173 results about "M-aminophenol" patented technology

The invention discloses a fluorescence ratio type carbon dot hydrogel sensor, a preparation method thereof and application of the fluorescence ratio type carbon dot hydrogel sensor in rapid detection of doxorubicin hydrochloride. The invention discloses a fluorescence ratio type carbon dot hydrogel sensor which is characterized in that 3-aminophenol is used as a carbon source, absolute ethyl alcohol is used as a solvent, carbon dots are prepared through a one-step solvent method, the carbon dots have green fluorescence, agarose is dissolved in a mixed solution of deionized water and a phosphate buffer solution to be fully dissolved, and then the carbon dots are prepared into the fluorescence ratio type carbon dot hydrogel sensor. And adding the carbon dots into the mixed solution, fully dispersing, and cooling to obtain the fluorescence ratio type carbon dot hydrogel sensor. The sensor disclosed by the invention has the characteristics of high selectivity and high sensitivity when being used for detecting doxorubicin hydrochloride, and also has the characteristics of convenience, visibility, rapidness, portability, easiness in operation and the like.

The invention discloses p-aminophenol polyether polyol, a preparation method of the p-aminophenol polyether polyol, and application of the p-aminophenol polyether polyol in an all-water foaming polyurethane open-cell system. The structure of the p-aminophenol polyether polyol is shown as follows: # imgabs0 # n is 5-10, and m is 1-5. The p-aminophenol polyether polyol contains benzene rings, has good compatibility with high-molecular polyether and a flame retardant TCPP, contains ether bonds, and has good compatibility with water. Meanwhile, the benzene ring structure has certain rigidity, and certain strength can be provided for all-water low-density polyurethane open-cell foam. The p-aminophenol polyether polyol can be used as main polyether of an all-water foaming polyurethane open-cell system, and compared with a traditional all-water foaming polyurethane open-cell system, the p-aminophenol polyether polyol has the advantages of being good in compatibility, high in latitude, high in compression strength, low in cost and the like.

The invention belongs to the technical field of sensors, and relates to an array sensor based on cerium-based metal organic framework nano-enzyme and detection application of perfluoroalkyl compounds. The array sensor is a Ce-MOF triple enzyme activity array sensor and is provided with a plurality of mutually independent sensing channels; the sensing channel contains a Ce-MOF nano enzyme and a chromogenic substrate; the chromogenic substrates comprise a first chromogenic substrate, a second chromogenic substrate and a third chromogenic substrate, the first chromogenic substrate comprises 3, 3 ', 5, 5'-tetramethyl benzidine, the second chromogenic substrate comprises 2, 4-diaminophenol and 4-aminoantipyrine, and the third chromogenic substrate comprises xanthine, purine oxidase and nitrogen blue tetrazole. The MOF nano-enzyme array sensor constructed by the invention has relatively high sensitivity and selectivity in identification and distinguishing of PFASs compounds, not only can accurately distinguish single PFASs compounds, but also can perform quantitative detection, and has good response to PFASs with different concentrations.

The invention discloses a carbon dioxide adsorption material and a preparation method and application thereof.The preparation method comprises the steps that in the presence of a surfactant, aminophenol and aldehyde are subjected to a condensation polymerization reaction in an alcohol-water mixed system, organic amine is added in the condensation polymerization reaction process, a reaction is conducted, and modified phenolic resin sol is prepared; adding nano oxide with surface hydroxyl into the modified phenolic resin sol, uniformly dispersing, and aging under a heating condition to prepare modified gel; carrying out solvent replacement on the modified gel in the aging solution to obtain aged gel, and drying the aged gel to obtain the carbon dioxide adsorption material. According to the method disclosed by the invention, the volume shrinkage of the aerogel material can be obviously reduced when normal-pressure drying is adopted, the problem that the gel prepared by the existing method is easy to collapse in structure and the like when being dried at normal pressure can be avoided, and better adsorption performance and the like are taken into account while the cost is reduced.

