WO2017135379A1 - 芳香族ポリスルホン、プリプレグ及びプリプレグの製造方法 - Google Patents
芳香族ポリスルホン、プリプレグ及びプリプレグの製造方法 Download PDFInfo
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- WO2017135379A1 WO2017135379A1 PCT/JP2017/003821 JP2017003821W WO2017135379A1 WO 2017135379 A1 WO2017135379 A1 WO 2017135379A1 JP 2017003821 W JP2017003821 W JP 2017003821W WO 2017135379 A1 WO2017135379 A1 WO 2017135379A1
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- aromatic polysulfone
- molecular weight
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- prepreg
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
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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
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/34—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives
- C08G65/38—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives derived from phenols
- C08G65/40—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives derived from phenols from phenols (I) and other compounds (II), e.g. OH-Ar-OH + X-Ar-X, where X is halogen atom, i.e. leaving group
Definitions
- the present invention relates to an aromatic polysulfone, a prepreg, and a method for producing a prepreg.
- Aromatic polysulfone is not only excellent in heat resistance, chemical resistance, creep resistance, etc., but also has good adhesion to materials such as metal, glass, ceramic, etc., and is therefore used as various coating materials.
- a method of forming a fluororesin coating film on the surface of a substrate by applying an aromatic polysulfone solution containing a fluororesin to a metal substrate and then performing heat treatment is known. ing.
- the aromatic polysulfone In order for the aromatic polysulfone to have heat resistance suitable for such use, it is important that its molecular weight and molecular weight distribution are in an appropriate range.
- the number average molecular weight (Mn) is 11,000 to 25000
- An aromatic polysulfone having a polydispersity (Mw / Mn) of 3.0 or less is known (see Patent Document 1).
- Aromatic polysulfone has a high glass transition temperature (Tg) and is therefore used in many fields including the electronic materials field as a material having excellent heat resistance. However, these aromatic polysulfones are desired to have further improved heat resistance, and there is still room for improvement in order to develop a high glass transition temperature (Tg).
- Tg glass transition temperature
- the components of the electronic device may be exposed to high temperatures as in a reflow process, for example. In order to suppress the deformation of parts, it is required to develop a high glass transition temperature (Tg). Moreover, the same problem may arise about the member exposed not only to an electronic device but to high temperature conditions.
- the present invention has been made in view of such circumstances, and provides a novel aromatic polysulfone that can exhibit a high glass transition temperature (Tg), a prepreg using the aromatic polysulfone, and a method for producing the prepreg. This is the issue.
- a first aspect of the present invention is a polymerization of a dihalogeno compound (A) represented by the formula (A) and a dihydric phenol (B) represented by the formula (B).
- a thermoplastic aromatic polysulfone obtained by the process, wherein the ratio of the number average molecular weight (Mn) to the weight average molecular weight (Mw) (Mw / Mn) is 1.80 or more and less than 1.90, and the number average molecular weight An aromatic polysulfone having (Mn) of 6000 or more and less than 14,000 is provided.
- X and X ′ each independently represent a halogen atom.
- R 1 , R 2 , R 3 and R 4 each independently represent an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.
- n 1 , n 2 , n 3 and n 4 each independently represents an integer of 0 to 4.
- n 1, n 2, n 3 or n 4 is an integer of 2 to 4
- a plurality of R 1, R 2, R 3 or R 4 may each also being the same or different.
- the second aspect of the present invention is a prepreg using the aromatic polysulfone of the first aspect of the present invention, a liquid epoxy resin, a curing agent, and reinforcing fibers.
- a third aspect of the present invention is a method for producing a prepreg, comprising a step of impregnating a reinforcing fiber into a mixture obtained by mixing the aromatic polysulfone according to the first aspect of the present invention, a liquid epoxy resin, and a curing agent. Is the method.
- thermoplastic aromatic polysulfone obtained by polymerizing a dihalogeno compound (A) represented by the formula (A) and a dihydric phenol (B) represented by the formula (B), Mw / Mn which is the value of the ratio of Mn which is the number average molecular weight and Mw which is the weight average molecular weight is 1.80 or more and less than 1.90, and Mn which is the number average molecular weight is 6000 or more and less than 14,000, Aromatic polysulfone.
- X and X ′ each independently represent a halogen atom
- R 1 , R 2 , R 3 and R 4 each independently represent an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms
- n 1 , n 2 , n 3 and n 4 each independently represent an integer of 0 to 4
- n 1 , n 2 , n 3 or n 4 is an integer of 2 to 4
- a plurality of R 1 , R 2 , R 3 or R 4 may be the same as or different from each other.
- the present invention it is possible to provide a novel aromatic polysulfone that can exhibit a high glass transition temperature (Tg), a prepreg using the aromatic polysulfone, and a method for producing the prepreg.
- Tg glass transition temperature
- the aromatic polysulfone of the present invention is a thermoplastic obtained by polymerizing a dihalogeno compound (A) represented by the following formula (A) and a dihydric phenol (B) represented by the following formula (B).
- Aromatic polysulfone having a ratio of number average molecular weight (Mn) to weight average molecular weight (Mw) (Mw / Mn, that is, polydispersity) of 1.80 or more and less than 1.90, and number average molecular weight (Mn) is an aromatic polysulfone having a molecular weight of 6000 or more and less than 14,000.
- a dihalogeno compound (A) represented by the following formula (A) and a dihydric phenol (B) represented by the following formula (B) are polymerized.
- the Mw / Mn which is the value of the ratio between the number average molecular weight Mn and the weight average molecular weight Mw, is 1.80 or more and less than 1.90, and the number average molecular weight Mn is 6000 or more and less than 14,000. It is a thermoplastic aromatic polysulfone.
- Still another aspect of the aromatic polysulfone of the present invention is derived from a structural unit derived from a dihalogeno compound (A) represented by the following formula (A) and a dihydric phenol (B) represented by the following formula (B).
- A dihalogeno compound
- B dihydric phenol
- Mw / Mn which is a value of the ratio of Mn which is a number average molecular weight and Mw which is a weight average molecular weight is 1.80 or more and less than 1.90
- Mn which is a number average molecular weight is It is a thermoplastic aromatic polysulfone having a molecular weight of 6000 or more and less than 14,000.
- derived means that the chemical structure changes because the dihalogeno compound (A) and the dihydric phenol (B) are polymerized.
