics. The high-toughness polyether ketone ketone polymer is obtained by reacting diphenyl ether, paraphthaloyl chloride, a compound 1 and anhydrous aluminum trichloride according to a molar ratio of 1: a: (1-a): (3-5), the value of a is 0.5-0.9, and the compound 1 is isophthaloyl chloride with a flexible polyether side chain. According to the high-toughness PEKK polymer disclosed by the invention, a flexible polyether side chain is introduced into a rigid polymer main chain, so that compared with a traditional PEKK polymer molecule with a pure rigid structure, the high-toughness PEKK polymer shows better flexibility, and harmony and unification of strength, rigidity and flexibility are realized.

The synthesis process comprises the following steps: (1) introducing inert gas into a reactor, adding a solvent, a Lewis acid catalyst and diphenyl ether, then dropwise adding an acyl chloride monomer solution, and synthesizing an intermediate M with a short-chain small molecular structure; (2) continuously dropwise adding an acyl chloride monomer solution into the reactor for reaction, and then adding an end-capping reagent for reaction; and (3) quenching, washing and drying the reaction product in the step (2) to obtain the product. Under the condition that only the Lewis acid is used as the catalyst, the one-pot method is adopted for synthesizing PEKK in two steps, side reactions can be reduced, meanwhile, the dosage of the catalyst is reduced, the production cost is reduced, the post-treatment process is simplified, and the obtained polyether ketone ketone is high in molecular weight and good in heat resistance and mechanical performance.

The present invention discloses a yellow-green fluorescent COFs material, its preparation method and application, belonging to the fields of covalent organic framework materials and analytical detection. In the present invention, 4,4',4'',4'''-(ethene-1,1,2,2-tetrayl)tetraphenylaldehyde (ETBA) and a flexible organic monomer 4,4'-diaminodiphenyl ether (ODA) with chelating sites are used as raw materials, methanol and acetic acid are added and shaken for dispersion, frozen with liquid nitrogen, evacuated and reacted in a constant temperature oven, the product is collected by filtration, washed with anhydrous N,N-dimethylformamide and tetrahydrofuran respectively, and then centrifuged and washed with anhydrous acetone, the solid product is collected, dried in an oven to obtain yellow ETBA-ODA-COF powder. The present invention regulates the π-π interaction in the COF structure, synthesizes a kind of ETBA-ODA-COF material with yellow-green fluorescence, and can establish a fluorescent nanoprobe to realize the analysis and detection of metal Fe 3+ , Hg 2+ ions and folic acid small molecules.

The invention provides a lithium ion battery electrolyte which comprises a lithium salt, a non-aqueous organic solvent, an additive A diphenyl ether and an additive B tris (trimethylsilyl) amine, the additive A is diphenyl ether containing a benzene ring and an ether group, the additive B is tris (trimethylsilyl) amine with a trimethylsilyl group, and the non-aqueous organic solvent is a non-aqueous solvent. The additive A enables the electrolyte to be rapidly spread and infiltrated on the surface of an electrode, the additive B enables the electrolyte to form a compact SEI film on the surface of a negative electrode, HF generated by side reaction can be removed, the negative electrode is better protected, the additive A and the additive B act together to improve the interface of the negative electrode, and the service life of the negative electrode is prolonged. And the high-temperature cycle performance of the battery can be improved.

The invention discloses a preparation method of polyetherketoneketone, polyetherketoneketone and application. The method comprises the following steps: (1) mixing raw materials at a first temperature, the raw materials comprising acyl chloride, a solvent, Lewis base, diphenyl ether and Lewis acid, carrying out heat preservation, heating to a second temperature, and carrying out a first reaction stage; (2) heating to a third temperature for reaction, and carrying out a second reaction stage; (3) adding a terminator into the reaction mixture in the step (2); the heating rate in the step (1) and the heating rate in the step (2) are respectively and independently 0.1-5 DEG C / min, the weight-average molecular weight of the polyetherketoneketone prepared by the method is 5000-200000, and the molecular weight distribution coefficient is 2.5-4.5. The polyetherketoneketone with relatively narrow molecular weight distribution is obtained through an electrophilic substitution path.

