CN107759732B - Acryloyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymer hydrogel and preparation method thereof - Google Patents
Acryloyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymer hydrogel and preparation method thereof Download PDFInfo
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Abstract
The invention discloses acryloyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymer hydrogel and a preparation method thereof. The high-strength supermolecule hydrogel disclosed by the invention has the advantages that due to the synergistic effect of hydrogen bonds, the preparation method is simple, the gel has strong tensile and compressive properties, the self-repairing and thermoplastic functions can be realized at a high temperature, and the high-strength supermolecule hydrogel has good electric conductivity and good biocompatibility.
Description
Technical Field
The invention belongs to the direction of hydrogel in the field of biotechnology, and particularly relates to hydrogel taking acryloyl glycinamide as a matrix and a preparation method thereof.
Background
The conductive hydrogel is a functional material formed by combining a conductive polymer and the hydrogel, and has the soft and wet characteristics of the hydrogel and a conductive function. Therefore, the conductive hydrogel has wide application in the fields of supercapacitors, fuel cells, lithium batteries, biosensors and the like. However, the mechanical properties of the conductive hydrogel are poor, and the conductive hydrogel is mainly characterized by weak and brittle properties. In addition, the preparation process of the conductive hydrogel is often complicated in order to combine the hydrogel conductive polymers with each other. Therefore, the above problems greatly limit the application of the conductive hydrogel in the fields of biomedicine, electrochemistry and the like.
At present, the high-strength conductive hydrogel mainly comprises two types of composite conductive hydrogel and double-network conductive hydrogel. The composite conductive hydrogel is formed by adding conductive nano materials such as conductive nano fibers, carbon nano tubes, graphene and the like into a network structure of the hydrogel to enhance the mechanical property of the conductive hydrogel. The double-network conductive hydrogel is formed by soaking hydrogel in a solution containing a conductive monomer, and initiating the conductive monomer to perform oxidative polymerization after the hydrogel is in swelling balance, so that the double-network conductive hydrogel is formed with a gel matrix. Although both composite and double-network conductive hydrogels can enhance the mechanical properties of the conductive hydrogels to some extent, both of these conductive hydrogels are cumbersome to prepare (Qu B, Li J, Xiao H, ethyl. factor preparation and characterization of a sodium alloy/graphical composite hydrogel [ J ]. Polymer Composites, 2015.). In addition, for the double-network conductive hydrogel, since most of the conductive polymer is insoluble in the solvent, it causes processing difficulty, and also causes the problem of non-uniform distribution of the conductive component in the gel matrix (Kishi R, Kubota K, Miura T, ethylene mechanical double-network hydrogels with high electronic conductivity [ J ]. Journal of Materials Chemistry C,2014,2(4):736 743.). Since the self-repairing property of the material is helpful to prolong the service life of the material, the preparation of conductive hydrogel with self-repairing property is also in constant favor of scholars. However, the preparation of high strength electrically conductive hydrogels with high self-healing efficiency remains a challenge.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides acryloyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymer hydrogel and a preparation method thereof, and the acryloyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymer hydrogel has the properties of high strength, self-repairing property, thermoplasticity, biocompatibility and conductivity.
The technical purpose of the invention is realized by the following technical scheme:
the acryloyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymerized hydrogel takes monomer acryloyl glycinamide and monomer 2-acrylamide-2-methylpropanesulfonic acid as comonomers, carbon-carbon double bonds on the two monomers are initiated by an initiator to carry out free radical polymerization, and the physical crosslinked hydrogel is formed by the synergistic effect of hydrogen bonds between double amide bonds existing in the side chain of the acryloyl glycinamide.
And the mass ratio of the two monomers acryloyl glycinamide and 2-acrylamide-2-methylpropanesulfonic acid is (15-50): 1, preferably (16-49): 1.
the preparation method of acryloyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymerized hydrogel comprises the steps of dissolving monomer acryloyl glycinamide and monomer 2-acrylamide-2-methylpropanesulfonic acid in a water phase condition, adding an initiator, and initiating carbon-carbon double bonds of the monomers by the initiator to carry out free radical polymerization under an anaerobic condition.
And the mass ratio of the two monomers acryloyl glycinamide and 2-acrylamide-2-methylpropanesulfonic acid is (15-50): 1, preferably (16-49): 1.
and the water phase is selected from deionized water or tap water.