- the dihalogeno compound (A) represented by the formula (A) may be simply referred to as “dihalogeno compound (A)”.
- the dihydric phenol (B) represented by the formula (B) may be simply referred to as “dihydric phenol (B)”.
- the aromatic polysulfone of the present invention has a dihalogeno compound (A) and a dihydric phenol (B) as monomers, and Mw / Mn and Mn satisfy the above conditions, so that a high glass transition temperature can be expressed, and is excellent. Heat resistance.
- X and X ′ each independently represent a halogen atom
- R 1 , R 2 , R 3 and R 4 each independently represent an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms
- n 1 , n 2 , n 3 and n 4 each independently represent an integer of 0 to 4; when n 1 , n 2 , n 3 or n 4 is an integer of 2 to 4, a plurality of R 1 , R 2 , R 3 or R 4 may be the same as or different from each other.
- the dihalogeno compound (A) is a compound represented by the formula (A).
- X and X ′ each independently represent a halogen atom.
- the halogen atom include a chlorine atom, a bromine atom, and an iodine atom, and a chlorine atom is preferable.
- X and X ′ are any of 2-position, 3-position and 4-position of the benzene ring skeleton, where the position number of the carbon atom to which the sulfonyl group (—SO 2 —) of the benzene ring skeleton is bonded is the 1-position.
- the dihalogeno compound (A) is preferably bis (4-chlorophenyl) sulfone to which one or both of R 3 and R 4 may be bonded in place of a hydrogen atom.
- R 3 and R 4 each independently represent an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.
- the alkyl group in R 3 and R 4 may be linear, branched or cyclic, but is preferably linear or branched. Examples thereof include a methyl group and an ethyl group. , N-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, and tert-butyl group.
- the alkoxy group in R 3 and R 4 may be linear, branched or cyclic, but is preferably linear or branched. Examples thereof include a methoxy group and an ethoxy group. N-propoxy group, isopropoxy group, n-butoxy group, isobutoxy group, sec-butoxy group, and tert-butoxy group.
- n 3 is the number of bonds of R 3
- n 4 is the number of bonds of R 4
- the corresponding bonding position of R 3 or R 4 is not particularly limited.
- R 3 or R 4 is any of the 2nd, 3rd, 4th, 5th and 6th positions of the benzene ring skeleton. It may be bonded to any carbon atom.
- R 3 or R 4 is preferably bonded to a carbon atom other than the 4-position, and more preferably bonded to a carbon atom at the 3-position or 5-position, or the 3-position and 5-position.
- n 3 or n 4 is an integer of 2 to 4
- a plurality of R 3 or R 4 may be the same as or different from each other.
- n 3 is an integer of 2 to 4
- all n 3 R 3 s may be the same or different, and when n 3 is 3 or 4, Only a part may be the same.
- the number of n 4 R 4 is the same as that of n 3 R 3 .
- n 3 and n 4 are preferably each independently an integer of 0 to 3, more preferably an integer of 0 to 2, and even more preferably 0 or 1.
- An example of a preferred dihalogeno compound (A) is bis (4-chlorophenyl) sulfone.
- Bis (4-chlorophenyl) sulfone is also referred to as 4,4'-dichlorodiphenylsulfone.
- the dihydric phenol (B) is a compound represented by the formula (B).
- the two hydroxy groups (—OH) each represent the 2-position of the benzene ring skeleton, when the position number of the carbon atom to which the sulfonyl group of the benzene ring skeleton is bonded is the 1-position.
- the dihydric phenol (B) is preferably bis (4-hydroxyphenyl) sulfone to which one or both of R 1 and R 2 may be bonded in place of a hydrogen atom.
- Bis (4-hydroxyphenyl) sulfone is also referred to as 4,4′-dihydroxydiphenylsulfone.
- R 1 and R 2 each independently represent an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.
- Examples of the alkyl group having 1 to 4 carbon atoms and the alkoxy group having 1 to 4 carbon atoms in R 1 and R 2 include the same groups as those described in the description of R 3 and R 4 .
- N 1 is the number of bonds of R 1
- n 2 is the number of bonds of R 2
- the bonding position of the corresponding R 1 or R 2 is not particularly limited.
- R 1 or R 2 is any of the 2nd, 3rd, 4th, 5th and 6th positions of the benzene ring skeleton. It may be bonded to a carbon atom. However, as a bonding position of R 1 or R 2 , a carbon atom to which a hydroxy group is bonded is excluded. R 1 or R 2 is preferably bonded to a carbon atom other than the 4-position, and preferably bonded to the 3-position or 5-position, or the 3-position and 5-position carbon atoms.
- n 1 or n 2 is an integer of 2 to 4
- a plurality of R 1 or R 2 may be the same as or different from each other.
- n 1 is an integer of 2 to 4
- all n 1 R 1 s may be the same or different
- R 1 may be partially identical.
- the n 2 R 2 is the same as the case of n 1 R 1 .
- n 1 and n 2 are preferably each independently an integer of 0 to 3, more preferably an integer of 0 to 2, and even more preferably 0 or 1.
- the dihydric phenol (B) is preferably bis (4-hydroxyphenyl) sulfone or bis (4-hydroxy-3,5-dimethylphenyl) sulfone.
- the reduced viscosity of the aromatic polysulfone of the present invention is preferably 0.18 dL / g or more, more preferably 0.22 to 0.28 dL / g.
- Aromatic polysulfone tends to improve heat resistance, strength, and rigidity as its reduced viscosity increases.
- the aromatic polysulfone has a reduced viscosity that is too high (that is, if it exceeds the upper limit), the melting temperature or the viscosity tends to be high, and the fluidity tends to be low.
- the reduced viscosity of the aromatic polysulfone of the present invention is within the above range, the heat resistance, strength and rigidity are easily improved, the melting temperature and the melt viscosity are not excessively increased, and the fluidity is hardly decreased.
- the reduced viscosity (dL / g) of aromatic polysulfone indicates a value determined by the following method. First, about 1 g of an aromatic polysulfone resin is precisely weighed and dissolved in N, N-dimethylformamide to make its capacity 1 dL. Subsequently, the viscosity ( ⁇ ) of this solution and the viscosity ( ⁇ 0) of N, N-dimethylformamide as a solvent are measured at 25 ° C. using an Ostwald type viscosity tube. Next, the reduced viscosity of the aromatic polysulfone is determined by dividing the specific viscosity (( ⁇ 0) / ⁇ 0) determined from the measured value by the concentration of the solution (about 1 g / dL).
