WO2010131421A1 - ポリベンズオキサゾールフィルムの製造方法 - Google Patents
ポリベンズオキサゾールフィルムの製造方法 Download PDFInfo
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- WO2010131421A1 WO2010131421A1 PCT/JP2010/002788 JP2010002788W WO2010131421A1 WO 2010131421 A1 WO2010131421 A1 WO 2010131421A1 JP 2010002788 W JP2010002788 W JP 2010002788W WO 2010131421 A1 WO2010131421 A1 WO 2010131421A1
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- polyamide
- polybenzoxazole
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- 0 C*c1c(*)cc(*)c([*+])c1 Chemical compound C*c1c(*)cc(*)c([*+])c1 0.000 description 2
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/22—Polybenzoxazoles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
- C08K3/041—Carbon nanotubes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
- C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
Definitions
- the present invention relates to a substituted polyamide which is a precursor of polybenzoxazole and a method for producing the same.
- the present invention also relates to a method for producing a polybenzoxazole film using such a substituted polyamide.
- the present invention relates to a polybenzoxazole in which carbon nanotubes are uniformly dispersed and a method for producing the film.
- Polybenzoxazole films are expected to have high strength, high elastic modulus, high heat resistance, and dimensional stability due to their chemical structure, and various production methods have been proposed so far.
- Patent Document 1 a casting method (Patent Document 1) and a biaxial stretching method using a blow molding method (Patent Document 2) have been proposed.
- a film is produced from an optically anisotropic solution in which polybenzoxazole having a rigid molecular structure is dissolved at a high concentration. Therefore, the obtained film has a mechanical property depending on the properties of this solution. Strong anisotropy.
- films thus produced directly from polybenzoxazole solutions have mechanical properties in the machine direction (direction in which the solution is extruded and stretched) and in the transverse direction (perpendicular to the machine direction). There was a problem that the balance, particularly the balance of strength, was inferior.
- Patent Document 3 proposes a method for producing a precursor of polybenzoxazole, and the precursor obtained by this method is easily dissolved in an organic solvent and formed into an arbitrary shape from this solution. It is described that a polybenzoxazole having a desired shape can be obtained by ring-closing with heating, for example, a film-like polybenzoxazole can also be produced.
- polybenzoxazole since polybenzoxazole has high strength, high elastic modulus, and high heat resistance, it has been widely developed in various fields such as a magnetic recording film and a protective film on the structure surface. However, polybenzoxazole is inferior in light resistance, and has the disadvantage that the strength decreases when exposed to sunlight for a long time.
- Patent Document 4 proposes that a polybenzoxazole film contains carbon nanotubes.
- carbon nanotubes are added to a polymerization system when polybenzoxazole is directly polymerized from 4,6-diaminoresorcinol and terephthalic acid in polyphosphoric acid, and the obtained polymer dope is directly produced.
- a polybenzoxazole film containing carbon nanotubes was produced, and it was confirmed that this film had light resistance.
- the present invention was created in view of the current state of the prior art, and its object is to provide a polymer having excellent solubility in organic solvents and balanced mechanical properties (particularly strength) in the vertical and horizontal directions.
- An object of the present invention is to provide a precursor of polybenzoxazole, a method for producing the same, and a method for producing a polybenzoxazole film from the precursor, which can easily produce a benzoxazole film.
- Another object of the present invention is to provide a polybenzoxazole in which carbon nanotubes are uniformly dispersed and a method for producing the film.
- the present inventor has determined that at least a portion of the hydroxy groups in the polyamide obtained by reacting a silylated product of 4,6-diaminoresorcinol with terephthalic acid chloride is tert.
- -Polyamide obtained by butoxycarbonyl substitution has sufficient solubility for cast film formation, and when this substituted polyamide is used, a polybenzoxazole film having a balance of mechanical properties in the longitudinal and transverse directions is produced. I found that I can do it.
- the present inventor does not directly polymerize polybenzoxazole and add a carbon nanotube to the polymerization system at that time, but first synthesizes a polybenzoxazole precursor polyamide and produces a substituted polyamide from the polyamide.
- the present inventors have found that carbon nanotubes can be uniformly dispersed in polybenzoxazole by adding and dispersing carbon nanotubes in this substituted polyamide and then heating and ring-closing to convert the substituted polyamide into polybenzoxazole.
- the present invention has been completed based on these findings.
- a substituted polyamide which is a precursor of polybenzoxazole, wherein the polyamide has a hydroxy group in the ortho position with respect to the amide group, and at least a part of the hydroxy group is tert-butoxy.
- a substituted polyamide characterized in that it is substituted with a carbonyl group.