Furthermore, the ratio of the sum of the masses of the two monomers to the mass of the aqueous phase is (1-1.5): 5.
and the amount of the initiator is 3 to 5 percent of the sum of the two monomers. In actual use, a two-component initiator can be selected according to the initiation effect, and the dosage of each component initiator is 3-5% of the mass sum of two monomers. The free radical provided by the initiator is used for initiating the reaction of the two monomers. Wherein the initiator can be selected from thermal initiator under water phase condition commonly used in polymer polymerization field, such as Ammonium Persulfate (APS), potassium persulfate (KPS), and tetramethylethylenediamine, or photoinitiator, such as 2-hydroxy-2-methyl-1-phenyl-1-acetone (Irgacure 1173). If a thermal initiator is selected, it is necessary to first exclude oxygen from the reaction system by using an inert gas (e.g., nitrogen, argon or helium) to avoid inhibition of polymerization, and then, depending on the activity and amount of the initiator, to heat the reaction system to a temperature above the initiation temperature of the initiator used and for a considerable period of time, e.g., 1 hour or more (e.g., 1 to 48 hours, preferably 20 to 40 hours), so as to allow the initiator to generate a sufficient number of radicals for a long period of time to initiate the reaction system for continuous radical polymerization, thereby finally preparing the hydrogel of the present invention. If a photoinitiator is selected, the photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone (Irgacure 1173). A transparent closed reaction container can be selected for initiating free radical polymerization under the condition of ultraviolet irradiation, and because the photoinitiation efficiency is higher than that of thermal initiation, when the irradiation time is adjusted according to the activity and the dosage of the selected initiator, the irradiation time can be shorter than the heating time of thermal initiation, such as 20 minutes or longer (30min-1h), and compared with the thermal initiation, the experimental time can be greatly reduced.
Further, the temperature for initiating the polymerization is 20 to 25 ℃ at room temperature, and the polymerization time is 24 to 30 hours.
In the preparation scheme, after the reaction is finished, the copolymer is taken out of the reaction container, and after the monomers, the initiator, the cross-linking agent and the solvent which do not participate in the reaction are removed, the copolymer is soaked in water until the swelling balance is achieved (for example, the copolymer is soaked for 7 days, and the water is replaced every 12 hours to achieve the swelling balance).
The high-strength supermolecule conductive hydrogel based on acryloyl glycinamide takes monomer acryloyl glycinamide and monomer 2-acrylamide-2-methylpropanesulfonic acid as comonomers, takes poly (3,4-ethylenedioxythiophene) -poly (styrenesulfonic acid) as a blending component, initiates carbon-carbon double bonds on the two monomers through an initiator to carry out free radical polymerization, and forms a physically crosslinked hydrogel through the synergistic effect of hydrogen bonds between double amide bonds carried by the side chain of the acryloyl glycinamide, so that the poly (3,4-ethylenedioxythiophene) -poly (styrenesulfonic acid) is doped in a gel network structure.
And the mass ratio of the two monomers acryloyl glycinamide and 2-acrylamide-2-methylpropanesulfonic acid is (15-50): 1, preferably (16-49): 1.
furthermore, poly (3,4-ethylenedioxythiophene) -poly (styrenesulfonic acid) is a dark blue aqueous solution, is commercially available, has a viscosity of 120000 to 180000mpa.s and a solid content of 1 to 5% (i.e., purity), and can be directly and uniformly mixed with the aqueous solution in which the monomer is dissolved.
The preparation method of the high-strength supermolecule conductive hydrogel based on the acryloyl glycinamide comprises the steps of dissolving monomer acryloyl glycinamide and monomer 2-acrylamide-2-methylpropanesulfonic acid under a water phase condition, uniformly mixing the monomer acryloyl glycinamide and monomer 2-acrylamide-2-methylpropanesulfonic acid with poly (3,4-ethylenedioxythiophene) -poly (styrenesulfonic acid), adding an initiator, initiating carbon-carbon double bonds of the monomer by the initiator under an anaerobic condition to carry out free radical polymerization, and doping the poly (3,4-ethylenedioxythiophene) -poly (styrenesulfonic acid) in a gel network structure.
And the mass ratio of the two monomers acryloyl glycinamide and 2-acrylamide-2-methylpropanesulfonic acid is (15-50): 1, preferably (16-49): 1.
and the water phase is selected from deionized water or tap water.