The invention discloses a fluorine coating melt-extruded on the surface of a polyimide film and a preparation method of the fluorine coating, and relates to the technical field of coating materials. The fluorine coating melt-extruded on the surface of the polyimide film is prepared by melt-mixing a component A, a component B and a fluorine-containing polymer, melt-extruding and coating the mixture on the surface of the polyimide film, the component A is a hydroxyl mixture, and the component B is an end-capped prepolymer; the hydroxyl mixture comprises hydroxyl terpyridine and hydroxyl fluorocarbon resin, the hydroxyl terpyridine is prepared by reacting diacetylpyridine with 3, 4-dihydroxyethoxy benzaldehyde, the 3, 4-dihydroxyethoxy benzaldehyde is prepared by reacting 3, 4-dihydroxybenzaldehyde with 2-chloroethanol, and the hydroxyl fluorocarbon resin is prepared by reacting 3, 4-dihydroxybenzaldehyde with 2-chloroethanol. The hydroxyl fluorocarbon resin is prepared by reacting butyl acrylate, hexafluorobutyl acrylate, dodecafluoroheptyl methacrylate, methacrylic acid and 2-hydroxyethyl methacrylate; the fluorine-containing polymer is prepared by carrying out a reaction on p-aminobiphenyl, 2, 3, 5, 6-tetrafluoroterephthalaldehyde and sodium triacetoxyborohydride, and the p-aminobiphenyl is prepared by carrying out a reaction on decafluorobiphenyl and 4-aminophenol; and the water resistance of the polyimide film coated with the fluorine coating is ensured.

The invention discloses a method for synthesizing p-aminophenol through electrolytic reduction, which comprises the following steps: carrying out electrolysis by adopting a diaphragm electrolytic cell and taking an oxidation reaction of hydrogen as an anode reaction, taking a reduction reaction of nitrobenzene as a cathode reaction, taking a sulfuric acid aqueous solution as an anode liquid and taking an aqueous solution containing nitrobenzene and sulfuric acid as a cathode liquid, and recycling an electrolysis product in the cathode liquor to obtain the p-aminophenol. According to the invention, the oxidation reaction of hydrogen is used as the anode reaction, a membrane electrode or a gas diffusion electrode is preferably used as the anode, and an iridium oxide anode and a lead anode are not used, so that the cost is effectively reduced or pollution is avoided; the electrolytic reaction is carried out under the condition that the pressure intensity of the anode chamber is not lower than that of the cathode chamber, the electrolytic voltage is reduced by about 1.6-2.3 V (compared with an iridium oxide anode), the energy consumption is obviously reduced, and the yield of p-aminophenol is improved by about 10%.

The invention provides a preparation method of a diaminophenol compound, and relates to the field of organic synthesis. The invention provides a preparation method of a diaminophenol compound, which comprises the following steps: in the presence of a metal catalyst, a reducing agent and a reaction solvent, carrying out reduction reaction on a compound 1, and separating a compound 2 crude product from reaction liquid; and dissolving the compound 2 in an acidic aqueous solution, mixing with hydrazine hydrate or a hydrazine hydrate solution, and crystallizing to obtain the compound 2. The method not only can effectively control the content of metal ions formed by the main components of the metal catalyst used in the reduction process in the final product, but also can effectively prevent the final product from being oxidized in the post-treatment process, thereby effectively improving the appearance of the final product. # imgabs0 #

The invention relates to the technical field of building materials, in particular to a method for preparing high-strength flow-state solidified soil by utilizing industrial solid waste, which comprises the following steps: taking industrial solid waste mixed materials such as steel slag, mineral powder, ardealite, carbide slag and the like as a curing agent, taking redundant soil as raw material soil, taking modified coconut fiber as a reinforcement material, and introducing a composite tackifier to prepare the high-strength flow-state solidified soil. The preparation method comprises the following steps: firstly, epoxidizing coconut shell fibers, and then performing one-pot reaction on the epoxidized coconut shell fibers, branched polyethyleneimine and triglycidyl p-aminophenol to obtain amino-terminated hyperbranched coconut shell fibers serving as modified coconut shell fibers; vinyl-terminated epoxy organic silicon, isopentenol polyoxyethylene ether, N, N-dimethylacrylamide and acrylic acid are used as raw materials to synthesize the composite tackifier, so that the durability of the fluid-state solidified soil is greatly improved.