- the manufacturing method of the above-mentioned substituted polyamide characterized by including the following processes is provided: (I) reacting silylated 4,6-diaminoresorcinol with terephthalic acid chloride to synthesize a polyamide having a hydroxy group in the ortho position relative to the amide group; and (ii) at least one of the synthesized polyamides A step of substituting a part of hydroxy groups with a tert-butoxycarbonyl group to obtain a substituted polyamide.
- the present invention also provides a method for producing a polybenzoxazole film characterized by including the following steps: (I) a step of obtaining a polyamide film by casting a solution obtained by dissolving the above substituted polyamide in an organic solvent; and (ii) a step of heating the polyamide film to cyclize to obtain a polybenzoxazole film.
- a method for producing polybenzoxazole in which carbon nanotubes are uniformly dispersed including the following steps: (I) adding carbon nanotubes to a solution of the above substituted polyamide in an organic solvent and dispersing the carbon nanotubes to prepare a dispersion; and (ii) heating the dispersion to close the ring, A step of obtaining polybenzoxazole in which is uniformly dispersed.
- a method for producing a polybenzoxazole film in which carbon nanotubes are uniformly dispersed including the following steps: (I) adding carbon nanotubes to a solution of the above substituted polyamide in an organic solvent and dispersing the carbon nanotubes to prepare a dispersion; (Ii) a step of obtaining a polyamide film in which the carbon nanotubes are uniformly dispersed by casting the dispersion; and (iii) heating the polyamide film to close the ring to obtain a polybenzoxazole film in which the carbon nanotubes are uniformly dispersed. Obtaining step.
- the substituted polyamide which is a precursor of the polybenzoxazole of the present invention has high solubility in an organic solvent because at least a part of its hydroxy group is substituted with a tert-butoxycarbonyl group. If cast film formation is performed, a polybenzoxazole film having a good balance of mechanical properties (particularly strength) in the vertical and horizontal directions of the film can be easily obtained. Further, according to the production method of the present invention, since carbon nanotubes are added at the stage of substituted polyamide which is a precursor of polybenzoxazole, polybenzoxazole in which carbon nanotubes are uniformly dispersed and a film thereof can be easily obtained. it can.
- Example 2 shows an infrared absorption spectrum of N, N ′, O, O′-tetra (trimethylsilyl) -4,6-diaminoresorcinol produced in Reference Example.
- 1 shows the 1 H-NMR spectrum of N, N ′, O, O′-tetra (trimethylsilyl) -4,6-diaminoresorcinol produced in Reference Example.
- the infrared absorption spectrum of the polyamide manufactured in Example 1 is shown.
- 2 shows an infrared absorption spectrum of a tert-butoxycarbonyl-substituted polyamide produced in Example 1.
- 1 shows the 1 H-NMR spectrum of the tert-butoxycarbonyl-substituted polyamide produced in Example 1.
- the infrared absorption spectrum of the polybenzoxazole film manufactured in Example 3 is shown.
- the TGA chart of the solution for casting used in Example 3 is shown.
- the infrared absorption spectrum of the polybenzoxazole film manufactured in Example 4 is shown.
- the TGA chart of the solution for casting used in Example 4 is shown.
- the visible-near infrared absorption spectrum of the casting solution used in Example 4 is shown.
- 2 shows a visible-near infrared fluorescence two-dimensional spectrum of a casting solution used in Example 4.
- the substituted polyamide of the present invention is a precursor of polybenzoxazole, wherein the polyamide has a hydroxy group in the ortho position with respect to the amide group, and at least a part of the hydroxy group is substituted with a tert-butoxycarbonyl group. It is characterized by being. Since the substituted polyamide of the present invention has at least part of its hydroxy group substituted with a tert-butoxycarbonyl group, it can be used for general-purpose organic solvents such as dimethylformamide, N-methyl-2-pyrrolidone and N, N-dimethylacetamide. It has high solubility and can be easily cast into a film by dissolving in these organic solvents.
- the tert-butoxycarbonyl group corresponds to a protective group, but in the present invention, it is important that the protective group is a tert-butoxycarbonyl group.
- Protecting groups other than the tert-butoxycarbonyl group such as a methyl group, an ethyl group, a phenyl group, and a benzyl group, may be used under basic conditions in which sodium hydroxide or the like is present when these groups are replaced with a hydroxyl group of polyamide. In this case, since the solubility of the polyamide is low and hydrolysis at the amide group site occurs, it is not easy to perform the substitution reaction.
- the reaction of the deprotecting group must be carried out in the presence of palladium carbon or a strong acid. It is not suitable for the method of the present invention for carrying out the ring closure reaction to oxazole.
