WO2019208576A1 - ハイドロゲル及びハイドロゲルの製造方法 - Google Patents
ハイドロゲル及びハイドロゲルの製造方法 Download PDFInfo
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- WO2019208576A1 WO2019208576A1 PCT/JP2019/017264 JP2019017264W WO2019208576A1 WO 2019208576 A1 WO2019208576 A1 WO 2019208576A1 JP 2019017264 W JP2019017264 W JP 2019017264W WO 2019208576 A1 WO2019208576 A1 WO 2019208576A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/50—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
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- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
- C08F220/585—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS]
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- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
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- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
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- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0025—Crosslinking or vulcanising agents; including accelerators
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- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/24—Homopolymers or copolymers of amides or imides
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- C08J2400/00—Characterised by the use of unspecified polymers
- C08J2400/14—Water soluble or water swellable polymers, e.g. aqueous gels
Definitions
- the present disclosure relates to a hydrogel and a method for producing the hydrogel.
- hydrogels having a first network structure and a second network structure are known.
- the second network structure is intertwined with the first network structure.
- Each of the first network structure and the second network structure is formed by polymerizing monomers and crosslinking them.
- the hydrogel is disclosed in Patent Document 1.
- hydrogels were liable to decrease in elastic modulus and strength under acidic conditions.
- One aspect of the present disclosure is a hydrogel including a first network structure and a second network structure intertwined with the first network structure, and the first network structure is crosslinked by a first crosslinking agent.
- the second network structure includes a polymer crosslinked by a second crosslinking agent, and 50 mol% or more of the first crosslinking agent does not include a degradable bond, and among the second crosslinking agent, 50 mol% or more is a hydrogel containing no degradable bond.
- the hydrogel that is one aspect of the present disclosure is less susceptible to hydrolysis at the cross-linking point even under acidic conditions. Therefore, the hydrogel which is one aspect of the present disclosure is less likely to decrease in elastic modulus and strength even under acidic conditions.
- a first monomer is polymerized and crosslinked with a first crosslinking agent to form a first network structure, and the second monomer and the second crosslinking agent are included in the first network structure.
- Introducing, polymerizing the second monomer, and crosslinking with the second crosslinking agent to form a second network structure intertwined with the first network structure, and 50 mol% or more of the first crosslinking agent is in addition, 50 mol% or more of the second crosslinking agent does not contain degradable bonds, and is a method for producing a hydrogel that does not contain degradable bonds.
- the hydrogel produced by the hydrogel production method according to another aspect of the present disclosure is less susceptible to hydrolysis at the crosslinking point even under acidic conditions. Therefore, the hydrogel manufactured by the method for manufacturing a hydrogel which is another aspect of the present disclosure is less likely to decrease in elastic modulus and strength even under acidic conditions.
- Hydrogel The hydrogel of this indication is provided with the 1st network structure and the 2nd network structure.
- the second network structure is intertwined with the first network structure.
- the first network structure and the second network structure each include a polymer formed by polymerizing monomers.
- the monomer constituting the first network structure is defined as the first monomer.
- the monomer which comprises a 2nd network structure be a 2nd monomer.
- Examples of the first monomer and the second monomer include a monomer having a charge.
- Examples of the charged monomer include 2-acrylamido-2-methylpropanesulfonic acid, acrylic acid, methacrylic acid, and salts thereof.
- Examples of the first monomer and the second monomer include electrically neutral monomers.
- Examples of the electrically neutral monomer include acrylamide, N′N-dimethylacrylamide, N-isopropylacrylamide, vinylpyridine, styrene, methyl methacrylate, fluorine-containing unsaturated monomer, hydroxyethyl acrylate, and vinyl acetate. It is done.
- Examples of the fluorine-containing unsaturated monomer include trifluoroethyl acrylate.
- the first monomer and the second monomer may be different types of monomers, or may be the same type of monomers.