The utility model discloses an automatic deslagging device for a catalyst in p-aminophenol production, and particularly relates to the technical field of chemical equipment, the automatic deslagging device comprises a base, the top of the base is fixedly connected with a supporting column, the front side of the supporting column is fixedly connected with two fixing rings, and the interiors of the two fixing rings are fixedly connected with a mixed deslagging mechanism; wherein the mixing deslagging mechanism comprises a mixing barrel, a mixing funnel is fixedly connected to the top of the inner wall of the mixing barrel, a discharging pipe is fixedly connected to the bottom of the mixing funnel, a rear cover is fixedly connected to the top of the mixing barrel, and two movable seats are fixedly connected to the top of the rear cover. By arranging the mixing and deslagging mechanism, the motor drives the rotating rod and the first mixing plate to repeatedly turn over aminophenol and a solid catalyst up and down, so that the aminophenol and the solid catalyst are mixed more sufficiently, and the reaction is more sufficient; meanwhile, aminophenol and a solid catalyst which are subjected to mixed reaction can quickly fall off through a discharging scraper, so that the production efficiency is improved.

This invention discloses a weather-resistant, high-hardness composite anti-corrosion coating and its preparation method, belonging to the field of anti-corrosion coating technology. The preparation method includes: firstly, synthesizing an epoxy resin containing dynamic disulfide bonds by reacting dithiodibenzoic acid and epichlorohydrin in an alkaline aqueous phase; secondly, constructing a low surface energy siloxane network using hydroxyl-terminated polydimethylsiloxane and methyltriethoxysilane; subsequently, introducing chlorzoxazone and N-acetyl-p-aminophenol as composite organic corrosion inhibitors, blending them with the resin to obtain a composite base material; finally, adding graphene, carbon nanotubes, and inorganic anti-corrosion fillers, and cross-linking and curing to form a film using a polyamine curing agent. This invention suppresses microcracks through the dynamic stress relief of disulfide bonds, combined with the weather-resistant barrier of the siloxane network, the active interface passivation of the heteroatom corrosion inhibitor, and the three-dimensional synergistic mechanical bonding of carbon-based nanomaterials, achieving a perfect unity of ultra-strong corrosion resistance, excellent weather resistance, and high mechanical hardness in the coating.

The invention discloses a synthesis method of 5-nitro-2-aminophenol, which comprises the following steps: by using 2-chloro-4-nitroaniline as a raw material, providing an amino protecting group by using di-tert-butyl dicarbonate ester to obtain a compound 3; carrying out hydrolysis reaction in an alkaline environment to hydrolyze chlorine groups on benzene rings into hydroxyl groups to obtain a compound 4; and removing an amino protecting group under an acidic condition to obtain the 5-nitro-2-aminophenol. According to the method, 2-chloro-4-nitroaniline is used as a starting raw material, compared with expensive ortho-aminophenol, the cost of the raw material can be remarkably reduced, use of expensive catalysts in the hydrolysis process is avoided through amino protection, generation of the byproduct 2-amino-4-nitrophenol is effectively reduced, and the yield of the 2-chloro-4-nitrophenol is increased. And the synthesized 5-nitro-2-aminophenol has relatively high purity (99.5%) and relatively high yield (-86%). The method has the advantages of conventional production steps and conventional process equipment, and has a good application prospect.

The invention provides a catalyst component for olefin polymerization, a preparation method and application of the catalyst component, a catalyst containing the catalyst component and used for olefin polymerization and application of the catalyst. The catalyst component comprises a reaction product of a sulfur-containing magnesium compound as shown in a formula (I), a titanium compound and an internal electron donor compound, in the formula (I), R1 is selected from C1-C8 alkyl groups or C3-C8 cycloalkyl groups; r2 and R3 are the same or different and are independently selected from hydrogen or C1-C5 alkyl groups, and hydrogen on the alkyl groups can be optionally substituted by halogen atoms; x is halogen, preferably chlorine or bromine; m ranges from 0.1 to 1.9, n ranges from 0.1 to 1.9, and m + n = 2, 0lt; q < = 0.5; the internal electron donor compound comprises a 1, 3-diether compound and an aminophenol compound. When the catalyst component for olefin polymerization provided by the invention is used for olefin polymerization, the hydrogen regulation sensitivity is relatively low, the stable control of the melt index of the product is facilitated, and the melting point of the prepared polymer product is lower.