- the protecting group is a tert-butoxycarbonyl group, the substitution of the polyamide with a hydroxyl group is easy, and the tert-butoxycarbonyl group is removed relatively easily during the ring-closing reaction from polyamide to polybenzoxazole. Progresses sufficiently.
- the substituted polyamide of the present invention is produced by a production method including the following steps: (I) reacting silylated 4,6-diaminoresorcinol with terephthalic acid chloride to synthesize a polyamide having a hydroxy group in the ortho position relative to the amide group; and (ii) at least one of the synthesized polyamides A step of substituting a part of hydroxy groups with a tert-butoxycarbonyl group to obtain a substituted polyamide.
- Silylated 4,6-diaminoresorcinol used in step (i) can be obtained, for example, by reacting commercially available 4,6-diaminoresorcinol dihydrochloride with a silylating agent in an organic solvent. (See Equation 1 below). After completion of the reaction of Formula 1, vacuum distillation is performed to isolate the desired silylated product.
- silylating agent in the reaction of Formula 1 a general silylating agent can be used, and specifically, hexamethyldisilazane, chlorotrimethylsilane, or a mixture thereof can be used.
- organic solvent aromatic solvents such as benzene, toluene, xylene and anisole, and those obtained by dehydration treatment of tetrahydrofuran, carbon tetrachloride and the like can be used.
- the reaction temperature is usually 80 to 130 ° C.
- the reaction time is usually 1 hour to 100 hours. When the time is less than 1 hour, the amount of unreacted substances may increase. When the time is longer than 100 hours, the product may be decomposed to reduce the yield.
- the terephthalic acid chloride used in step (i) can be obtained, for example, by reacting terephthalic acid with thionyl chloride (see Formula 2 below).
- a commercial item may be used for the terephthalic acid chloride of a process (i).
- a commercial item may be used for the terephthalic acid chloride of a process (i).
- an organic solvent As this organic solvent, hexane, cyclohexane, cyclohexanone, or the like can be used.
- step (i) a silylated 4,6-diaminoresorcinol prepared as described above and terephthalic acid chloride are reacted to synthesize a polyamide having a hydroxy group in the ortho position relative to the amide group (the following formula 3).
- this step can be carried out by preparing an exact equimolar amount of silylated 4,6-diaminoresorcinol and terephthalic acid chloride and reacting them in an organic solvent at a low temperature.
- dimethylformamide, N-methyl-2-pyrrolidone, N, N-dimethylacetamide, pyridine, tetrahydrofuran, 1,4-dioxane, carbon tetrachloride, chloroform, tetrachloroethane and the like are dehydrated.
- the reaction temperature varies depending on the kind of organic solvent to be used, it is generally 60 to -10 ° C, preferably 20 to -10 ° C.
- the reaction time is usually 1 hour to 24 hours, preferably 1 hour to 12 hours.
- reaction solution is dropped into a large amount of alcohol to precipitate a polyamide, which is filtered as a solid and washed with alcohol.
- alcohol methanol, ethanol, propanol, butanol and the like can be used.
- step (ii) Since the silyl group is eliminated during the reaction in the step (i) or during the post-reaction treatment, the polyamide synthesized in the step (i) has almost no solubility in an organic solvent. Therefore, it cannot be cast into a film by dissolving it in an organic solvent. Therefore, in order to increase the solubility in a general organic solvent, in step (ii), at least some of the hydroxy groups in the polyamide synthesized in step (i) are tert-butoxycarbonyl groups (also referred to as t-Boc groups). To obtain a substituted polyamide (see Formula 4 below). Specifically, this step can be performed by reacting the polyamide synthesized in step (i) with di-tert-butyl dicarbonate in an organic solvent in the presence of a basic substance.
- organic solvent in the reaction of Formula 4 dimethylformamide, N-methyl-2-pyrrolidone, N, N-dimethylacetamide, pyridine, tetrahydrofuran, 1,4-dioxane, toluene, benzene, pyridine, anisole, etc. should be used.
- Can do As the basic substance, sodium carbonate, potassium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, triethylamine, trimethylamine, ammonia and the like can be used.
- the reaction temperature is usually 0 to 50 ° C., preferably 0 to 35 ° C.
- the reaction time is usually 0.5 hours to 50 hours, preferably 0.5 hours to 30 hours.
- reaction solution is dropped into water or alcohol to precipitate a substituted polyamide, filtered as a solid, washed well with water or alcohol, and the substituted polyamide is purified.
- this alcohol methanol, ethanol, propanol, butanol and the like can be used.