- first monomer and the second monomer are different types of monomers, for example, one of the first monomer and the second monomer is a charged monomer, and the other of the first monomer and the second monomer is electrically It may be a neutral monomer. Further, the first monomer and the second monomer may both be charged monomers. When the first monomer and the second monomer are both charged monomers, different monomers from 2-acrylamido-2-methylpropanesulfonic acid, acrylic acid, methacrylic acid, and salts thereof may be selected. . Further, both the first monomer and the second monomer may be electrically neutral.
- acrylamide N′N-dimethylacrylamide, N-isopropylacrylamide, vinylpyridine, styrene, methyl methacrylate, fluorine-containing unsaturated monomer, hydroxyethyl acrylate, And different monomers may be selected from vinyl acetate.
- the first monomer is polymerized to form a polymer.
- the polymer is crosslinked with a first crosslinking agent to form a first network structure.
- a first crosslinking agent 50 mol% or more is a crosslinking agent that does not contain degradable bonds.
- first cross-linking agent 60 mol% or more is preferably a cross-linking agent that does not contain degradable bonds, and among the first cross-linking agent, 75 mol% or more is a cross-linking agent that does not contain degradable bonds. Further preferred. The higher the ratio of the cross-linking agent that does not contain degradable bonds in the first cross-linking agent, the more difficult the elastic modulus and strength of the hydrogel of the present disclosure decrease even under acidic conditions.
- the second monomer is polymerized to form a polymer.
- the polymer is crosslinked with a second crosslinking agent to form a second network structure.
- a crosslinking agent that does not contain degradable bonds.
- the second crosslinking agent is preferably a crosslinking agent that does not contain degradable bonds, and 75 mol% or more of the second crosslinking agent may be a crosslinking agent that does not contain degradable bonds. Further preferred. The higher the ratio of the cross-linking agent that does not contain degradable bonds among the second cross-linking agents, the lower the elastic modulus and strength of the hydrogel of the present disclosure are even more difficult under acidic conditions.
- the second crosslinking agent the same one as the first crosslinking agent can be used.
- the degradable bond means a bond that is easily hydrolyzed under acidic conditions.
- the decomposable bond include an ester bond, an amide bond, and a thioester bond.
- the first cross-linking agent that does not include a degradable bond and the second cross-linking agent that does not include a decomposable bond include, for example, divinylbenzene, divinylpyridine, divinylbiphenyl, divinylsulfone, and the like, independently of each other.
- All of the first crosslinking agent may be a crosslinking agent that does not contain a degradable bond, or a part of the first crosslinking agent may be a crosslinking agent that contains a degradable bond.
- All of the second crosslinking agent may be a crosslinking agent that does not contain a degradable bond, or a part of the second crosslinking agent may be a crosslinking agent that contains a degradable bond.
- Examples of the crosslinking agent containing a degradable bond in the first crosslinking agent and the second crosslinking agent include N, N′-methylenebisacrylamide, ethylene glycol dimethacrylate, and the like.
- the first crosslinking agent and the second crosslinking agent may be the same crosslinking agent or different crosslinking agents.
- the main chains constituting the first network structure and the second network structure do not contain degradable bonds.
- the main chain refers to a main chain of a polymer formed from a first monomer or a main chain of a polymer formed from a second monomer.
- hydrolysis of the main chain hardly occurs even under acidic conditions.
- the elastic modulus and strength of the hydrogel of the present disclosure are less likely to decrease even under acidic conditions.
- the initial elastic modulus ratio X defined by the following formula (1) is preferably 50% or more.
- Formula (1) (E2 / E1) ⁇ 100 (E2 in Formula (1) is the elastic modulus of the hydrogel after the treatment immersed in a hydrochloric acid aqueous solution having a hydrochloric acid concentration of 0.05 mol / L and a temperature of 60 ° C. for 72 hours. E1 is the value before the treatment. Elastic modulus of hydrogel in When the initial elastic modulus ratio X is 50% or more, the hydrogel of the present disclosure is less likely to decrease in elastic modulus and strength even under acidic conditions.