Furthermore, the ratio of the sum of the masses of the two monomers to the mass of the aqueous phase is (1-1.5): 5.
furthermore, poly (3,4-ethylenedioxythiophene) -poly (styrenesulfonic acid) is added in an amount of 1% to 10%, preferably 5% to 8%, by volume of the aqueous phase.
And the amount of the initiator is 3 to 5 percent of the sum of the two monomers. In actual use, a two-component initiator can be selected according to the initiation effect, and the dosage of each component initiator is 3-5% of the mass sum of two monomers. The free radical provided by the initiator is used for initiating the reaction of the two monomers. Wherein the initiator can be selected from thermal initiator under water phase condition commonly used in polymer polymerization field, such as Ammonium Persulfate (APS), potassium persulfate (KPS), and tetramethylethylenediamine, or photoinitiator, such as 2-hydroxy-2-methyl-1-phenyl-1-acetone (Irgacure 1173). If a thermal initiator is selected, it is necessary to first exclude oxygen from the reaction system by using an inert gas (e.g., nitrogen, argon or helium) to avoid inhibition of polymerization, and then, depending on the activity and amount of the initiator, to heat the reaction system to a temperature above the initiation temperature of the initiator used and for a considerable period of time, e.g., 1 hour or more (e.g., 1 to 48 hours, preferably 20 to 40 hours), so as to allow the initiator to generate a sufficient number of radicals for a long period of time to initiate the reaction system for continuous radical polymerization, thereby finally preparing the hydrogel of the present invention. If a photoinitiator is selected, the photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone (Irgacure 1173). A transparent closed reaction container can be selected for initiating free radical polymerization under the condition of ultraviolet irradiation, and because the photoinitiation efficiency is higher than that of thermal initiation, when the irradiation time is adjusted according to the activity and the dosage of the selected initiator, the irradiation time can be shorter than the heating time of thermal initiation, such as 20 minutes or longer (30min-1h), and compared with the thermal initiation, the experimental time can be greatly reduced.
Further, the temperature for initiating the polymerization is 20 to 25 ℃ at room temperature, and the polymerization time is 24 to 30 hours.
In the preparation scheme, after the reaction is finished, the copolymer is taken out of the reaction container, and after the monomers, the initiator, the cross-linking agent and the solvent which do not participate in the reaction are removed, the copolymer is soaked in water until the swelling balance is achieved (for example, the copolymer is soaked for 7 days, and the water is replaced every 12 hours to achieve the swelling balance).
After the poly (3,4-ethylenedioxythiophene) -poly (styrenesulfonic acid) is uniformly mixed with the two monomers, the unsaturated bonds of acryloyl glycinamide and 2-acrylamide-2-methylpropanesulfonic acid are initiated by an initiator to carry out free radical copolymerization, so that the poly (3,4-ethylenedioxythiophene) -poly (styrenesulfonic acid) is successfully doped into a gel three-dimensional network structure. After the conductive hydrogel doped with poly (3,4-ethylenedioxythiophene) -poly (styrenesulfonic acid) with different volumes reaches swelling equilibrium in a neutral buffer solution (pH 7.4), the conductivity of the conductive hydrogel can reach 0.749S/m-2.212S/m on average.
The application of the supramolecular complex hydrogel based on the acryloyl glycinamide in 3D printing is acryloyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymer hydrogel or high-strength supramolecular conductive hydrogel based on the acryloyl glycinamide (namely, acryloyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymer hydrogel doped in situ by using poly (3,4-ethylenedioxythiophene) -poly (styrenesulfonic acid)).
In the technical scheme of the invention, intermolecular hydrogen bonds formed after copolymerization of acryloyl glycinamide and 2-acrylamide-2-methylpropanesulfonic acid can be destroyed and recombined at high temperature, so that the two gels show self-repairing property and thermoplasticity. After the prepared hydrogel reaches swelling equilibrium in a neutral buffer solution (pH 7.4), the self-repairing of the conductive gel can be realized at 80-90 ℃.
The two prepared hydrogels (acryloyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymer hydrogel or high-strength supramolecular conductive hydrogel based on acryloyl glycinamide) can realize the conversion from gel to sol at 80-90 ℃ after reaching the swelling balance in deionized water, can be reshaped after the sol is placed at the room temperature of 20-25 ℃ and is cooled, and can be printed into gel with a certain shape by using a 3D printer (namely, the sol is used as a raw material for printing by using the 3D printer and then is naturally cooled to the room temperature to realize gelation). Adding activated carbon into the two kinds of hydrogel in the sol state, uniformly mixing, printing by using a 3D printer, and naturally cooling to room temperature to realize gelation. The amount of activated carbon is 1-10%, preferably 5-8% by mass of the hydrogel.