The invention discloses an oil exploitation aid and a preparation method thereof, and relates to the technical field of oil exploitation aids. The oil exploitation aid comprises the following raw materials in parts by weight: 30-40 parts of a modified carboxylate surfactant, 15-20 parts of a nonionic surfactant, 5-6 parts of a cosolvent, 4-6 parts of a stabilizer, 3-5 parts of an anti-scaling agent and 140-160 parts of deionized water. The preparation method comprises the following steps: firstly, carrying out a ring-opening acylation reaction by taking n-hexylamine, 1, 8-naphthalic anhydride and 12-bromo-1-dodecene as raw materials, carrying out an alkylation reaction to obtain 1-(dodecyl-11-ene-1-yl (amyl) carbamoyl)-2-sodium naphthoate, then carrying out a reaction with a first-generation polymer prepared from urotropine and p-aminophenol, and carrying out a reaction to obtain the 1-(dodecyl-11-ene-1-yl (amyl) carbamoyl)-2-sodium naphthoate. Finally, the modified carboxylate type surfactant is obtained. The oil exploitation auxiliary agent prepared by the invention has the effects of changing the wettability of a rock core and preventing swelling of clay, and the recovery rate of oil displacement of a low-permeability reservoir is improved.

The present invention is a preparation method and application of N-Carbon@Ag-void@SiO2 egg yolk-eggshell structure nanocatalyst. The method first prepares 3-aminophenol formaldehyde resin microspheres@SiO2 core-shell structure nanoparticles, and then, the Ag in the medium + Through the SiO2 shell, it contacts with the amino groups on the surface of 3-APF and converts Ag into + The Ag nanoparticles are then in situ reduced to Ag nanoparticles and fixed to the 3-APF surface. Finally, the Ag-loaded 3-APF@Ag@SiO2 core-shell nanoparticles are carbonized. Due to the coordination between the Ag nanoparticles and the nitrogen atoms on the core, the Ag nanoparticles migrate as the core shrinks during carbonization, ultimately forming the N-Carbon@Ag-void@SiO2 yolk-eggshell nanocatalyst. This method eliminates the complex template removal process, resulting in a simple, low-cost method suitable for large-scale preparation.

The invention relates to the field of optical fiber ribbons, and discloses a high-fiber-density windable optical fiber ribbon and a preparation method thereof.The high-fiber-density windable optical fiber ribbon comprises a plurality of optical fibers arranged side by side and a photocuring product of a bonding resin composition, the bonding resin composition comprises modified epoxy acrylate, a photoinitiator, a reactive diluent and a modified multi-walled carbon nanotube; the modified epoxy acrylate is prepared by polymerizing a hydroxyl-terminated intermediate prepared by reaction of 4-hydroxy-3-trifluoromethyl benzaldehyde and 4-aminophenol with a silicon-containing epoxy group intermediate to prepare hyperbranched epoxy resin, and introducing acrylic acid for reaction; the silicon-containing epoxy group intermediate is prepared by reacting phenyl tri (dimethyl siloxane) silane with allyl glycidyl ether; and the modified multi-walled carbon nanotubes are prepared by carrying out chemical silver plating on the multi-walled carbon nanotubes by adopting a silver ammonia method. The optical fiber ribbon prepared by the invention has good mechanical properties, high-temperature and high-humidity resistance, antistatic property and flame retardance.

The utility model discloses a p-aminophenol catalyst circulating device, and particularly relates to the technical field of catalyst circulating production, which comprises a fixed box, a heating mechanism is arranged in the fixed box, a feeding box is arranged at the top of the fixed box, a feeding cylinder is arranged at the top of the feeding box, and a discharging cylinder is arranged at the bottom of the fixed box. A feeding mechanism is arranged in the feeding cylinder and comprises a feeding pipe arranged at the top of the feeding cylinder, a filter screen is arranged at the bottom of the feeding cylinder, a motor is arranged on one side of the feeding box, the output end of the motor is coaxially in transmission connection with a rotating shaft, and the rotating shaft is sleeved with a movable plate. Wherein a sealing ring is arranged on the surface of the movable plate, a sealing ring is arranged on one side of the movable plate, and an infrared sensor is arranged at the top of the sealing ring. According to the utility model, cyclic utilization of a catalyst and accurate control of reaction conditions can be realized, so that a powerful guarantee is provided for long-term stable operation of the device.