- the polybenzoxazole film of the present invention can be produced from the substituted polyamide of the present invention obtained by the above production method by a production method including the following steps: (I) a step of obtaining a polyamide film by casting a solution obtained by dissolving the substituted polyamide of the present invention in an organic solvent; and (ii) a step of heating the polyamide film to cyclize to obtain a polybenzoxazole film.
- organic solvent in step (i) general-purpose organic solvents such as dimethylformamide, N-methyl-2-pyrrolidone, N, N-dimethylacetamide and the like can be used.
- concentration of the substituted polyamide in the solution is not particularly limited as long as it is suitable for casting, and is usually 1 mg / ml to 50 mg / ml, preferably 1 mg / ml to 30 mg / ml.
- the solution used for casting can be prepared by dissolving the purified substituted polyamide of the present invention in an organic solvent, but the purification treatment is not performed after tert-butoxycarbonyl substitution in the method for producing the substituted polyamide of the present invention.
- the reaction solution after the substitution reaction can be used as it is or after diluting to a necessary concentration by adding an organic solvent as necessary.
- the organic solvent used in the substitution reaction becomes the solvent of the solution used for casting as it is, it is preferable to use dimethylformamide or N-methyl-2-pyrrolidone as the organic solvent.
- step (i) the solution thus prepared is cast to obtain a polyamide film.
- This step can be performed by any conventionally known method.
- the solution is cast on a substrate made of a material such as glass, fluororesin, aluminum, iron, or stainless steel, a sheet, a film, etc.
- a method of removing the organic solvent by heating under reduced pressure and a method of extruding the solution from a die and taking it up on a roll or an endless belt can be exemplified.
- step (ii) the polyamide film thus obtained is heated and closed in step (ii) to obtain a polybenzoxazole film (see the following formula 5).
- the heat treatment is preferably performed at 170 to 400 ° C., more preferably 200 to 400 ° C. If the heat treatment temperature is higher than the upper limit, side reactions may occur, and mechanical properties and the like may be reduced. On the other hand, when the heat treatment temperature is lower than the lower limit, the ring closure reaction becomes extremely slow, and the target polybenzoxazole film may not be obtained.
- the heat treatment time is usually 1 minute to 180 minutes, preferably 10 minutes to 150 minutes. Note that the heat treatment is preferably performed in an inert gas atmosphere because there is little decrease in mechanical properties due to side reactions.
- the polybenzoxazole film of the present invention produced as described above has a good balance of mechanical properties (particularly strength) in the longitudinal and lateral directions of the film, and has a high resistance to tearing from all directions. Therefore, the polybenzoxazole film of the present invention is a film for magnetic recording, an electronic circuit board, a substrate for mounting electronic components, a composite material reinforcing material, a structural surface protective film, a flame retardant heat resistant wire coating material for spacecraft and aircraft. They can be widely used as window materials for high-temperature containers, optical control materials, and the like.
- the method for producing polybenzoxazole in which the carbon nanotubes of the present invention are uniformly dispersed includes the following steps (i) to (ii): (I) adding carbon nanotubes to a solution of the above substituted polyamide in an organic solvent and dispersing the carbon nanotubes to prepare a dispersion; and (ii) heating the dispersion to close the ring, A step of obtaining polybenzoxazole in which is uniformly dispersed.
- step (i) carbon nanotubes are added to a solution in which the above substituted polyamide is dissolved in an organic solvent, and the carbon nanotubes are dispersed to prepare a dispersion.
- organic solvent in step (i) general-purpose organic solvents such as dimethylformamide, N-methyl-2-pyrrolidone, N, N-dimethylacetamide and the like can be used.
- concentration of the substituted polyamide in the solution is not particularly limited as long as it is a concentration suitable for subsequent molding, and is usually 1 mg / ml to 50 mg / ml, preferably 1 mg / ml to 30 mg / ml.
- a solution in which the substituted polyamide is dissolved in an organic solvent can be prepared by dissolving the purified substituted polyamide in an organic solvent.
- the purification treatment is not performed after tert-butoxycarbonyl substitution.
- the reaction solution after the substitution reaction can be used as it is or after diluting to a required concentration by adding an organic solvent as necessary. In the latter case, there is an advantage that the process can be omitted and it is economical.
- the organic solvent used in the substitution reaction is directly used as the solvent of the solution in step (i), N, N-dimethylformamide or N-methyl-2-pyrrolidone is used as the organic solvent. It is preferable.
- the amount of carbon nanotube added is preferably 0.01 to 10% by weight, more preferably 0.05 to 1% by weight, based on the polyamide before substitution with a tert-butoxycarbonyl group.
- the carbon nanotubes used here may be single-walled, double-walled, or multi-walled.
- the diameter of the carbon nanotube is preferably from 0.5 to 100 nm, more preferably from 0.7 to 50 nm.