Compared with the prior art, the high-strength supermolecule hydrogel provided by the invention is prepared by taking acryloyl glycinamide and 2-acrylamide-2-methylpropanesulfonic acid as raw materials and initiating ammonium persulfate and tetramethylethylenediamine, and due to the synergistic effect of hydrogen bonds, the gel is simple in preparation method, has strong tensile and compressive properties, can realize self-repairing and thermoplastic functions at a high temperature, and has good conductivity and biocompatibility. After the poly (3,4-ethylenedioxythiophene) -poly (styrenesulfonic acid) is doped, the overall performance is not reduced, better conductivity is shown, and excellent performance for 3D printing is shown.
Drawings
FIG. 1 is a schematic diagram of the structure of monomeric acryloyl glycinamide (NAGA) used in the present invention.
FIG. 2 is a chart of NMR spectra of acrylglycinamide/2-acrylamido-2-methylpropanesulfonic acid copolymerized hydrogel prepared in the present invention.
FIG. 3 is a thermal electric DXR laser micro-Raman spectrum of acryloyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymer hydrogel (undoped, curve 1) and doped acryloyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymer hydrogel (curve 2) prepared in the present invention.
FIG. 4 is a graph showing the effect of shape change of acryloyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymerized hydrogel (undoped) prepared in the present invention, wherein A represents stretching, B represents compression, C represents entanglement, and D represents knotting.
FIG. 5 is a graph showing the effect of shape change of a doped acrylglycinamide/2-acrylamido-2-methylpropanesulfonic acid copolymer hydrogel according to the present invention, wherein A represents elongation, B represents compression, C represents entanglement, and D represents knotting.
FIG. 6 is a schematic representation of the self-healing of acryloyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymeric hydrogel (undoped) prepared in the present invention, wherein a represents the cutting of the gel with a scalpel; b represents that the cut gel realizes self-repairing at 90 ℃; c represents that the gel after self-repairing can be stretched; d represents that the gel after self-healing can bend.
FIG. 7 is a schematic representation of the self-healing of a doped acryloyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymer hydrogel of the present invention, wherein a represents cutting the gel with a scalpel; b represents that the cut gel realizes self-repairing at 90 ℃; c represents that the gel after self-repairing can be stretched; d represents that the gel after self-healing can bend.
Fig. 8 is a photograph of a gel printed in the shape of TJU using a 3D printer after the hydrogel prepared using the present invention reached its swelling equilibrium in deionized water.
Fig. 9 is a photograph of a hydrogel prepared according to the present invention, which was mixed with activated carbon after reaching a swelling equilibrium in deionized water and then achieving a gel-sol transition at 90c, and then printed again with a 3D printer to have a shape of TJU.
Detailed Description
The technical scheme of the invention is further explained by combining specific examples. In the embodiment of the invention, medicines and instruments are conventional medicines and equipment which are commercially available or used in laboratories, monomer acryloyl glycinamide takes glycinamide hydrochloride and acryloyl chloride as raw materials, and the monomer acryloyl glycinamide (NAGA) with two amide groups is prepared according to a reference document (Bousta M, Colombo P E, Lenglet S, et. Versatile UCST-based thermoresistive hydrogels for co-regionally consumed drug delivery [ J ]. Journal of Controlled Release,2014,174:1-6), and the structure is determined by nuclear magnetism and infrared rays and is shown in figure 1, which is not repeated herein.
EXAMPLE 1 preparation of Acrylylglycinamide/2-acrylamido-2-methylpropanesulfonic acid copolymerized hydrogel
196mg of acryloyl glycinamide and 4mg of 2-acrylamido-2-methylpropanesulfonic acid were dissolved in 1000. mu.L of deionized water, then 6mg of ammonium persulfate was added and dissolved, and finally 6. mu.L of tetramethylethylenediamine was added. The mixture was poured into a closed mold and maintained for 24 hours to ensure sufficient initiation of polymerization. The gel was then removed by opening the mold and allowed to soak in neutral buffer PBS (pH 7.4) or deionized water to reach swelling equilibrium (e.g., water was changed every 12h for 7 days to reach swelling equilibrium). Acryloyl glycinamide is a monomer with a bisamide bond on a side chain, and can form physically crosslinked hydrogel by utilizing the synergistic effect of hydrogen bonds between the bisamide bonds of the side chain when the acryloyl glycinamide is subjected to free radical copolymerization with 2-acrylamide-2-methylpropanesulfonic acid. Using NMR spectra of hydrogen (b)1H NMR,500MHz) demonstrated that copolymerization of the two monomers was achieved (PNAGA-co-PAMPS), as detailed in figure 2 of the specification.