- the degree of crosslinking in the first network structure is preferably in the range of 0.1 to 50 mol%, for example.
- the degree of crosslinking means a value expressed as a percentage of the molar ratio of the crosslinking agent to the charged molar concentration of the monomer. In some cases, there are a few monomers that were not actually involved in the polymerization and a crosslinking agent that was not involved in the crosslinking. In this case as well, the meaning of the degree of crosslinking in the present specification is as described above.
- the degree of crosslinking in the second network structure is preferably in the range of 0.001 to 20 mol%, for example. When the crosslinking degree in the first network structure and the second network structure is within the above range, the mechanical strength of the hydrogel of the present disclosure is higher.
- the first network structure has high hardness and the second network structure has high extensibility.
- the strength of the hydrogel of the present disclosure is higher.
- the cross-linking degree in the second network structure is preferably smaller than the cross-linking degree in the first network structure.
- the degree of crosslinking in the second network structure is smaller than the degree of crosslinking in the first network structure, the first network structure has high hardness and the second network structure has high extensibility. As a result, the strength of the hydrogel of the present disclosure is further increased.
- the component amount of the first monomer in the hydrogel of the present disclosure is M1 (mol).
- the component amount of the second monomer in the hydrogel of the present disclosure is defined as M2 (mol).
- the molar ratio of M1 to M2 (hereinafter referred to as M1: M2) is preferably in the range of 1: 2 to 1: 100, more preferably in the range of 1: 3 to 1:50. Is particularly preferably in the range of 3 to 1:30.
- M1: M2 is in the above range, the mechanical strength of the hydrogel of the present disclosure can be further improved.
- the water content of the hydrogel of the present disclosure is preferably 10 to 99.9%.
- the compressive breaking stress of the hydrogel of the present disclosure is preferably 1 to 100 MPa.
- the tensile fracture stress of the hydrogel of the present disclosure is preferably 0.1 to 100 MPa.
- hydrogel of the present disclosure include, for example, artificial cartilage, artificial joints, artificial organs, cell culture substrates, drug delivery systems (DDS), contact lenses, intraocular lenses, hollow fibers, drug carriers, specific substances Soft actuators used for the tips of sensors or catheters, bedsore / decubitus mats, cushions, lubricants, stabilizers and thickeners such as lotions, fuel cell materials, battery separators, diapers, hygiene products, sustained release agents Civil engineering materials and building materials.
- the artificial organ include artificial blood vessels and artificial skin.
- a 1st network structure is formed.
- the first network structure can be formed as follows, for example. A first polymerization solution containing a first monomer, a first crosslinking agent and a polymerization initiator is prepared. Next, a 1st network structure is formed by superposing
- the second network structure can be formed as follows, for example.
- a second polymerization solution containing a second monomer, a second crosslinking agent, and a polymerization initiator is prepared.
- the gel having the first network structure is immersed in the second polymerization solution and stored in the immersed state.
- the second monomer and the second crosslinking agent are introduced into the first network structure, and diffuse and penetrate.
- the gel having the first network structure is taken out from the second polymerization solution.
- the second monomer introduced into the first network structure is polymerized and crosslinked with a second crosslinking agent. As a result, a second network structure intertwined with the first network structure is formed.
- the first cross-linking agent and the second cross-linking agent used in the hydrogel production method of the present disclosure are those described in the section “1. Hydrogel”. For this reason, the hydrogel produced by the hydrogel production method of the present disclosure is less susceptible to hydrolysis at the crosslinking point even under acidic conditions. As a result of the hydrolysis of the crosslinking points being difficult to occur even under acidic conditions, the hydrogel produced by the method for producing a hydrogel of the present disclosure is less likely to decrease in elastic modulus and strength even under acidic conditions.
- the polymerization initiator contained in the first polymerization solution and the second polymerization solution is not particularly limited, and can be appropriately selected according to the type of monomer.