- the length of the carbon nanotube is preferably 0.5 to 200 ⁇ m, and more preferably 0.7 to 150 ⁇ m.
- the dispersion of the carbon nanotubes can be performed, for example, by irradiating the solution with ultrasonic waves. As the ultrasonic irradiation device, either a bus type or a probe type may be used.
- the dispersion prepared in this manner is formed into a desired shape such as a fiber shape if necessary, and then heated and closed in step (ii) to obtain polybenzoxazole in which carbon nanotubes are uniformly dispersed. (See Equation 5 below).
- the heat treatment is preferably performed at 170 to 400 ° C., more preferably 200 to 400 ° C. If the heat treatment temperature is higher than the upper limit, side reactions may occur, and mechanical properties and the like may be reduced. On the other hand, when the heat treatment temperature is lower than the lower limit, the ring closure reaction becomes extremely slow, and the target polybenzoxazole may not be obtained.
- the heat treatment time is usually 1 minute to 180 minutes, preferably 10 minutes to 150 minutes. Note that the heat treatment is preferably performed in an inert gas atmosphere because there is little decrease in mechanical properties due to side reactions.
- polybenzoxazole in which carbon nanotubes are uniformly dispersed can be easily produced.
- the method for producing a polybenzoxazole film in which the carbon nanotubes of the present invention are uniformly dispersed includes the following steps (i) to (iii): (I) adding carbon nanotubes to a solution of the above substituted polyamide in an organic solvent and dispersing the carbon nanotubes to prepare a dispersion; (Ii) a step of obtaining a polyamide film in which the carbon nanotubes are uniformly dispersed by casting the dispersion; and (iii) heating the polyamide film to close the ring to obtain a polybenzoxazole film in which the carbon nanotubes are uniformly dispersed. Obtaining step.
- step (i) is the same as the method for producing the polybenzoxazole of the present invention already described, and therefore description thereof is omitted here.
- step (ii) the dispersion prepared in step (i) is cast to obtain a polyamide film.
- This step can be performed by any conventionally known method.
- the dispersion is cast on a substrate made of a material such as glass, fluororesin, aluminum, iron, or stainless steel, a sheet, a film, and the like. Examples thereof include a method in which the organic solvent is removed by heating under pressure or reduced pressure, and a method in which the dispersion is extruded from a die and taken up on a roll or an endless belt.
- step (iii) the polyamide film thus obtained is heated and closed in step (iii) to obtain a polybenzoxazole film (see Formula 5 below).
- the heat treatment is preferably performed at 170 to 400 ° C., more preferably 200 to 400 ° C. If the heat treatment temperature is higher than the upper limit, side reactions may occur, and mechanical properties and the like may be reduced. On the other hand, when the heat treatment temperature is lower than the lower limit, the ring closure reaction becomes extremely slow, and the target polybenzoxazole film may not be obtained.
- the heat treatment time is usually 1 minute to 180 minutes, preferably 10 minutes to 150 minutes. Note that the heat treatment is preferably performed in an inert gas atmosphere because there is little decrease in mechanical properties due to side reactions.
- the polybenzoxazole and the film thus produced have uniformly dispersed carbon nanotubes, so that the light resistance that has been a drawback of polybenzoxazole is improved, and further, strength, electrical conductivity, heat It is thought that conductivity is also improved. Therefore, the polybenzoxazole obtained by the production method of the present invention and its film are a magnetic recording film, an electronic circuit board, a substrate for mounting electronic components, a composite material reinforcing material, a structural surface protective film, a spacecraft and an aircraft. It can be widely used as a flame retardant heat resistant wire coating material, a window material for a high temperature container, an optical control material, and the like.
- Intrinsic viscosity A solution having a polymer concentration of 0.5 g / dl was prepared using concentrated sulfuric acid as a solvent, and the solution was measured at 30 ° C.
- TGA Using an EXSTAR TG / DTA 6300 manufactured by SII, the thermogravimetric decrease was measured in a nitrogen atmosphere under a temperature rising rate of 10 ° C./min.
- 1 H-NMR The measurement was performed using ADVANCE 300 MHz manufactured by Bulker.
- Infrared absorption spectrum It measured using PROTEGE 460N made from Nicolet.
- Visible-Near Infrared (vis-NIR) absorption spectrum Measured using V-570 manufactured by JASCO.
- reaction solution was dropped into 1000 ml of methanol, and the precipitate was collected by filtration and washed with 100 ml of methanol.
- the inherent viscosity ⁇ inc of the precipitate was 1.21 dL / g.
- the structure was identified by the infrared absorption spectrum (FIG. 3), and the formation of polyamide was confirmed.