The present invention provides a medical repair dressing, a preparation method thereof and a medical patch. The preparation method of the medical repair dressing includes: under a catalyst and a first inert atmosphere, heating and reacting 4,4'-bis(dimethylhydroxysilyl) diphenyl ether with hexamethylene-1,6-diisocyanate to obtain an isocyanate group-terminated polyurethane; under a second inert atmosphere, subjecting the isocyanate group-terminated polyurethane to a capping reaction with 3-aminopropylmorpholine to obtain a morpholine-capped organosilicon-modified polyurethane; after mixing the morpholine-capped organosilicon-modified polyurethane with an organic solvent, performing spinning, drawing, web-forming and hot rolling in sequence to obtain the medical repair dressing. Using it as the backing layer of the medical patch can greatly improve the air permeability and water resistance of the medical patch, thereby effectively improving the use effect of the medical patch and prolonging its service life.

The present invention provides a hot-melt bis-maleimide resin matrix, prepreg, composite material and preparation method thereof. The hot-melt bis-maleimide resin matrix is characterized in that its preparation raw materials include the following components in parts by mass: 70-100 parts of bis-maleimide resin monomer, 50-65 parts of process modifier, 20-35 parts of reactive diluent, 10-15 parts of toughening modifier, and 10-20 parts of heat resistance modifier; wherein, the bis-maleimide resin monomer is one or a mixture of two of diphenylmethane diamine type bis-maleimide monomer and diphenyl ether diamine type bis-maleimide monomer. The hot-melt bis-maleimide resin prepreg prepared by this method has stable resin content, uniform resin distribution, low volatile content, and good drapability of the prepreg; and the prepared bis-maleimide based prepreg is applicable to a variety of composite material forming processes, expanding the application field of the prepreg.

The present invention belongs to the technical field of organic synthesis, and specifically relates to a synthesis process of high-yield 1,4-bis(4-phenoxybenzoyl)benzene. The process is mainly prepared by using excess diphenyl ether and terephthaloyl chloride as reaction raw materials, using o-dichlorobenzene as reaction solvent, and under the catalytic action of aluminum chloride. The synthesis process of 1,4-bis(4-phenoxybenzoyl)benzene provided by the present invention successfully overcomes many challenges existing in traditional synthesis methods, such as many side reactions, low yield, and purification difficulties, by optimizing key parameters such as reaction conditions, solvent selection, catalyst dosage, and sample addition order. It is not only easy to operate, but also significantly improves the yield of the target compound, and also ensures the high purity and low impurity content of the product.

The invention relates to the technical field of high-molecular polymerization and molding, in particular to a modified para-aramid stock solution, a preparation method and para-aramid fibers.The preparation method comprises the steps that under the inert gas condition, diamine and a chlorosilane polycondensation agent react in a weakly-alkaline polar aprotic solvent, and a silanization modified diamine solution is obtained; the diamine comprises diaminodiphenyl ether and p-phenylenediamine; adding paraphthaloyl chloride into the silanization modified diamine solution to carry out a copolymerization reaction, and after the reaction is finished, carrying out neutralization treatment to obtain the modified para-aramid stock solution. According to the preparation method of the modified para-aramid stock solution, the modified diamine does not need to be independently purified, the high-viscosity modified para-aramid stock solution can be directly obtained, and the modified para-aramid stock solution is high in polymer specific concentration logarithmic viscosity and high in molecular weight, so that a high-quality and stable-quality para-aramid fiber product is more favorably obtained.