- a water-soluble thermal catalyst such as potassium persulfate
- a redox initiator such as potassium persulfate-sodium thiosulfate, azobisisobutyronitrile (AIBN), benzoyl peroxide (BPO) or the like
- AIBN azobisisobutyronitrile
- BPO benzoyl peroxide
- the monomer is photopolymerized, for example, 2-oxoglutaric acid, benzophenone, hydrogen peroxide water, or the like can be used as a polymerization initiator.
- the solvent in the first polymerization solution and the second polymerization solution is not particularly limited and can be appropriately selected.
- the solvent include water, an organic solvent, a mixed solvent of water and an organic solvent, and the like.
- the organic solvent include dimethyl sulfoxide, 2-methyl-2-propanol, tetrahydrofuran and the like.
- the solvent in the first polymerization solution and the solvent in the second polymerization solution are preferably the same. When the solvent in the first polymerization solution and the solvent in the second polymerization solution are the same, the first network structure and the second network structure are more easily entangled.
- Examples of the method for polymerizing the first monomer include thermal polymerization and photopolymerization. Examples of light used in photopolymerization include ultraviolet rays. Examples of the method of crosslinking the polymer formed from the first monomer with the first crosslinking agent include thermal crosslinking and photocrosslinking. Examples of light used for photocrosslinking include ultraviolet rays.
- the polymerization of the first monomer and the crosslinking using the first crosslinking agent may be performed simultaneously, or may be performed after the polymerization.
- Examples of the method for polymerizing the second monomer include thermal polymerization and photopolymerization. Examples of light used in photopolymerization include ultraviolet rays. Examples of the method of crosslinking the polymer formed from the second monomer with the second crosslinking agent include thermal crosslinking and photocrosslinking. Examples of light used for photocrosslinking include ultraviolet rays.
- the polymerization of the second monomer and the crosslinking using the second crosslinking agent may be performed at the same time or may be performed after the polymerization.
- Example (3-1) Production of Hydrogel of Example 1 2-Acrylamido-2-methylpropanesulfonic acid (AMPS), divinylbenzene (DVB) and 2-oxoglutaric acid were added to a mixed solvent, One polymerization solution was prepared. The concentration of 2-acrylamido-2-methylpropanesulfonic acid in the first polymerization solution was 1 mol / L. The concentration of divinylbenzene in the first polymerization solution was 0.04 mol / L. The concentration of 2-oxoglutaric acid in the first polymerization solution was 0.01 mol / L.
- the mixed solvent was a mixed solvent of pure water and dimethyl sulfoxide (DMSO).
- 2-acrylamido-2-methylpropanesulfonic acid corresponds to the first monomer.
- Divinylbenzene corresponds to the first crosslinker.
- 2-Oxoglutaric acid corresponds to the polymerization initiator.
- the first polymerization solution was deoxygenated using nitrogen gas.
- the first polymerization solution was poured into a glass polymerization vessel.
- the first polymerization solution was irradiated with ultraviolet rays using a UV lamp.
- the wavelength of ultraviolet light was 365 nm.
- the output of the UV lamp was 22W.
- the output current of the UV lamp was 0.34A.
- the ultraviolet irradiation was performed at room temperature for 8 hours. At this time, 2-acrylamido-2-methylpropanesulfonic acid and divinylbenzene were polymerized, and divinylbenzene was cross-linked to form an AMPS gel.
- AMPS gel corresponds to the first network structure.
- N′N-dimethylacrylamide (DMAAm), divinylbenzene, and 2-oxoglutaric acid were added to the mixed solvent to prepare a second polymerization solution.
- concentration of N′N-dimethylacrylamide in the second polymerization solution was 2 mol / L.
- the concentration of divinylbenzene in the second polymerization solution was 0.002 mol / L.
- concentration of 2-oxoglutaric acid in the second polymerization solution was 0.005 mol / L.
- the mixed solvent was a mixed solvent of pure water and dimethyl sulfoxide.
- N'N-dimethylacrylamide corresponds to the second monomer.
- Divinylbenzene corresponds to the second crosslinker.
- 2-Oxoglutaric acid corresponds to the polymerization initiator.