- Example 2 Production of tert-butoxycarbonyl-substituted polyamide (2) (I) 4.29 g (10 mmol) of N, N ′, O, O′-tetra (trimethylsilyl) -4,6-diaminoresorcinol prepared in Reference Example and dehydration treatment in a 300 ml three-necked flask under a dry nitrogen atmosphere 20 ml of N-methyl-2-pyrrolidone prepared was added and dissolved at 0 ° C. Purified commercially available terephthalic acid chloride (2.03 g, 10 mmol) was added little by little and reacted at 0 ° C. for 6 hours.
- Example 3 Production of polybenzoxazole film (i) A casting solution was prepared by dissolving 0.5 g of the tert-butoxycarbonyl-substituted polyamide produced in Example 2 in 100 ml of N-methyl-2-pyrrolidone. Cast on an aluminum plate. Then, the solvent was distilled off under an environment of 3 mmHg for 24 hours at room temperature and then 3 mmHg for 1 hour each at 100 ° C., 200 ° C. and 300 ° C. to obtain a polyamide film.
- this polyamide film was heated together with the plate at 360 ° C. for 30 minutes under a nitrogen stream to convert the polyamide into polybenzoxazole, thereby obtaining a polybenzoxazole film.
- the infrared absorption spectrum of the obtained film is shown in FIG. FIG. 7 shows a TGA chart when the casting solution used in (i) is heated to 700 ° C.
- Example 4 (1) Preparation of Dispersion Production of tert-butoxycarbonyl-substituted polyamide 0.5 g of tert-butoxycarbonyl-substituted polyamide produced in (2) was dissolved in 100 ml of N-methyl-2-pyrrolidone. To this solution, 1 mg of Hipym SWCNT made by Unidym was added as a carbon nanotube, and the carbon nanotube was dispersed by irradiating ultrasonic waves for 10 hours while maintaining the bath temperature at 30 to 35 ° C. using BRANSON 5510 (47 kHz, 100 W) made by Yamato. I let you. Thereafter, centrifugation was performed at 10,000 g for 1 hour, and the supernatant was used as a dispersion.
- BRANSON 5510 47 kHz, 100 W
- FIG. 9 shows a TGA chart when the tert-butoxycarbonyl-substituted polyamide film produced in (i) is heated to 700 ° C. Further, the visible-near infrared absorption spectrum and the visible-near infrared fluorescence two-dimensional spectrum of the casting solution are shown in FIGS. 10 and 11, respectively.
- FIG. 10 shows a TGA chart when the tert-butoxycarbonyl-substituted polyamide film produced in (i) is heated to 700 ° C.
- FIG. 10 shows van Hobe absorption based on the presence of carbon nanotubes as one molecule
- FIG. 11 shows a spot-like visible-near infrared fluorescence spectrum based on the presence of carbon nanotubes as one molecule. It can be seen. From these results, it can be seen that in the obtained polybenzoxazole film, the carbon nanotubes are unbundled and uniformly dispersed one by one. Furthermore, when the light resistance, strength, electrical conductivity, and thermal conductivity of the obtained polybenzoxazole film were examined, all were sufficiently high.
- a polybenzoxazole film having a good balance of mechanical properties (particularly strength) in the longitudinal direction and the transverse direction can be easily produced.
- Such polybenzoxazole films can be widely used in various fields including magnetic recording films.
- carbon nanotubes are added at the stage of substituted polyamide which is a precursor of polybenzoxazole, polybenzoxazole in which carbon nanotubes are uniformly dispersed and a film thereof can be easily obtained. it can. Since such polybenzoxazole and its film are uniformly dispersed with carbon nanotubes, it has excellent light resistance, strength, electrical conductivity, and thermal conductivity, and is widely used in various fields including magnetic recording films. be able to.