- the number average molecular weight (Mn) of the aromatic polysulfone of the present invention is 6000 or more, preferably 6500 or more, more preferably 7000 or more, and further preferably 7500 or more.
- Aromatic polysulfone is remarkably excellent in heat resistance because Mn is not less than the lower limit.
- the number average molecular weight (Mn) of the aromatic polysulfone of the present invention is less than 14000, preferably 13500 or less, more preferably 13000 or less, further preferably 12500 or less, still more preferably 12000 or less, and particularly preferably 11500 or less. It is. When Mn is not more than the above upper limit value, the aromatic polysulfone is remarkably excellent in heat resistance.
- the upper limit value and lower limit value of Mn can be arbitrarily combined.
- the number average molecular weight (Mn) of the aromatic polysulfone of the present invention is, for example, 6000 or more and less than 14000, preferably 7000 or more and 13000 or less, more preferably 7500 or more and 12000 or less, further preferably 7500 or more and 11500 or less, and 8000 to 11000. It is particularly preferred that
- the value of Mw / Mn which is the ratio of the weight average molecular weight (Mw) and the number average molecular weight (Mn) of the aromatic polysulfone, indicates the polydispersity of the aromatic polysulfone.
- the value of Mw / Mn is 1.80 or more and less than 1.90, preferably 1.81 or more, more preferably 1.82 or more, preferably 1.89 or less. More preferably, it is 1.88 or less, More preferably, it is 1.87 or less.
- Aromatic polysulfone can express a high glass transition temperature because the value of Mw / Mn is not less than the lower limit.
- the upper limit value and the lower limit value of Mw / Mn can be arbitrarily combined.
- the value of Mw / Mn is particularly preferably from 1.82 to 1.87, for example.
- the weight average molecular weight (Mw) and the number average molecular weight (Mn) of an aromatic polysulfone are values obtained by averaging measured values measured twice by gel permeation chromatography (GPC) analysis, for example. is there.
- the molecular weight in terms of standard polystyrene is obtained based on a calibration curve obtained by measuring the molecular weight of standard polystyrene.
- Mw / Mn can be calculated from the weight average molecular weight (Mw) and the number average molecular weight (Mn) obtained as an average value as described above.
- the aromatic polysulfone of the present invention can exhibit a high glass transition temperature.
- the glass transition temperature (° C.) in the aromatic polysulfone of the present invention is preferably 215 ° C. or higher, more preferably 216 ° C. or higher.
- the glass transition temperature (degreeC) serves as an index for judging the degree of heat resistance of the aromatic polysulfone. Generally, it can be said that the higher the temperature, the more excellent the heat resistance of the aromatic polysulfone.
- polymerization The step of reacting the dihalogeno compound (A) with the dihydric phenol (B) in a solvent (hereinafter referred to as “polymerization”) will be described.
- Polymerization of the dihalogeno compound (A) and the dihydric phenol (B) (hereinafter sometimes referred to as polycondensation) is carried out using an alkali metal carbonate as a base, or in an organic solvent which is a polymerization solvent. It is preferably carried out, more preferably using an alkali metal carbonate of carbonic acid as a base and in an organic solvent.
- the alkali metal carbonate may be an alkali carbonate that is a normal salt, that is, an alkali metal carbonate, or an alkali bicarbonate that is an acidic salt, that is, an alkali bicarbonate or an alkali metal bicarbonate. It may be a mixture of these alkali carbonates and bicarbonates.
- Preferred examples of the alkali carbonate include sodium carbonate and potassium carbonate.
- Preferred examples of the alkali bicarbonate include sodium bicarbonate (also referred to as sodium bicarbonate), potassium bicarbonate (also referred to as potassium bicarbonate), and the like.
- the organic solvent is preferably an organic polar solvent.
- the organic polar solvent include dimethyl sulfoxide, 1-methyl-2-pyrrolidone, sulfolane (also referred to as 1,1-dioxothiolane), 1,3-dimethyl-2-imidazolidinone, 1,3-diethyl-2 -Imidazolidinone, dimethyl sulfone, diethyl sulfone, diisopropyl sulfone, diphenyl sulfone and the like.
- the amount of dihalogeno compound (A) used in the polymerization is preferably 90 to 105 mol%, and preferably 93 to 100 mol%, based on the amount (mole number) of dihydric phenol (B). More preferably, it is 95 to 100 mol%, further preferably 97 to 99 mol%.
- the target reaction (polymerization) is dehydrohalogenated polycondensation of the dihalogeno compound (A) and the dihydric phenol (B). If no side reaction occurs, the molar ratio of both is close to 1: 1.
- the reduced viscosity tends to increase, Mn increases, and Mw / Mn tends to decrease.
- side reactions such as substitution reaction of halogen atoms to hydroxy groups and depolymerization occur due to by-produced alkali hydroxide and the like, and this side reaction reduces the degree of polymerization of the aromatic polysulfone obtained. Therefore, in consideration of the degree of this side reaction, it is necessary to adjust the amount of the dihalogeno compound (A) so that an aromatic polysulfone having a predetermined reduced viscosity, Mn and Mw / Mn can be obtained.
- the amount of alkali metal carbonate used is preferably 90 to 110 mol%, and preferably 95 to 105 mol%, as an alkali metal, relative to the number of moles of the hydroxy group of the dihydric phenol (B). More preferably, it is 95 to 100 mol%, further preferably 97 to 99 mol%. If no side reaction occurs, the greater the amount of alkali metal carbonate used, the faster the target polycondensation will proceed, and the degree of polymerization of the resulting aromatic polysulfone will increase, resulting in the aromatic polysulfone. Tends to increase the reduced viscosity, increase Mn, and decrease Mw / Mn.
- the dihalogeno compound (A) and the dihydric phenol (B) were dissolved in an organic polar solvent as the first step, and the second step was obtained in the first step.
- the alkali metal salt of carbonic acid is added to the solution to polycondense the dihalogeno compound (A) and the dihydric phenol (B), and as a third stage, unreacted from the reaction mixture obtained in the second stage.
- An alkali polysulfone is obtained by removing the alkali metal salt of carbonic acid, the by-produced alkali halide, and the organic polar solvent.
- the melting temperature in the first stage is preferably 40 to 180 ° C.