- AMPS gel was immersed in the second polymerization solution.
- the second polymerization solution was introduced into the AMPS gel and diffused and penetrated.
- the AMPS gel in which the second polymerization solution has been diffused and penetrated is referred to as a diffusion / penetration gel.
- the diffusion / penetration gel was taken out from the second polymerization solution and cut into an appropriate size.
- the diffusion / penetration gel was irradiated with ultraviolet rays using a UV lamp.
- the wavelength of ultraviolet light was 365 nm.
- the output of the UV lamp was 22W.
- the output current of the UV lamp was 0.34A.
- the ultraviolet irradiation was performed at room temperature for 8 hours.
- N′N-dimethylacrylamide and divinylbenzene which are components of the second polymerization solution, were polymerized, and the divinylbenzene was crosslinked to form a second network structure.
- the second network structure was intertwined with the first network structure.
- the hydrogel was obtained by the above process.
- the obtained hydrogel was a double network gel in which the first network structure and the second network structure were independently formed.
- the obtained hydrogel was allowed to stand in pure water until equilibrium swelling was reached. Furthermore, it was washed with pure water until there were no unreacted monomers in the hydrogel.
- the first crosslinking agent and the second crosslinking agent in Example 2 were each a mixture of divinylbenzene and N, N′-methylenebisacrylamide (MBAA).
- N, N′-methylenebisacrylamide has an amide bond.
- An amide bond corresponds to a degradable bond.
- DVB / MBAA The molar ratio of divinylbenzene and N, N'-methylenebisacrylamide is hereinafter referred to as DVB / MBAA.
- DVB / MBAA in the first crosslinking agent and the second crosslinking agent in Example 2 was 75/25, respectively.
- the first crosslinking agent and the second crosslinking agent in Example 3 were each a mixture of divinylbenzene and N, N′-methylenebisacrylamide.
- DVB / MBAA in the first crosslinking agent and the second crosslinking agent in Example 3 was 50/50, respectively.
- the first crosslinking agent and the second crosslinking agent in Comparative Example 1 were each a mixture of divinylbenzene and N, N′-methylenebisacrylamide.
- DVB / MBAA in the first crosslinking agent and the second crosslinking agent in Comparative Example 1 was 25/75, respectively.
- the first crosslinking agent and the second crosslinking agent in Comparative Example 2 were only N, N′-methylenebisacrylamide, respectively.
- Table 1 shows the degree of crosslinking in the first network structure, the molar ratio of the crosslinking agent not containing degradable bonds in the first crosslinking agent, and the degree of crosslinking in the second network structure for Examples 1-4 and Comparative Examples 1 and 2. And the molar ratio of the crosslinking agent not containing degradable bonds in the second crosslinking agent and M1: M2 (molar ratio).
- Degree of cross-linking The ratio of the molar concentration of the cross-linking agent to the molar concentration of the monomer charged, expressed as a percentage.
- M1 M2 (molar ratio): molar ratio of charged amounts of the first monomer and the second monomer
- Specimens were cut out from the gel.
- the test body was sandwiched between compression test jigs of a testing machine and compressed at a predetermined compression speed.
- the compression test jig consists of two flat plates.
- the compression speed was a speed at which 10% of the thickness of the specimen was compressed in 1 minute.
- the compression breaking stress and the compression breaking strain were measured.
- the initial elastic modulus was calculated from the slope of the linear approximation in the initial strain portion of the stress-strain curve.
- Table 2 shows the measurement results of the compression rupture stress, compression rupture strain, and initial elastic modulus of the hydrogels of Example 1 and Comparative Examples 3 and 4.
- the hydrogel of Example 1 had significantly higher initial elastic modulus and compressive rupture stress than the single network hydrogels of Comparative Examples 3 and 4. From this result, it was confirmed that the hydrogel of Example 1 was a double network gel.