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Abstract
Description
(i)シリル化4,6-ジアミノレゾルシノールとテレフタル酸クロライドとを反応させ、アミド基に対してオルト位にヒドロキシ基を有するポリアミドを合成する工程;および
(ii)合成されたポリアミド中の少なくとも一部のヒドロキシ基をtert-ブトキシカルボニル基で置換し、置換ポリアミドを得る工程。
(i)上述の置換ポリアミドを有機溶媒に溶解した溶液をキャストしてポリアミドフィルムを得る工程;および
(ii)このポリアミドフィルムを加熱して閉環し、ポリベンズオキサゾールフィルムを得る工程。
(i)上述の置換ポリアミドを有機溶媒に溶解した溶液にカーボンナノチューブを添加し、カーボンナノチューブを分散させて分散液を調製する工程;および
(ii)この分散液を加熱して閉環し、カーボンナノチューブを均一に分散したポリベンズオキサゾールを得る工程。
(i)上述の置換ポリアミドを有機溶媒に溶解した溶液にカーボンナノチューブを添加し、カーボンナノチューブを分散させて分散液を調製する工程;
(ii)この分散液をキャストして、カーボンナノチューブを均一に分散したポリアミドフィルムを得る工程;および
(iii)このポリアミドフィルムを加熱して閉環し、カーボンナノチューブを均一に分散したポリベンズオキサゾールフィルムを得る工程。
(i)シリル化4,6-ジアミノレゾルシノールとテレフタル酸クロライドとを反応させ、アミド基に対してオルト位にヒドロキシ基を有するポリアミドを合成する工程;および
(ii)合成されたポリアミド中の少なくとも一部のヒドロキシ基をtert-ブトキシカルボニル基で置換し、置換ポリアミドを得る工程。
(i)本発明の置換ポリアミドを有機溶媒に溶解した溶液をキャストしてポリアミドフィルムを得る工程;および
(ii)このポリアミドフィルムを加熱して閉環し、ポリベンズオキサゾールフィルムを得る工程。
(i)上述の置換ポリアミドを有機溶媒に溶解した溶液にカーボンナノチューブを添加し、カーボンナノチューブを分散させて分散液を調製する工程;および
(ii)この分散液を加熱して閉環し、カーボンナノチューブを均一に分散したポリベンズオキサゾールを得る工程。
(i)上述の置換ポリアミドを有機溶媒に溶解した溶液にカーボンナノチューブを添加し、カーボンナノチューブを分散させて分散液を調製する工程;
(ii)この分散液をキャストして、カーボンナノチューブを均一に分散したポリアミドフィルムを得る工程;および
(iii)このポリアミドフィルムを加熱して閉環し、カーボンナノチューブを均一に分散したポリベンズオキサゾールフィルムを得る工程。
濃硫酸を溶媒としてポリマー濃度0.5g/dlの溶液を調製し、30℃で測定した。
(2)TGA
SII製のEXSTAR TG/DTA 6300を用いて、窒素雰囲気で昇温速度10℃/分の条件で熱重量減少を測定した。
(3)1H-NMR
Bulker製のADVANCE 300MHzを用いて測定した。
(4)赤外吸収スペクトル
Nicolet製のPROTEGE 460Nを用いて測定した。
(5)可視-近赤外(vis-NIR)吸収スペクトル
JASCO製のV-570を用いて測定した。
(6)可視-近赤外蛍光スペクトル
HORIBA製のJobin Yvonを用いて励起光波長500~850nm、検出波長900~1400nmで測定した。
(1)N,N’,O,O’-テトラ(トリメチルシリル)-4,6-ジアミノレゾルシノールの製造
系中を乾燥窒素雰囲気下にしたのち、300ml二口フラスコに、4,6-ジアミノレゾルシノール二塩酸塩20.0g(94.0mmol)、脱水処理したトルエン100ml、ヘキサメチルジシラザン100ml(370mmol)、およびクロロトリメチルシラン15ml(120mmol)を入れ、100℃で72時間反応させた。反応終了後、減圧下でトルエン、および過剰のヘキサメチルジシラザンとクロロトリメチルシランを除去し、減圧蒸留により精製した。N,N’,O,O’-テトラ(トリメチルシリル)-4,6-ジアミノレゾルシノールの生成は、赤外吸収スペクトル(図1)、および1H-NMRスペクトル(図2)により確認した。生成物の沸点は、146~149℃/0.9mmHgであり、収量は、43.7g(87%)であった。
tert-ブトキシカルボニル置換ポリアミドの製造(1)
(i)乾燥窒素雰囲気下、300ml三口フラスコ中に、参考例で製造したN,N’,O,O’-テトラ(トリメチルシリル)-4,6-ジアミノレゾルシノール4.29g(10mmol)、および脱水処理したN-メチル-2-ピロリドン20mlを加え、0℃で溶解させた。精製した市販のテレフタル酸クロライド2.03g(10mmol)を少しずつ加え、0℃で6時間反応させた。反応終了後、メタノール1000ml中に反応液を滴下し、沈殿物をろ取し、メタノール100mlで洗浄した。沈殿物の固有粘度ηincは、1.21dL/gであった。赤外吸収スペクトル(図3)により構造を同定し、ポリアミドの生成を確認した。