- the polycondensation temperature in the second stage is preferably 180 to 400 ° C., more preferably 300 to 400 ° C., and further preferably more than 300 ° C. and 360 ° C. or less. If no side reaction occurs, the higher the polycondensation temperature, the faster the target polycondensation proceeds, and the higher the degree of polymerization of the resulting aromatic polysulfone. As a result, the aromatic polysulfone tends to have a reduced viscosity, Mn increases, and Mw / Mn decreases.
- the temperature is gradually raised while removing by-product water, and after reaching the reflux temperature of the organic polar solvent, further preferably 1 to 50 hours, more preferably 2 It is preferably carried out by keeping the temperature for 30 hours. If no side reaction occurs, the longer the polycondensation time, the more the target polycondensation proceeds, and the higher the degree of polymerization of the aromatic polysulfone obtained. As a result, the aromatic polysulfone tends to have a reduced viscosity, Mn increases, and Mw / Mn decreases.
- Examples of the poor solvent for aromatic polysulfone include methanol, ethanol, 2-propanol, hexane, heptane, and water, and methanol is preferable because it can be easily removed.
- Aromatic polysulfone may be obtained by extracting and removing impurities such as a solvent. Specifically, the reaction mixture may be cooled and solidified, then pulverized, and the resulting powder may be washed to extract and remove impurities to obtain aromatic polysulfone.
- the washing first, unreacted alkali metal salt of carbonic acid and by-produced alkali halide are extracted from the powder with water, the aromatic polysulfone is not dissolved, and the organic polar solvent is dissolved (uniformly).
- the organic polar solvent may be extracted and removed with the solvent to be mixed.
- the water used for extraction of the unreacted alkali metal salt of carbonic acid and the by-produced alkali halide is preferably warm water.
- the temperature of the hot water used for extraction is preferably 40 to 80 ° C.
- the volume average particle size of the powder is preferably 200 to 2000 ⁇ m, more preferably 250 to 1500 ⁇ m, and further preferably 300 to 1000 ⁇ m from the viewpoint of extraction efficiency and workability during extraction.
- the volume average particle diameter of the powder is equal to or more than the lower limit, solidification during extraction and clogging during filtration and drying after extraction are highly suppressed. Moreover, extraction efficiency becomes higher because the volume average particle diameter of the said powder is below the said upper limit.
- the “volume average particle diameter” can be measured by a laser diffraction method.
- the extraction solvent examples include, for example, a mixed solvent of acetone and methanol when diphenyl sulfone is used as a polymerization solvent.
- the mixing ratio of acetone and methanol is usually determined from the viewpoint of extraction efficiency and stickiness of the aromatic polysulfone powder.
- dihydric phenol (B) and an alkali metal carbonate are reacted in an organic polar solvent to remove by-product water.
- the dihalogeno compound (A) is added to the reaction mixture obtained in the first stage to perform polycondensation
- the third stage as in the case of the method described above, Unreacted alkali metal salt of carbonic acid, by-produced alkali halide and organic polar solvent are removed from the reaction mixture obtained in two steps to obtain aromatic polysulfone.
- azeotropic dehydration may be performed by adding an organic solvent azeotropic with water in order to remove by-product water in the first stage.
- organic solvent azeotropic with water include benzene, chlorobenzene, toluene, methyl isobutyl ketone, hexane, cyclohexane and the like.
- the temperature for azeotropic dehydration is preferably 70 to 200 ° C.
- the reaction temperature in the second stage polycondensation is usually 180 to 400 ° C., preferably 300 to 400 ° C., more preferably more than 300 ° C. and 360 ° C. or less.
- the polycondensation temperature is set so that an aromatic polysulfone having a predetermined reduced viscosity, Mn and Mw / Mn is obtained in consideration of the degree of side reaction. It is necessary to adjust the polycondensation time.
- the aromatic polysulfone of the present invention has a number average molecular weight (Mn) and a weight average molecular weight (Mw) ratio value (Mw / Mn) of 1.80 or more and less than 1.90, and the number average molecular weight.
- Mn is 6000 or more and less than 14,000, a high glass transition temperature can be expressed.
- Mn and Mw / Mn of aromatic polysulfone as described above, the ratio of the amount of dihalogeno compound (A) used during polymerization and the amount of dihydric phenol (B) used, the amount of alkali metal carbonate used, It can be adjusted by controlling the reaction conditions of the second stage polycondensation temperature and the second stage polymerization time.
- reaction conditions are independently controlled for the purpose of adjusting Mn and Mw / Mn of the aromatic polysulfone, and can be arbitrarily combined.
- the aromatic polysulfone obtained by the above method has a number average molecular weight (Mn) and a weight average molecular weight (Mw) ratio value (Mw / Mn) of 1.80 or more and less than 1.90, It can be purified or adjusted by a known method so that the molecular weight (Mn) is 6000 or more and less than 14,000.
- the aromatic polysulfone of the present invention Since the aromatic polysulfone of the present invention has a high glass transition temperature and excellent heat resistance, its function is sufficiently exhibited even under severe heat treatment conditions.
- the aromatic polysulfone of the present invention also has good adhesion to materials such as metal, glass and ceramic. Therefore, the aromatic polysulfone of the present invention is suitable as a coating material for members such as metal, glass or ceramic.
- a resin composition hereinafter, also referred to as a resin solution
- the resin coating film can be formed on the surface of the member.
- the aromatic polysulfone of the present invention is suitable for use in fields such as automobiles and aircraft.
- a second aspect of the present invention is a prepreg formed from the aromatic polysulfone according to the first aspect of the present invention, a liquid epoxy resin, a curing agent, and reinforcing fibers.
- Epoxy resin is not particularly limited as long as it is a liquid epoxy resin, and for example, bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, and the like can be used as appropriate.
- liquid as used herein means a liquid state at 0 to 40 ° C.
- the curing agent is not particularly limited as long as it can react with the epoxy resin, but an amine curing agent is preferably used.
- examples of the curing agent include tetramethylguanidine, imidazole or derivatives thereof, carboxylic acid hydrazides, tertiary amines, aromatic amines, aliphatic amines, dicyandiamide or derivatives thereof.
- the reinforcing fiber is preferably at least one selected from the group consisting of carbon fiber, glass fiber, and aramid fiber from the viewpoint of strength, and more preferably carbon fiber. These reinforcing fibers may be woven fabric or non-woven fabric. Moreover, the use of the aromatic polysulfone resin of the present invention is not limited to this, and can also be used as a coating material for a member such as metal, glass or ceramic.