- Degree of swelling weight of swollen gel (WW) / weight of dry gel (WD)
- WW weight of swollen gel
- WD weight of dry gel
- the hydrogel of Example 1 had a smaller degree of swelling than the single network hydrogels of Comparative Examples 3 and 4.
- the elastic modulus is measured immediately after the production of the hydrogel.
- the elastic modulus at this time is E1.
- the hydrogel is immersed in an aqueous hydrochloric acid solution having a hydrochloric acid concentration of 0.05 mol / L and a pH of 1.3 at 25 ° C. for 24 hours. This immersion allows the aqueous hydrochloric acid solution to penetrate into the hydrogel.
- the hydrogel is immersed in an aqueous hydrochloric acid solution having a hydrochloric acid concentration of 0.05 mol / L and a temperature of 60 ° C. for T hours.
- T is in the range of 0-72.
- the hydrogel is taken out from the hydrochloric acid aqueous solution, and the elastic modulus of the hydrogel is measured.
- the elastic modulus of this time is E2 T.
- the initial elastic modulus ratio X T (%) defined by the following formula (3) is calculated.
- the relationship between the initial elastic modulus ratio XT and T in the hydrogels of Example 1 and Comparative Example 2 is shown in FIG.
- the hydrogel of Example 1 also increased T is the initial modulus ratio X T-tinged hardly lowered.
- the initial modulus ratio X T is significantly reduced.
- a function of one constituent element in each of the above embodiments may be shared by a plurality of constituent elements, or a function of a plurality of constituent elements may be exhibited by one constituent element. Moreover, you may abbreviate
- at least a part of the configuration of each of the above embodiments may be added to or replaced with the configuration of the other above embodiments.
- all the aspects included in the technical idea specified from the wording described in the claims are embodiments of the present disclosure.
- the present disclosure can be realized in various forms such as a product including the hydrogel as a constituent element.
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Abstract
Description
本開示のハイドロゲルは、第1網目構造と、第2網目構造とを備える。第2網目構造は、第1網目構造と絡み合っている。
(式(1)におけるE2は、塩酸濃度が0.05mol/Lであり、温度が60℃である塩酸水溶液に72時間浸漬する処理の後におけるハイドロゲルの弾性率。E1は、前記処理の前におけるハイドロゲルの弾性率。)
初期弾性率比Xが50%以上である場合、本開示のハイドロゲルは、酸性条件下でも、弾性率や強度が一層低下し難い。