The invention relates to a method for preparing 4, 4 '-diaminodiphenyl ether. According to the method, 4, 4 '-dinitrodiphenyl ether is used as an initial raw material, and 4, 4'-diaminodiphenyl ether is prepared through catalytic hydrogenation reduction of a supported catalyst; in the preparation of the catalyst, the dispersion degree of the metal active component on the carrier is improved by virtue of the membrane dispersion microreactor on the premise of not using a surfactant, the metal dosage is reduced, the supported structure is integrally formed, and continuous production of the catalyst precursor is realized. The preparation process provided by the invention is more green and efficient, is applied to hydrogenation reduction of 4, 4 '-dinitrodiphenyl ether under mild reaction conditions, shows excellent performance, and reduces the production cost.

The invention discloses a polyimide dielectric film and a preparation method and application thereof, and belongs to the field of materials. The preparation method comprises the following steps: dissolving PDA in a solvent, adding cesium fluoride, stirring for 20-35 minutes in an oxygen-free environment, reacting for 18-20 hours at the temperature of 75-85 DEG C under a stirring condition, and filtering a reaction mixture to finally obtain the FPDA. The preparation method comprises the following steps: dissolving FPDA in a solvent, adding diphenyl ether dianhydride in batches under the condition of-5-5 DEG C, stirring for 8-10 hours to obtain a polyamide acid PAA solution, dripping the solution on a glass substrate, carrying out thermal imidization reaction treatment, placing the glass substrate in deionized water after the reaction is finished, and stripping the film to obtain the film with the thickness of 1-20 microns. The product prepared by the invention has lower leakage current loss, higher glass transition temperature and charge-discharge efficiency, and comprehensive and excellent energy storage characteristics.

The invention discloses a water treatment filtering material and a preparation method thereof, and relates to the technical field of water treatment. When the water treatment filtering material is prepared, alkaline lignin, epichlorohydrin and triethylenetetramine are subjected to a reaction through a reverse suspension cross-linking technology, and lignin porous microspheres are prepared; carrying out reaction on the lignin porous microspheres and picolinamide ligands to obtain modified lignin porous microspheres; 3-mercaptopropyltriethoxysilane and titanium dioxide are subjected to a reaction, and modified titanium dioxide is prepared; the preparation method comprises the following steps: reacting pyromellitic dianhydride, 1, 4-diaminobutylene and 4 ', 4-diaminodiphenyl ether to prepare functionalized polyamide; the functional polyamide, the modified lignin porous microspheres and the modified titanium dioxide are prepared into a spinning solution, and a polyamide membrane is prepared through electrostatic spinning; and carrying out liquid reaction on bromohexane on the polyamide membrane to obtain the water treatment filtering material. The prepared water treatment filtering material has excellent antibacterial property, heavy metal adsorption property, dye removal property and mechanical property.

The invention discloses a preparation method of 4-phenoxyphenylboronic acid, and belongs to the technical field of organic synthesis. The preparation method comprises the following steps: by taking diphenyl ether as a raw material, reacting with fuming nitric acid under the action of tris (pentafluorophenyl) boron, so as to generate a 4-nitrodiphenyl ether intermediate; generating 4-aminodiphenyl ether from the 4-nitrodiphenyl ether intermediate under the action of tetrahydroxy diboron and a catalyst, and then generating 4-phenoxyphenylboronic acid from the 4-aminodiphenyl ether and excessive tetrahydroxy diboron under the action of tert-butyl nitrite. In the first step of the route, the positioning selectivity of 4-position nitro is increased through specific Lewis acid, in the second step, nitro reduction and boronation are carried out through a continuous one-pot method, and the synthesis method of the compound is enriched.

The invention provides an adhesive and a multilayer structure. The adhesive comprises a polyimide, the polyimide is a reaction product of a reactant (a) and a reactant (b), the reactant (a) is a first diamine, or the reactant (a) is composed of the first diamine and a second diamine, and the reactant (b) is composed of a first dianhydride and a second dianhydride, wherein the first diamine is a diamine having a diphenyl ether group, the first dianhydride is a dianhydride having a diphenyl ether group, the second diamine is a diamine not having a diphenyl ether group, and the second dianhydride is a dianhydride not having a diphenyl ether group, the sum of the weight percentages of the first diamine and the first dianhydride being 55 wt% to 94 wt%, and the sum of the weight percentages of the second diamine and the first dianhydride is 55 wt% to 94 wt%. The total weight of the reactant (a) and the reactant (b) is taken as the reference.