- a third aspect of the present invention is a method for producing a prepreg, comprising the step of impregnating a reinforcing fiber into a mixture obtained by mixing the aromatic polysulfone according to the first aspect of the present invention, a liquid epoxy resin, and a curing agent. Is the method.
- the method for producing the prepreg is not particularly limited.
- the mixture may be impregnated with reinforcing fibers.
- the solvent to be used include methyl ethyl ketone, methanol, dimethyl sulfoxide, N, N-dimethylformamide, N-methylpyrrolidone, dimethylacetamide and the like.
- Examples of methods for impregnating the mixture with reinforcing fibers include a wet method and a hot melt method (also referred to as a dry method).
- the wet method is a method of impregnating the aromatic fibers with aromatic polysulfone by immersing the reinforcing fibers in the mixture, then pulling up the reinforcing fibers and evaporating the solvent from the reinforcing fibers using an oven or the like.
- the hot melt method is a method of impregnating a reinforcing fiber directly with the mixture whose viscosity has been reduced by heating, or a film in which the mixture is coated on a release paper or the like, and then from both sides or one side of the reinforcing fiber. In this method, the reinforcing fibers are impregnated with a resin by overlapping the films and heating and pressing.
- the prepreg is manufactured by, for example, heating to 120 to 140 ° C. and semi-curing the impregnated epoxy resin. be able to.
- “semi-cured” means a state in which the viscosity or hardness of the epoxy resin has increased until a certain shape can be maintained, and the viscosity or hardness has increased from the above state to a state in which the viscosity or hardness can be further increased. It refers to a state that can be increased.
- the glass transition temperature was calculated by a method according to JIS-K7121 using a differential scanning calorimeter (DSC-50 manufactured by Shimadzu Corporation). About 10 mg of the sample was weighed and raised to 340 ° C. at a heating rate of 10 ° C./min, then cooled to 40 ° C., and again raised to 340 ° C. at a heating rate of 10 ° C./min. From the DSC chart obtained by the second temperature increase, the glass transition temperature was calculated by a method according to JIS-K7121.
- Example 2 Into a polymerization tank equipped with a stirrer, a nitrogen introduction tube, a thermometer, and a condenser with a receiver at the tip, bis (4-hydroxyphenyl) sulfone (300.3 g), bis (4-chlorophenyl) sulfone (334. 3 g) and diphenyl sulfone (563.3 g) as a polymerization solvent were charged, and the temperature was raised to 180 ° C. while nitrogen gas was circulated in the system. After adding potassium carbonate (161.4 g) to the obtained solution, the temperature was gradually raised to 300 ° C., and the mixture was further reacted at 300 ° C. for 3 hours.
- the obtained reaction solution was cooled to room temperature, solidified, finely pulverized, then washed several times with warm water and with a mixed solvent of acetone and methanol, and the powder impregnated with the solvent obtained by filtration at 150 ° C. Heat drying was performed to obtain aromatic polysulfone as a powder.