The invention discloses a method for preparing p-aminophenol through nitrobenzene hydrogenation, which comprises the following steps: adding a few-layer graphene coated Ni catalyst, an acid, nitrobenzene and a solvent into a polytetrafluoroethylene lining, ultrasonically mixing uniformly, then putting into a reaction kettle, sealing, replacing air in the reaction kettle with hydrogen, and reacting for 2-4 hours; and raising the temperature to a reaction temperature for reaction to obtain aminophenol. The few-layer graphene coated Ni catalyst is used for catalyzing nitrobenzene hydrogenation to prepare p-aminophenol, the synthesis route of the catalyst is simple, raw materials are cheap and easy to obtain, and compared with a traditional reduction method (such as iron powder reduction), the catalytic hydrogenation route is more environmentally friendly, high in atom utilization rate, easy and convenient to operate and high in economic benefit. The obtained few-layer graphene coated Ni catalyst has the advantages of mild reaction conditions, high product selectivity, easiness in separation and recovery, good cycling stability and the like in catalyzing nitrobenzene hydrogenation to prepare p-aminophenol.

Compositions comprising oils of plant or animal origin, such as fatty acid alkyl esters, are stabilized against oxidation using oxidized aminophenol antioxidants. The aminophenol includes one or two carbon-containing groups including hydroxyl groups and / or ether groups separated from an N atom by one or more carbon atoms. The oxidized aminophenol antioxidants effectively control oxidation in moderate and even low amounts, can be used in a variety of different oil and fatty acid methyl ester formulations, and are effective at elevated temperatures, and exhibit significantly superior performance to conventional antioxidants.

Disclosed are a resin substrate-based iron oxyhydroxide desulfurizing agent and a preparation method therefor, falling within the technical field of gas purification and treatment. In the present disclosure, sodium percarbonate is used as a raw material to prepare iron oxyhydroxide. Sodium percarbonate serves both as an alkaline precipitant and as an oxidant. P-aminophenol and formaldehyde are subjected to condensation polymerization to form linear phenolic resin, which is then modified with terephthalyl alcohol to connect into a cross-linked network structure resin. The resin is used as a substrate to obtain the resin substrate-based iron oxyhydroxide desulfurizing agent. The preparation method of the present disclosure is simple and achieves a larger sulfur capacity and desulfurization efficiency, making it suitable for the removal of hydrogen sulfide from waste gas.

The invention relates to the technical field of electrochemical materials, and particularly discloses Mo2C loaded N and P co-doped carbon nanospheres as well as a preparation method and application thereof. The preparation method comprises the following steps: by taking 3-aminophenol-formaldehyde phenolic resin nanospheres as a carbon precursor, forming a uniform Mo-EDTA (Ethylene Diamine Tetraacetic Acid) complex by utilizing a polydentate coordination effect of EDTA on Mo ions; when one-step carbonization is carried out in an inert atmosphere, EDTA serves as a molecular cage to inhibit Mo2C nano-particle agglomeration and realize monodisperse anchoring, and N and P sources are released in situ to complete double-heteroatom uniform doping. The catalyst shows excellent catalytic performance in a water electrolysis hydrogen production performance test: in a 1M KOH electrolyte, when the current density is 10mA / cm < 2 >, the overpotential is less than or equal to 80mV, and the Tafel slope is 95-105mV / dec. The long-term stability is good, hydrogen evolution is continuously conducted for 23 h under the current density of 50 mA / cm < 2 >, and the current retention rate is larger than or equal to 90%.

The application discloses an acid-resistant non-noble metal catalyst and a preparation method and application thereof, and particularly relates to the field of acid-resistant metal catalysts, and the preparation method of the acid-resistant non-noble metal catalyst comprises the following steps: step 1, preparation of a carrier; step 2, modification of the carrier; step 3, preparation of an impregnation solution; step 4, preparation of an unactivated catalyst; step 5, activation of the catalyst; and step 6, functionalization of the catalyst. The acid-resistant non-noble metal catalyst prepared by the application can be applied to the synthesis of p-aminophenol from nitrobenzene. The catalyst has good acid resistance and stability, and when applied to the process of preparing p-aminophenol by rearrangement of nitrobenzene hydrogenation, the catalyst has high activity and high selectivity of p-aminophenol under relatively mild reaction conditions, the production conditions are improved, the production cost is reduced, and the product quality is improved.

The invention belongs to the technical field of electrolytic synthesis, and particularly relates to a method for synthesizing p-aminophenol and persulfate. According to the application, a cathode electrocatalytic reduction synthesis process of p-aminophenol and an anode electrocatalytic oxidation synthesis process of persulfate are innovatively coupled, and the cathode current efficiency in the preparation process of p-aminophenol is effectively improved by regulating and controlling anode electrocatalytic temperature parameters. Performance test results show that the cathode current efficiency can reach 81.3%-89.82%, and compared with the cathode current efficiency of 80% or below in a conventional p-aminophenol preparation process, the technical breakthrough exceeding the expectation is achieved, and the unexpected technical effect is shown.