The invention relates to a polyimide composite film for realizing high-dispersion carbon nanotubes through chemical anchoring and a preparation method of the polyimide composite film, which are used for solving the problems that carbon nanotubes in the existing carbon nanotube / polyimide composite material are easy to agglomerate, poor in interfacial compatibility and low in grafting efficiency. The preparation method comprises the following steps: S1, ultrasonically dispersing aminated carbon nanotubes in anhydrous dimethylacetamide to obtain a stable dispersion liquid; s2, slowly dropwise adding pyromellitic dianhydride into the stable dispersion liquid under an ice bath condition, and enabling the pyromellitic dianhydride to react with the aminated carbon nanotubes under the assistance of triethylamine to form anchor points; s3, adding a diamine monomer 4, 4 '-diaminodiphenyl ether, and gradually adding the residual pyromellitic dianhydride to carry out in-situ polymerization; and S4, preparing a wet film by adopting a curtain coating or spin coating method, and carrying out step-by-step thermal imidization at 80-300 DEG C to obtain the covalent composite film. Controllable covalent connection of the carbon nanotubes and pure polyimide chain segments can be achieved on the molecular level, and therefore the composite film with excellent heat conductivity, electromagnetic shielding performance and mechanical performance is obtained.

The invention relates to the technical field of nano materials, and provides a preparation method and application of a friction nano generator with high surface charge density. The invention aims to overcome the defects of low surface charge density, environmental influence, easy aging and the like in high-frequency mechanical energy collection of the existing friction nano-generator, and the application of the friction nano-generator in environmental mechanical energy collection is improved. The main scheme is as follows: 4, the preparation method comprises the following steps: dissolving 4, 4 '-diaminodiphenyl ether in N, N'-dimethylacetamide, adding diphenyl ether dianhydride into the solution to synthesize a polyamide acid solution, carrying out electrospinning and high-temperature treatment on the solution to obtain an imidized nanofiber membrane, treating the surface of the nanofiber membrane through a plasma sputtering instrument, selecting a fluorinated ethylene-propylene copolymer as an electric negative electrode material, and carrying out electrospinning and high-temperature treatment on the surface of the nanofiber membrane. And pasting an electrode and packaging to construct the friction nano generator. The invention is used in the fields of friction power generation, mechanical sensing and the like, and has the advantages of simple process, high preparation speed, high yield, low cost, good robustness, no environmental influence and high output performance.

The application discloses a kind of temporary bonding glue and its application.Temporary bonding glue includes polyimide, the polyimide includes big conjugate unit, the conjugate atom number of big conjugate unit is greater than or equal to 40, and big conjugate unit includes at least one of diphenyl ether group, fluorenyl group or indane structural unit;The polyimide further includes at least one of benzotriazole group, nitro group.The application is improved on the structure of polyimide, and the temporary bonding glue is used in wafer processing, so that the absorbance of temporary bonding glue at target debonding wavelength 355nm is significantly increased, thereby significantly reducing threshold debonding energy, and it is expected to reduce the risk of wafer warping, cracking, or surface device failure, improve the life of laser and debonding efficiency.