- Table 1 shows the Mw / Mn and glass transition temperature of the obtained aromatic polysulfone.
- the obtained reaction solution is cooled to room temperature, solidified, finely pulverized, then washed several times with warm water and with a mixed solvent of acetone and methanol, and a powder impregnated with the solvent obtained by decantation and filtration is obtained. Heating and drying at 150 ° C. gave an aromatic polysulfone as a powder.
- Table 1 shows the Mw / Mn and glass transition temperature of the obtained aromatic polysulfone.
- the present invention is extremely useful industrially because it can be used in the field of materials that require high heat resistance, such as coating materials for materials such as metals, glass, and ceramics.
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Abstract
Description
本願は、2016年2月5日に、日本に出願された特願2016-021123号、及び2016年9月15日に、日本に出願された特願2016-180849号に基づき優先権を主張し、その内容をここに援用する。
しかし、これら芳香族ポリスルホンにはさらなる耐熱性の向上が望まれ、高いガラス転移温度(Tg)を発現させるためには未だ改良の余地がある。
電子機器を製造する際には電子機器の構成部品は、例えば、リフロー工程のように部品を高温に曝すことがある。部品の変形を抑制するためには、高いガラス転移温度(Tg)の発現が求められる。また、電子機器に限らず、高温条件下に曝される部材については、同様の問題が生じうる。
R1、R2、R3及びR4は、互いに独立に、炭素数1~4のアルキル基又は炭素数1~4のアルコキシ基を表す。n1、n2、n3及びn4は、互いに独立に、0~4の整数を表す。n1、n2、n3又はn4が2~4の整数である場合、複数個のR1、R2、R3又はR4は、それぞれ互いに同一であっても異なっていてもよい。]
本発明の第3の態様は、前記本発明の第1の態様の芳香族ポリスルホンと、液状のエポキシ樹脂と、硬化剤とを混合した混合物に、強化繊維を含浸させる工程を有する、プリプレグの製造方法である。
[1]式(A)で表されるジハロゲノ化合物(A)と、式(B)で表される二価フェノール(B)と、を重合して得られる熱可塑性の芳香族ポリスルホンであって、
数平均分子量であるMnと重量平均分子量であるMwとの比の値であるMw/Mnが、1.80以上1.90未満であり、数平均分子量であるMnが6000以上14000未満である、芳香族ポリスルホン。
R1、R2、R3及びR4は、互いに独立に、炭素数1~4のアルキル基又は炭素数1~4のアルコキシ基を表し;
n1、n2、n3及びn4は、互いに独立に、0~4の整数を表し;n1、n2、n3又はn4が2~4の整数である場合、複数個のR1、R2、R3又はR4は、それぞれ互いに同一でも異なっていてもよい。]
[2]前記式(A)において、X及びX’が塩素原子である、[1]記載の芳香族ポリスルホン。
[3]前記式(A)又は前記式(B)において、n1、n2、n3及びn4が0である[1]又は[2]に記載の芳香族ポリスルホン。
[4][1]~[3]のいずれか1つに記載の芳香族ポリスルホンと、液状のエポキシ樹脂と、硬化剤と、強化繊維とから形成されたプリプレグ。
[5][1]~[3]のいずれか1つに記載の芳香族ポリスルホンと、液状のエポキシ樹脂と、硬化剤とを混合した混合物に、強化繊維を含浸させる工程を含む、プリプレグの製造方法。
本発明の芳香族ポリスルホンは、下記式(A)で表されるジハロゲノ化合物(A)と、下記式(B)で表される二価フェノール(B)と、を重合して得られる熱可塑性の芳香族ポリスルホンであって、数平均分子量(Mn)と重量平均分子量(Mw)の比の値(Mw/Mn、すなわち、多分散度)が1.80以上1.90未満であり、数平均分子量(Mn)が6000以上14000未満の芳香族ポリスルホンである。
本発明の芳香族ポリスルホンの別の側面は、下記式(A)で表されるジハロゲノ化合物(A)と、下記式(B)で表される二価フェノール(B)と、が重合しており、数平均分子量であるMnと重量平均分子量であるMwとの比の値であるMw/Mnが、1.80以上1.90未満であり、数平均分子量であるMnが6000以上14000未満である、熱可塑性の芳香族ポリスルホンである。
本発明の芳香族ポリスルホンのさらに別の側面は、下記式(A)で表されるジハロゲノ化合物(A)由来の構成単位と、下記式(B)で表される二価フェノール(B)由来の構成単位と、を含み、数平均分子量であるMnと重量平均分子量であるMwとの比の値であるMw/Mnが、1.80以上1.90未満であり、数平均分子量であるMnが6000以上14000未満である、熱可塑性の芳香族ポリスルホンである。
ここで、「由来」とは、ジハロゲノ化合物(A)と二価フェノール(B)とが重合するために、化学構造が変化することを意味する。 本明細書においては、式(A)で表されるジハロゲノ化合物(A)を、単に「ジハロゲノ化合物(A)」ということがある。また、式(B)で表される二価フェノール(B)を、単に「二価フェノール(B)」ということがある。
本発明の芳香族ポリスルホンは、ジハロゲノ化合物(A)及び二価フェノール(B)をモノマーとし、Mw/Mn及びMnが、上記の条件を満たしていることで、高いガラス転移温度を発現でき、優れた耐熱性を示す。
R1、R2、R3及びR4は、互いに独立に、炭素数1~4のアルキル基又は炭素数1~4のアルコキシ基を表し;
n1、n2、n3及びn4は、互いに独立に、0~4の整数を表し;n1、n2、n3又はn4が2~4の整数である場合、複数個のR1、R2、R3又はR4は、それぞれ互いに同一であっても異なっていてもよい。]
ジハロゲノ化合物(A)は、式(A)で表される化合物である。
式(A)中、X及びX’は、互いに独立に、ハロゲン原子を表す。前記ハロゲン原子の例としては、塩素原子、臭素原子、及びヨウ素原子が挙げられるが、塩素原子であることが好ましい。
X及びX’は、それぞれベンゼン環骨格のスルホニル基(-SO2-)が結合している炭素原子の位置番号を1位としたとき、ベンゼン環骨格の2位、3位及び4位のいずれの炭素原子に結合していてもよいが、4位の炭素原子に結合していることが好ましい。すなわち、ジハロゲノ化合物(A)は、水素原子に代わってR3及びR4のいずれか一方又は両方が結合していてもよいビス(4-クロロフェニル)スルホンであることが好ましい。