tert-ブトキシカルボニル置換ポリアミドの製造(2)
(i)乾燥窒素雰囲気下、300ml三口フラスコ中に、参考例で製造したN,N’,O,O’-テトラ(トリメチルシリル)-4,6-ジアミノレゾルシノール4.29g(10mmol)、および脱水処理したN-メチル-2-ピロリドン20mlを加え、0℃で溶解させた。精製した市販のテレフタル酸クロライド2.03g(10mmol)を少しずつ加え、0℃で6時間反応させた。
ポリベンズオキサゾールフィルムの製造
(i)実施例2で製造したtert-ブトキシカルボニル置換ポリアミド0.5gをN-メチル-2-ピロリドン100mlに溶解させてキャスト用溶液を調製し、この溶液を5cm×5cmのアルミニウムプレート上にキャストした。その後、室温で24時間3mmHg、次いで100℃、200℃、300℃の各1時間3mmHgの環境下で溶媒を留去し、ポリアミドフィルムを得た。
(1)分散液の調製
tert-ブトキシカルボニル置換ポリアミドの製造(2)で製造したtert-ブトキシカルボニル置換ポリアミド0.5gをN-メチル-2-ピロリドン100mlに溶解させた。この溶液に、カーボンナノチューブとしてUnidym社製Hipco SWCNT1mgを添加し、Yamato製のBRANSON5510(47kHz,100W)を用いて槽温を30~35℃に保ちながら10時間超音波を照射してカーボンナノチューブを分散させた。その後、10000gで1時間遠心分離を行い、上澄みを分散液として使用した。
(i)(1)で調製した分散液を5cm×5cmのアルミニウムプレート上にキャストした。その後、室温で24時間3mmHg、次いで100℃、200℃、300℃の各1時間3mmHgの環境下で溶媒を留去し、カーボンナノチューブを均一に分散したポリアミドフィルムを得た。
Claims (5)
- ポリベンズオキサゾールの前駆体である置換ポリアミドであって、前記ポリアミドがアミド基に対してオルト位にヒドロキシ基を有し、前記ヒドロキシ基の少なくとも一部がtert-ブトキシカルボニル基で置換されていることを特徴とする置換ポリアミド。
- 以下の工程を含むことを特徴とする請求項1に記載の置換ポリアミドの製造方法:
(i)シリル化4,6-ジアミノレゾルシノールとテレフタル酸クロライドとを反応させ、アミド基に対してオルト位にヒドロキシ基を有するポリアミドを合成する工程;および
(ii)合成されたポリアミド中の少なくとも一部のヒドロキシ基をtert-ブトキシカルボニル基で置換し、置換ポリアミドを得る工程。 - 以下の工程を含むことを特徴とするポリベンズオキサゾールフィルムの製造方法:
(i)請求項1に記載の置換ポリアミドを有機溶媒に溶解した溶液をキャストしてポリアミドフィルムを得る工程;および
(ii)このポリアミドフィルムを加熱して閉環し、ポリベンズオキサゾールフィルムを得る工程。 - 以下の工程を含むことを特徴とする、カーボンナノチューブを均一に分散したポリベンズオキサゾールの製造方法:
(i)請求項1に記載の置換ポリアミドを有機溶媒に溶解した溶液にカーボンナノチューブを添加し、カーボンナノチューブを分散させて分散液を調製する工程;および
(ii)この分散液を加熱して閉環し、カーボンナノチューブを均一に分散したポリベンズオキサゾールを得る工程。 - 以下の工程を含むことを特徴とする、カーボンナノチューブを均一に分散したポリベンズオキサゾールフィルムの製造方法:
(i)請求項1に記載の置換ポリアミドを有機溶媒に溶解した溶液にカーボンナノチューブを添加し、カーボンナノチューブを分散させて分散液を調製する工程;
(ii)この分散液をキャストして、カーボンナノチューブを均一に分散したポリアミドフィルムを得る工程;および
(iii)このポリアミドフィルムを加熱して閉環し、カーボンナノチューブを均一に分散したポリベンズオキサゾールフィルムを得る工程。
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CN102296376A (zh) * | 2011-07-05 | 2011-12-28 | 深圳市中晟创新科技股份有限公司 | 聚对苯撑苯并二噁唑纤维的生产方法 |
CN108587034A (zh) * | 2018-01-26 | 2018-09-28 | 湖州师范学院 | 一种力致比率变色聚合物及其制备方法 |
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CN106478712B (zh) * | 2016-10-11 | 2018-10-26 | 西北工业大学 | 一种环氧端基对苯撑苯并二噁唑前驱体的制备方法 |
CN109354684B (zh) * | 2018-10-23 | 2021-01-05 | 长江师范学院 | 一种合成聚对苯撑苯并双噁唑的工艺 |
CN114790664B (zh) * | 2021-01-26 | 2023-02-24 | 中国科学院化学研究所 | 高强度聚苯撑苯并双噁唑纸基材料 |
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