307 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 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.

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 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 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 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 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 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.

The invention discloses a synthesis method of Peniterpheyl A. According to synthesis of a key structural unit furan ring, diphenyl ether is synthesized through a simple heating substitution reaction of a phenol derivative and a fluorobenzene derivative, then C-C direct oxidative coupling of double benzene rings in a molecule is achieved under a Pd / Ag catalytic system to synthesize the furan ring, and due to steric hindrance and guiding group effects, the furan ring can be synthesized into the furan ring. The product has high selectivity, does not need harsh reaction conditions, has simple synthesis steps, is suitable for large-scale production, does not need to widely screen specific strains and fermentation conditions compared with a method for obtaining a low-amount target compound from microbial fermentation separation, is simple and efficient, and can guarantee a large amount of compounds required by subsequent research and development.

Provided is a polyimide resin powder which contains a tetracarboxylic acid component and a diamine component. The tetracarboxylic acid component includes 3,3',4,4'-biphenyltetracarboxylic acid dianhydride and 2,3,3',4'-biphenyltetracarboxylic acid dianhydride. The diamine component includes p-phenylenediamine and m-phenylenediamine and / or 4,4'-diaminodiphenyl ether. The content of p-phenylenediamine is 70-98 mol% based on the total molar amount of the diamine component. The total content of m-phenylenediamine and 4,4'-diaminodiphenyl ether is 2-30 mol% based on the total molar amount of the diamine component.

The invention discloses a polyimide vibration film and a production process thereof, and relates to the technical field of polyimide. According to the invention, a 2, 2-bis (trifluoromethyl)-4, 4-diaminodiphenyl monomer is introduced into 4, 4 '-diaminodiphenyl ether, 3, 3, 4, 4-diphenyl ether tetracarboxylic dianhydride, 3, 3, 4, 4-biphenyl dianhydride and pyromellitic dianhydride monomers as a fifth monomer to participate in copolymerization; the prepared polyimide film is excellent in mechanical property, low in dielectric constant, high in elongation at break and stable in voltage breakdown resistance.

The application relates to the technical field of high polymer materials, and discloses a PE material containing nano reinforcing material and a preparation method thereof, which comprises the following raw materials: low-density polyethylene, nano reinforcing material, high-temperature-resistant additive component, a compatilizer, a lubricant and an antioxidant; the low-density polyethylene is used as a matrix, the nano reinforcing material is added, nano C60 is grafted with hyperbranched polyester, the compatibility of the nano C60 and the matrix is effectively improved, the agglomeration of the nano C60 in the matrix is avoided, the advantages of the nano C60 are better exerted, and the mechanical properties of the PE material are improved; the high-temperature-resistant additive component is added, the polyisoprene molecular chain with good flexibility is used to disperse and absorb external impact energy, the toughness of the matrix is improved, the diphenyl ether group high-temperature-resistant rigid ring is introduced into the polyisoprene structure, the compatilizer can be reacted with the matrix to be crosslinked in the processing process, and the high-temperature-resistant performance and the toughness of the PE material are further improved.

The invention relates to the technical field of environmental remediation, and particularly provides a bifunctional copper-based coordination polymer photocatalyst as well as a preparation method and application thereof.The bifunctional copper-based coordination polymer photocatalyst is prepared from copper chloride dihydrate, 4, 4 '-bis (3-pyridinecarboxamide) diphenyl ether and benzoic acid as main raw materials by adjusting reaction parameters. And reacting in a hydrothermal kettle to generate the bifunctional copper-based coordination polymer photocatalyst {[Cu2 (3-padpe) 2Cl2]. H2O} n. The method has the characteristics of simple process, low cost, high catalyst activity, good stability, reusability and the like, shows good application potential in repairing water bodies and soil polluted by organic matters and heavy metals, and provides a new research thought and insight for development of a novel multifunctional environment repairing agent.

The present application relates to the technical field of aromatic polyamide polymer, in particular to a modified poly-p-phenyleneterephthalamide fiber with high elongation at break and a preparation method thereof.The present application introduces a small amount of 3,4'-diamino diphenyl ether and a fourth monomer containing a bis-amino phenoxy functional group during polymerization, and controls the molar ratio of the third monomer and the fourth monomer in the total amount of diamine monomer, thereby to a certain extent, the rigid molecular chain structure of the conventional p-aramid is destroyed, while the breaking strength of the fiber is maintained, the elongation at break of the polymer fiber is enhanced, the modified poly-p-phenyleneterephthalamide can still be prepared by dry spraying wet spinning process, the cost of building a new production line in the factory is saved, the process conditions and parameters are optimized, the fiber with stable elongation at break index is obtained, and the prepared fiber has an elongation at break of more than 3.6%.

The invention relates to diphenyl ether compounds with anti-cryptococcus activity. The invention discloses an application of a diphenyl ether compound in preparation of a medicine for inhibiting the activity of cryptococcus. The compound has good inhibitory activity on multiple strains of cryptococcus sp. And is suitable for research on an anti-cryptococcus active lead compound or preparation of an anti-cryptococcus medicine.

The invention provides polyether sulphone and a preparation method thereof. The preparation method comprises the following steps: mixing a polar aprotic solvent, a bisphenol monomer and an alkaline substance, introducing protective gas, heating, dehydrating, cooling to T1, adding a diphenyl sulfone monomer, and carrying out heat preservation at T1 to carry out a first-stage polymerization reaction; adding a low-polarity solvent, heating to T2, and carrying out second-stage polymerization reaction to obtain polyether sulfone; wherein the low-polarity solvent is selected from one or a combination of more than two of normal hexane, cyclohexane, methylbenzene, ethylbenzene, biphenyl and diphenyl ether. By reducing or partially inhibiting the generation of the cyclic oligomer in the reaction process, the polyarylether sulfone with narrow molecular weight distribution and low content of the cyclic polymer is obtained. The method provided by the invention is simple and easy to implement, is convenient to control, avoids complex product purification and separation processes, and is beneficial to industrial implementation.

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.

Disclosed in the present invention are an acrylate emulsion for a polymer cement waterproof coating, a raw material composition thereof, a preparation method therefor, and a use thereof. The raw material composition comprises the following components in parts by weight: 3-4.5 parts of sodium dodecyl diphenyl ether disulfonate, 1.5-2.5 parts of acrylamide, 2-4 parts of fatty alcohol polyoxyethylene ether, 2-4 parts of polyethylene glycol dimethacrylate, 1-2 parts of acrylic acid, 0.5-1 part of titanium triisostearoylisopropoxide, 40-60 parts of acrylate, 0.5-1 part of sodium persulfate, 50-60 parts of deionized water, and 0.1-0.3 parts of a 10% sodium hydroxide solution. The acrylate emulsion prepared by the present invention has excellent performance and good dispersibility, and a polymer cement waterproof coating prepared by using the emulsion of the present invention has lower viscosity and better workability.

The present invention provides a polyimide film comprising, as polymeric units, dianhydride monomers comprising pyromellitic dianhydride (PMDA), and diamine monomers comprising 4,4'-methylenedianiline (MDA), meta-phenylenediamine (MPD), 4,4'-diaminodiphenyl ether (ODA), and para-phenylenediamine (PPD), the tensile strength and percent elongation of the polyimide film being 180 MPa or greater and 90% or greater, respectively.