The invention relates to the technical field of catalyst preparation, and discloses a carbon modified copper-based catalyst and a preparation method and application thereof. The method comprises the following steps: (1) sequentially carrying out coprecipitation and aging on an alkaline precipitant solution, a metal salt solution and an anion modifier solution to obtain an intermediate product I; and (2) under the condition that the oxygen concentration is not higher than 5% by volume, roasting the intermediate product I to obtain the carbon modified copper-based catalyst, the anion modifier solution contains sodium dodecyl diphenyl ether disulfonate and sodium gluconate in a molar ratio of 1: (1-10); the pH value of the anion modifier solution is 9-11; the metal salt solution contains zinc salt, copper salt and aluminum salt. The prepared carbon modified copper-based catalyst has the advantages of high conversion per pass of carbon dioxide, low activation temperature, high methanol selectivity, long-period operation and stable structure.

The application provides a porous carbon nanofiber electrocatalyst loaded with cobalt / lanthanum hydroxide heterojunction and a preparation method. The preparation method comprises the following steps: adding 4,4-diamino diphenyl ether and pyromellitic dianhydride into a solvent, uniformly mixing, and preparing a polyamide acid precursor spinning solution; electrospinning the prepared polyamide acid precursor spinning solution to prepare polyamide acid nanofibers; immersing the prepared polyamide acid nanofibers in a mixed metal salt solution containing cobalt salt, lanthanum salt and zinc salt to prepare polyamide acid nanofiber precursors loaded with metal ions; and performing programmed temperature heat treatment on the prepared polyamide acid nanofiber precursors loaded with metal ions in a protective atmosphere to prepare the porous carbon nanofiber electrocatalyst loaded with cobalt / lanthanum hydroxide heterojunction. The prepared porous carbon nanofiber electrocatalyst loaded with cobalt / lanthanum hydroxide heterojunction has excellent electrochemical oxygen reduction reaction and oxygen evolution reaction bifunctional catalytic activity.

The invention relates to a catalytic hydrolysis method of waste epoxy resin, which comprises the following steps: putting the waste epoxy resin into a reaction kettle, adding ultrapure water, adding a small amount of sodium dodecyl diphenyl ether disulfonate surfactant and a boron trifluoride acetic acid catalyst, and carrying out hydrolysis reaction to realize catalytic degradation of the epoxy resin. Degradation products can be converted into epoxy monomers and anhydride monomers, so that cyclic utilization is realized. Compared with the prior art, the degradation method provided by the invention is not only green and safe, but also high in degradation efficiency, solves the problem that the waste epoxy resin cannot be recycled, saves resources, meets the green development requirement, and has practical engineering application value.

The present invention relates to the technical field of polymer synthesis and processing, and particularly relates to an aromatic polyoxadiazole film with high solubility and high flame retardancy and a preparation method thereof. The preparation method is as follows: a condensation reaction and a sulfonation reaction are carried out on biphenyl dicarboxylic acid, diphenyl ether dicarboxylic acid and a flame retardant dicarboxylic acid monomer to obtain an aromatic polyoxadiazole solution; the aromatic polyoxadiazole solution is cast into filaments, washed, pulverized and dried to obtain polyoxadiazole powder; after the polyoxadiazole powder is dissolved in a solvent, it is coated and dried to obtain the polyoxadiazole film. The flame retardant dicarboxylic acid monomer is at least one of 2-(diphenylphosphoryl) terephthalic acid and 10-(2,5-dicarboxyphenyl)-10H-9-oxa-10-phosphaphenanthrene-10-oxide. The polyoxadiazole film has high flame retardancy, and after using the flame retardant dicarboxylic acid monomer to participate in the condensation reaction to prepare the film, it has good solubility, high solid content and is easier to process.

The present invention discloses a polyimide vibrating film and a production process thereof, relating to the technical field of polyimides. By introducing 2,2-bis(trifluoromethyl)-4,4-diaminobiphenyl monomer as a fifth monomer into 4,4'-diaminodiphenyl ether, 3,3,4,4-diphenyl ether tetracarboxylic dianhydride, 3,3,4,4,-biphenyl dianhydride, and pyromellitic dianhydride monomers, the prepared polyimide film exhibits excellent mechanical properties, a low dielectric constant, a high elongation at break, and stable voltage breakdown resistance.