The invention relates to the technical field of laboratory waste treatment, in particular to a method for preparing alumina-based magnesium aluminate spinel by recycling laboratory waste. The waste recycling device is used for solving the problems of environmental pollution and resource waste caused by waste materials generated in existing laboratories. The method comprises the following steps of: settling and drying the waste material, grinding the waste material, high bauxite, biphenyl aminophenol aldehyde epoxy resin and niobium pentoxide, and calcining to form alumina-based magnesium aluminate spinel; the preparation method comprises the following steps: carrying out nucleophilic substitution reaction on 4, 4 '-biphenyl dimethyl dimethyl ether and 4-aminophenol to prepare an intermediate product 1, and carrying out nucleophilic ring opening and polymerization reaction on the intermediate product 1 and epoxy chloropropane to generate the biphenyl aminophenol aldehyde epoxy resin. According to the method, environmental pollution caused by direct discharge of waste materials is avoided, the production cost is reduced, cyclic utilization of resources is realized, ecological damage caused by raw material exploitation can be reduced, and the method has a remarkable environmental protection effect.

The invention discloses 2-((4-aminopyridine-2-yl) amino)-4-methylphenol as well as a synthesis method and application thereof, 2-bromo-4-methylphenol and 4-nitropyridine-2-amine are taken as raw materials, and an intermediate 4-methyl-2-((4-nitropyridine-2-yl) amino) phenol is obtained through condensation reaction; and reducing the intermediate under the action of ammonium formate and a catalyst to obtain the 2-((4-aminopyridine-2-yl) amino)-4-methylphenol. The method is simple and convenient to operate, mild in operation condition and high in reaction rate, the obtained product is high in purity and yield, the dispersity and antistatic performance of the insoluble sulfur can be improved, and the method is suitable for industrial mass production.

The invention discloses a production method of a high-temperature-resistant lithium battery base membrane. The lithium battery base membrane is prepared from PA6, PA10T / 66, magnesium hydroxide, glass fibers, zinc borate, an antioxidant, silane coupling agent modified silicon dioxide and a DOPO-triglycidyl p-aminophenol reaction product. The high-temperature-resistant lithium battery base membrane designed by the invention not only has excellent high-temperature resistance, but also has good mechanical properties.

The invention provides an olefin polymerization catalyst carrier as well as a preparation method and application thereof. The olefin polymerization catalyst carrier comprises a composition shown in a formula (I), and in the formula (I), R1 is selected from C1-C14 alkyl groups or C3-C14 cycloalkyl groups; r2 and R3 are the same or different, and are respectively and independently selected from H, C1-C5 alkyl or C1-C5 halogenated alkyl; x is selected from halogen; m is 0.1-1.9, n is 0.1-1.9, and m + n = 2; c1 is selected from aminophenol compounds, 0 lt; q < = 0.5. The carrier is good in morphology, particles are not adhered, the carrier is in a good spherical shape, the particle size of the particles is small, and the particle size distribution is narrow. The catalyst prepared by adopting the carrier to carry out titanium loading has better catalytic activity and ethylene copolymerization capability when being used for olefin polymerization, is sensitive to hydrogen response, and can be used for preparing polymer products with higher bulk density.

In order to increase the total light transmittance while maintaining a high haze value of the thermoplastic liquid crystal polymer, a thermoplastic liquid crystal polymer molded body is produced with a haze value of 99% or more, a coefficient of thermal expansion of 16 to 27 ppm / °C, and a correlation between the absorption coefficient (ε) and the thickness (x) satisfying ε ≤ 0.21x<supgt;‑0.55< / supgt>. The thermoplastic liquid crystal polymer may be a polyester containing repeating units derived from a substance selected from the group consisting of p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid; 6-hydroxy-2-naphthoic acid, terephthalic acid, and p-aminophenol; p-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, and terephthalic acid; 6-hydroxy-2-naphthoic acid, terephthalic acid, p-aminophenol, isophthalic acid, hydroquinone, and naphthalenedicarboxylic acid; and p-hydroxybenzoic acid, terephthalic acid, and 4,4'-dihydroxybiphenyl.