R3及びR4における前記アルキル基は、直鎖状、分岐鎖状及び環状のいずれでもよいが、直鎖状又は分枝鎖状であることが好ましく、その例としては、メチル基、エチル基、n-プロピル基、イソプロピル基、n-ブチル基、イソブチル基、sec-ブチル基、及びtert-ブチル基が挙げられる。
R3及びR4における前記アルコキシ基は、直鎖状、分岐鎖状及び環状のいずれでもよいが、直鎖状又は分枝鎖状であることが好ましく、その例としては、メトキシ基、エトキシ基、n-プロポキシ基、イソプロポキシ基、n-ブトキシ基、イソブトキシ基、sec-ブトキシ基、及びtert-ブトキシ基が挙げられる。
n3及びn4が、0以外である場合、対応するR3又はR4の結合位置は特に限定されない。ベンゼン環骨格のスルホニル基が結合している炭素原子の位置番号を1位としたとき、R3又はR4は、ベンゼン環骨格の2位、3位、4位、5位及び6位のいずれの炭素原子に結合していてもよい。ただし、R3又はR4の結合位置として、X又はX’が結合している炭素原子を除く。R3又はR4は、4位以外の炭素原子に結合していることが好ましく、3位もしくは5位、又は3位及び5位の炭素原子に結合していることがより好ましい。
n3又はn4が2~4の整数である場合、複数個のR3又はR4は、それぞれ互いに同一であっても異なっていてもよい。例えば、n3が2~4の整数である場合、n3個のR3は、すべて同一であってもよいし、すべて異なっていてもよく、n3が3又は4である場合には、一部のみ同一であってもよい。n4個のR4も、n3個のR3の場合と同様である。
n3及びn4は、互いに独立に、0~3の整数あることが好ましく、0~2の整数であることがより好ましく、0又は1であることがさらに好ましい。
二価フェノール(B)は、式(B)で表される化合物である。
二価フェノール(B)において、2個のヒドロキシ基(-OH)は、それぞれベンゼン環骨格のスルホニル基が結合している炭素原子の位置番号を1位としたとき、ベンゼン環骨格の2位、3位及び4位のいずれの炭素原子に結合していてもよいが、4位の炭素原子に結合していることが好ましい。すなわち、二価フェノール(B)は、水素原子に代わってR1及びR2のいずれか一方又は両方が結合していてもよいビス(4-ヒドロキシフェニル)スルホンであることが好ましい。ビス(4-ヒドロキシフェニル)スルホンは、4,4’-ジヒドロキシジフェニルスルホンとも言う。
また、n1はR1の結合数であり、n2はR2の結合数であり、互いに独立に、0~4の整数を表す。n1及びn2が、0以外である場合、対応するR1又はR2の結合位置は特に限定されない。ベンゼン環骨格のスルホニル基が結合している炭素原子の位置番号を1位としたとき、R1又はR2はベンゼン環骨格の2位、3位、4位、5位及び6位のいずれの炭素原子に結合していてもよい。ただし、R1又はR2の結合位置として、ヒドロキシ基が結合している炭素原子を除く。R1又はR2は、4位以外の炭素原子に結合していることが好ましく、3位もしくは5位、又は3位及び5位の炭素原子に結合していることが好ましい。
n1又はn2が2~4の整数である場合、複数個のR1又はR2は、それぞれ互いに同一でも異なっていてもよい。例えば、n1が2~4の整数である場合、n1個のR1は、すべて同一であってもよいし、すべて異なっていてもよく、n1が3又は4である場合には,R1は一部のみ同一であってもよい。n2個のR2も、n1個のR1の場合と同様である。
n1及びn2は、互いに独立に、0~3の整数あることが好ましく、0~2の整数であることがより好ましく、0又は1であることがさらに好ましい。
すなわち、本発明の芳香族ポリスルホンの還元粘度が上記範囲内であると耐熱性や強度・剛性が向上し易く、かつ溶融温度や溶融粘度が高くなりすぎず、流動性も低くなりにくい。
Mnが前記下限値以上であることで、芳香族ポリスルホンは耐熱性に顕著に優れる。
また、本発明の芳香族ポリスルホンの数平均分子量(Mn)は14000未満であり、好ましくは13500以下、より好ましくは13000以下、さらに好ましくは12500以下、よりさらに好ましくは12000以下、特に好ましくは11500以下である。
Mnが前記上限値以下であることで、芳香族ポリスルホンは耐熱性に顕著に優れる。
なお、上記Mnの上限値及び下限値は、任意に組み合わせることができる。
本発明の芳香族ポリスルホンの数平均分子量(Mn)は、例えば、6000以上14000未満であり、7000以上13000以下が好ましく、7500以上12000以下がより好ましく、7500以上11500以下がさらに好ましく、8000~11000であることが特に好ましい。
Mw/Mnの値が前記下限値以上であることで、芳香族ポリスルホンは高いガラス転移温度を発現することができる。
上記Mw/Mnの上限値及び下限値は任意に組み合わせることができる。
本発明の芳香族ポリスルホンにおいて、Mw/Mnの値は、例えば、1.82以上1.87以下であることがとりわけ好ましい。
ジハロゲノ化合物(A)と二価フェノール(B)とを溶媒中で反応させる工程(以下、「重合」と記載する)について説明する。
ジハロゲノ化合物(A)と二価フェノール(B)との重合(以下、重縮合ということもある)は、塩基として炭酸のアルカリ金属塩を用いて行われるか、又は重合溶媒である有機溶媒中で行われることが好ましく、塩基として炭酸のアルカリ金属塩を用い、且つ有機溶媒中で行われることがより好ましい。
好ましい前記炭酸アルカリの例としては、炭酸ナトリウム、炭酸カリウム等が挙げられる。
好ましい前記重炭酸アルカリの例としては、重炭酸ナトリウム(炭酸水素ナトリウムともいう)、重炭酸カリウム(炭酸水素カリウムともいう)等が挙げられる。
前記有機極性溶媒の例としては、ジメチルスルホキシド、1-メチル-2-ピロリドン、スルホラン(1,1-ジオキソチオランともいう)、1,3-ジメチル-2-イミダゾリジノン、1,3-ジエチル-2-イミダゾリジノン、ジメチルスルホン、ジエチルスルホン、ジイソプロピルスルホン、ジフェニルスルホン等が挙げられる。
ここで、抽出に用いる温水の温度は40~80℃であると好ましい。
本明細書において、「体積平均粒径」は、レーザ回折法により測定することができる。
芳香族ポリスルホンのMn及びMw/Mnについては、上述のように重合時のジハロゲノ化合物(A)の使用量と二価フェノール(B)の使用量との比率、炭酸のアルカリ金属塩の使用量、第2段階の重縮合温度、第2段階の重合時間の各反応条件を制御することにより調整可能である。これらの反応条件は、芳香族ポリスルホンのMn及びMw/Mnを調整する目的でそれぞれ独立して制御し、任意に組み合わせることができる。 また、上述の方法により得られた芳香族ポリスルホンを、数平均分子量(Mn)と重量平均分子量(Mw)の比の値(Mw/Mn)が1.80以上1.90未満であり、数平均分子量(Mn)が6000以上14000未満となるように、公知の方法により精製又は調整することができる。
本発明の第2の態様は、前記本発明の第1の態様の芳香族ポリスルホンと、液状のエポキシ樹脂と、硬化剤と、強化繊維とから形成されたプリプレグである。
エポキシ樹脂としては、特に液状のエポキシ樹脂であれば限定されず、例えばビスフェノールA型エポキシ樹脂、ビスフェノールF型エポキシ樹脂、ビスフェノールS型エポキシ樹脂等を適宜用いることができる。
ここでいう「液状」とは、0~40℃において液体の状態であることを意味する。