本開示のハイドロゲルの製造方法では、第1網目構造を形成する。第1網目構造は、例えば、以下のように形成できる。第1モノマー、第1架橋剤及び重合開始剤を含む第1重合溶液を調製する。次に、第1モノマーを重合し、第1架橋剤により架橋することで、第1網目構造を形成する。
(3-1)実施例1のハイドロゲルの製造
2-アクリルアミド-2-メチルプロパンスルホン酸(AMPS)と、ジビニルベンゼン(DVB)と、2-オキソグルタル酸とを、混合溶媒に加え、第1重合溶液を調製した。第1重合溶液における2-アクリルアミド-2-メチルプロパンスルホン酸の濃度は1mol/Lであった。第1重合溶液におけるジビニルベンゼンの濃度は0.04mol/Lであった。第1重合溶液における2-オキソグルタル酸の濃度は0.01mol/Lであった。混合溶媒は、純水とジメチルスルホキシド(DMSO)との混合溶媒であった。
基本的には実施例1と同様にして、実施例2、3、及び比較例1、2のハイドロゲルを製造した。ただし、第1架橋剤及び第2架橋剤の種類において実施例1と相違する。なお、第1架橋剤の総モル数及び第2架橋剤の総モル数は、実施例1~3及び比較例1、2で同一である。
実施例1における第1重合溶液を用いて、比較例3のシングルネットワークハイドロゲルを製造した。比較例3のシングルネットワークハイドロゲルは、単一の網目構造を有していた。また、実施例1における第2重合溶液を用いて、比較例4のシングルネットワークハイドロゲルを製造した。比較例4のシングルネットワークハイドロゲルは、単一の網目構造を有していた。
実施例1のハイドロゲル、及び比較例3、4のシングルネットワークハイドロゲルについて、圧縮試験を行った。圧縮試験には、株式会社オリエンテック社製のテンシロン万能試験機を用いた。圧縮試験の方法は以下のとおりである。
実施例1のハイドロゲル、及び比較例3、4のシングルネットワークハイドロゲルについて、以下の式(2)により、膨潤度を求めた。求めた膨潤度を上記表1に示す。
実施例1のハイドロゲルは、比較例3、4のシングルネットワークハイドロゲルに比べて、膨潤度が小さかった。
実施例1~3及び比較例1、2のハイドロゲルについて、劣化試験を行った。劣化試験の方法は以下のとおりである。
初期弾性率比XTの測定結果を図1に示す。図1における「60℃×72hr後」は、Tが72時間である場合の初期弾性率比XTを表す。Tが72である場合の初期弾性率比XTは、初期弾性率比Xに対応する。
以上、本開示の実施形態について説明したが、本開示は上述の実施形態に限定されることなく、種々変形して実施することができる。
Claims (8)
- 第1網目構造と、
前記第1網目構造と絡み合った第2網目構造と、
を備えるハイドロゲルであって、
前記第1網目構造は、第1架橋剤により架橋したポリマーを含み、
前記第2網目構造は、第2架橋剤により架橋したポリマーを含み、
前記第1架橋剤のうち、50mol%以上は、分解性結合を含まず、
前記第2架橋剤のうち、50mol%以上は、分解性結合を含まないハイドロゲル。 - 請求項1に記載のハイドロゲルであって、
前記第1網目構造を構成する主鎖、及び前記第2網目構造を構成する主鎖は分解性結合を含まないハイドロゲル。 - 請求項1又は2に記載のハイドロゲルであって、
前記第1架橋剤及び前記第2架橋剤において、それぞれ独立して、前記分解性結合は、アミド結合、エステル結合、及びチオエステル結合から選ばれる1種以上を含むハイドロゲル。 - 請求項1~3のいずれか1項に記載のハイドロゲルであって、
前記分解性結合を含む前記第1架橋剤及び前記第2架橋剤は、それぞれ独立して、N,N′-メチレンビスアクリルアミド、及びエチレングリコールジメタクリレートの群から選ばれる1種以上を含むハイドロゲル。 - 請求項1~4のいずれか1項に記載のハイドロゲルであって、
前記分解性結合を含まない前記第1架橋剤及び前記第2架橋剤は、それぞれ独立して、ジビニルベンゼン、ジビニルピリジン、ジビニルビフェニル、及びジビニルスルホンの群から選ばれる1種以上を含むハイドロゲル。 - 請求項1~5のいずれか1項に記載のハイドロゲルであって、
以下の式(1)で定義される初期弾性率比Xが50%以上であるハイドロゲル。
式(1) X=(E2/E1)×100
(式(1)におけるE2は、塩酸濃度が0.05mol/Lであり、温度が60℃である塩酸水溶液に72時間浸漬する処理の後における前記ハイドロゲルの弾性率。E1は、前記処理の前における前記ハイドロゲルの弾性率。) - 第1モノマーを重合し、第1架橋剤により架橋することで、第1網目構造を形成し、
前記第1網目構造中に、第2モノマー及び第2架橋剤を導入し、
前記第2モノマーを重合し、前記第2架橋剤により架橋することで、前記第1網目構造と絡み合った第2網目構造を形成し、
前記第1架橋剤のうち、50mol%以上は、分解性結合を含まず、
前記第2架橋剤のうち、50mol%以上は、分解性結合を含まないハイドロゲルの製造方法。 - 請求項7に記載のハイドロゲルの製造方法であって、
前記第1架橋剤及び前記第2架橋剤において、それぞれ独立して、前記分解性結合は、アミド結合、エステル結合、及びチオエステル結合の群から選ばれる1種以上を含むハイドロゲルの製造方法。
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