硬化剤としては、前記エポキシ樹脂と反応し得るものであれば特に限定はないが、アミン系硬化剤が好ましく用いられる。かかる硬化剤としては、例えば、テトラメチルグアニジン、イミダゾール又はその誘導体、カルボン酸ヒドラジド類、3級アミン、芳香族アミン、脂肪族アミン、ジシアンジアミド又はその誘導体等が挙げられる。
強化繊維としては、強度の観点から、炭素繊維、ガラス繊維及びアラミド繊維からなる群から選ばれる少なくとも1種であることが好ましく、炭素繊維であることがより好ましい。これらの強化繊維は、織布又は不織布であってもよい。また、本発明の芳香族ポリスルホン樹脂の用途はこれに限定されず、金属、ガラス又はセラミック等の部材のコーティング材等として用いることもできる。
本発明の第3の態様は、前記本発明の第1の態様の芳香族ポリスルホンと、液状のエポキシ樹脂と、硬化剤とを混合した混合物に、強化繊維を含浸させる工程を含む、プリプレグの製造方法である。
プリプレグの製造方法は特に限定されず、前記本発明の第1の態様の芳香族ポリスルホンと、液状のエポキシ樹脂と、硬化剤とを、メチルエチルケトン、メタノール等の溶媒に溶解させた混合物を調整し、前記混合物に強化繊維を含浸させればよい。用いる溶媒としては、メチルエチルケトン、メタノールの他、ジメチルスルホキシド,N,N-ジメチルホルムアミド、N-メチルピロリドン、ジメチルアセトアミド等を挙げることができる。
前記混合物に強化繊維を含浸させる方法としては、ウェット法とホットメルト法(ドライ法ともいう)等を挙げることができる。
ウェット法は、前記混合物に強化繊維を浸漬した後、強化繊維を引き上げ、オーブン等を用いて強化繊維から溶媒を蒸発させることにより、芳香族ポリスルホン等を強化繊維に含浸させる方法である。
ホットメルト法は、加熱により低粘度化した前記混合物を直接強化繊維に含浸させる方法、又は離型紙等の上に前記混合物をコーティングしたフィルムを作製しておき、次いで強化繊維の両側又は片側から前記フィルムを重ね、加熱加圧することにより、強化繊維に樹脂を含浸させる方法である。
本明細書において「半硬化」とは、一定の形状が維持できるまで前記エポキシ樹脂の粘度又は硬度が増加した状態であって、前記状態からさらに粘度又は硬度が増加し得る状態まで粘度又は硬度が増加可能である状態を指す。
なお、本実施例においては、芳香族ポリスルホンの評価は、下記方法で物性を測定することにより行った。
下記条件でゲル浸透クロマトグラフィー(GPC)分析を行い、Mn及びMwを測定し、Mw/Mnを算出した。Mn及びMwについてはいずれも2回測定し、その平均値を求めて、それぞれMn及びMwとし、さらに平均値として求めたMn及びMwからMw/Mnの値を求めた。
(測定条件)
試料:濃度が0.002g/mLである芳香族ポリスルホンのN,N-ジメチルホルムアミド溶液
試料注入量:100μL
カラム:東ソー社製「TSKgel GMHHR-H」(7.8mmφ×300mm)を2本直列に連結
カラム温度:40℃
溶離液:N,N-ジメチルホルムアミド
溶離液流量:0.8mL/分
検出器:示差屈折率計(RI)+光散乱光度計(LS)
標準試薬:ポリスチレン
示差走査熱量測定装置(島津製作所製DSC-50)を用い、JIS-K7121に準じた方法でガラス転移温度を算出した。サンプル約10mgを秤量し、昇温速度10℃/minで340℃まで上昇させた後、40℃まで冷却し、再び昇温速度10℃/minで340℃まで上昇させた。2回目の昇温で得られたDSCチャートより、JIS-K7121に準じた方法でガラス転移温度を算出した。
[実施例1]
撹拌機、窒素導入管、温度計、及び先端に受器を付したコンデンサーを備えた重合槽に、ビス(4-ヒドロキシフェニル)スルホン(300.3g)、ビス(4-クロロフェニル)スルホン(334.3g)、及び重合溶媒としてジフェニルスルホン(563.3g)を仕込み、系内に窒素ガスを流通させながら180℃まで昇温した。得られた溶液に、炭酸カリウム(161.4g)を添加した後、305℃まで徐々に昇温し、305℃でさらに3時間反応させた。得られた反応液を室温まで冷却して固化させ、細かく粉砕した後、温水による洗浄並びにアセトン及びメタノールの混合溶媒による洗浄を数回行い、ろ過により得られた溶媒を含浸する粉末を150℃で加熱乾燥させ、芳香族ポリスルホンを粉末として得た。得られた芳香族ポリスルホンのMw/Mn及びガラス転移温度を表1に示す。
撹拌機、窒素導入管、温度計、及び先端に受器を付したコンデンサーを備えた重合槽に、ビス(4-ヒドロキシフェニル)スルホン(300.3g)、ビス(4-クロロフェニル)スルホン(334.3g)、及び重合溶媒としてジフェニルスルホン(563.3g)を仕込み、系内に窒素ガスを流通させながら180℃まで昇温した。得られた溶液に、炭酸カリウム(161.4g)を添加した後、300℃まで徐々に昇温し、300℃でさらに3時間反応させた。得られた反応液を室温まで冷却して固化させ、細かく粉砕した後、温水による洗浄並びにアセトン及びメタノールの混合溶媒による洗浄を数回行い、ろ過により得られた溶媒を含浸する粉末を150℃で加熱乾燥させ、芳香族ポリスルホンを粉末として得た。得られた芳香族ポリスルホンのMw/Mn及びガラス転移温度を表1に示す。
撹拌機、窒素導入管、温度計、及び先端に受器を付したコンデンサーを備えた重合槽に、ビス(4-ヒドロキシフェニル)スルホン(300.3g)、ビス(4-クロロフェニル)スルホン(331.8g)、及び重合溶媒としてジフェニルスルホン(563.3g)を仕込み、系内に窒素ガスを流通させながら180℃まで昇温した。得られた溶液に、炭酸カリウム(160.5g)を添加した後、290℃まで徐々に昇温し、290℃でさらに3時間反応させた。得られた反応液を室温まで冷却して固化させ、細かく粉砕した後、温水による洗浄並びにアセトン及びメタノールの混合溶媒による洗浄を数回行い、デカンテーション及びろ過により得られた溶媒を含浸する粉末を150℃で加熱乾燥させ、芳香族ポリスルホンを粉末として得た。得られた芳香族ポリスルホンのMw/Mn及びガラス転移温度を表1に示す。
Claims (5)
- 式(A)で表されるジハロゲノ化合物(A)と、式(B)で表される二価フェノール(B)と、を重合して得られる熱可塑性の芳香族ポリスルホンであって、
数平均分子量であるMnと重量平均分子量であるMwとの比の値であるMw/Mnが1.80以上1.90未満であり、
数平均分子量(Mn)が6000以上14000未満である、
芳香族ポリスルホン。
R1、R2、R3及びR4は、互いに独立に、炭素数1~4のアルキル基又は炭素数1~4のアルコキシ基を表し;
n1、n2、n3及びn4は、互いに独立に、0~4の整数を表し;
n1、n2、n3又はn4が2~4の整数である場合、複数個のR1、R2、R3又はR4は、それぞれ互いに同一でも異なっていてもよい。] - 式(A)において、X及びX’が塩素原子である、請求項1記載の芳香族ポリスルホン。
- 前記式(A)又は前記式(B)において、n1、n2、n3及びn4が0である請求項1又は2に記載の芳香族ポリスルホン。
- 請求項1~3のいずれか1項に記載の芳香族ポリスルホンと、液状のエポキシ樹脂と、硬化剤と、強化繊維とから形成されたプリプレグ。
- 請求項1~3のいずれか1項に記載の芳香族ポリスルホンと、液状のエポキシ樹脂と、硬化剤とを混合した混合物に、強化繊維を含浸させる工程を含む、プリプレグの製造方法。
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