1H NMR spectrum (NMR spectrum) is obtained by using deuterated water (D)2O, also called: deuterium oxide; deuterium oxide water; deuterium) as a deuterated reagent, a copolymer sample was dissolved in the deuterated reagent, and the resulting solution was analyzed by a 500MHz liquid nuclear magnetic resonance spectrometer (model: VarianinOVA, Warrian, USA) for detection. Deuterium oxide (D)2O) the specification is as follows: CAS number: 7789-20-0; the manufacturer: french CIL (agent: Shanghai Baili Biotech Co., Ltd.); the vendor of the deuterated reagent: hengsi Ruicho Co., Ltd, Beijing. The sequence of a, b, c, d and e in the spectrogram is marked from right to left in turn: chemical shift δ 1.7ppm (H)a,-CH3)；δ＝1.8–2.1ppm(Hb,-CH2-)；δ＝2.4–2.6ppm(Hc,-CH-)；δ＝3.3ppm(Hd,-CH2-SO3H)；δ＝4.1–4.4ppm(He,-NH-CH2-CONH2) From the above analysis it can be shown that copolymerization of the two monomers is achieved.
EXAMPLE 2 preparation of Acryloylglycinamide/2-acrylamido-2-methylpropanesulfonic acid copolymer hydrogel in doped form
196mg of acryloyl glycinamide and 4mg of 2-acrylamido-2-methylpropanesulfonic acid were dissolved in 1000. mu.L of deionized water, and 30. mu.L of poly (3,4-ethylenedioxythiophene) -poly (styrenesulfonic acid) were added. 6mg of ammonium persulfate was then added and dissolved, and finally 6. mu.L of tetramethylethylenediamine was added. The mixture was poured into a closed mold and maintained for 24 hours to ensure sufficient initiation of polymerization. The gel was then removed by opening the mold and allowed to soak in neutral buffer PBS (pH 7.4) or deionized water to reach swelling equilibrium (e.g., water was changed every 12h for 7 days to reach swelling equilibrium). Acryloyl glycinamide is a monomer with a bisamide bond on a side chain, and can form physically crosslinked hydrogel by utilizing the synergistic effect of hydrogen bonds between the bisamide bonds of the side chain when the acryloyl glycinamide is subjected to free radical copolymerization with 2-acrylamide-2-methylpropanesulfonic acid.
Poly (3,4-ethylenedioxythiophene) -poly (styrenesulfonic acid) CAS No.: 155090-83-8, Poly (3, 4-ethylenedioxythiopene) -Poly (styrene sulfonate), vendor: tianjin Xiansi Oppon technology, Ltd., purity: 1.3 wt.% (purity: 1.3 wt.% dispersion in H2O). The poly (3,4-ethylenedioxythiophene) -poly (styrenesulfonic acid) is a dark blue aqueous solution, has the mass fraction of 1.3%, has high conductivity, can be directly and uniformly mixed with the aqueous solution dissolved with a monomer, and is successfully doped into a gel three-dimensional network structure by initiating the free radical copolymerization of unsaturated bonds of acryloyl glycinamide and 2-acrylamide-2-methylpropanesulfonic acid by an initiator.
The hydrogel before and after doping was characterized by a pyroelectric DXR laser micro-Raman spectrometer (English name: ThermoFisher DXR Raman spectrometer), the excitation wavelength was fixed at 532 nm, and the sample was tested as a powder, as shown in FIG. 3. The mass ratio (NAGA/AMPS) of the two monomers is 24, the content of doped poly (3,4-ethylenedioxythiophene) -poly (styrenesulfonic acid) is 5 percent, and PNAGA-PAMPS/PEDOT/PSS-0-24 is adopted before doping and PNAGA-PAMPS/PEDOT/PSS-5-24 is adopted after doping according to the nomenclature in the text. In the figure, the distance is 990cm-1The absorption peak is deformation vibration of an ethylene oxide ring on a thiophene ring in PEDOT/PSS, and is located at 1365cm-1The absorption peak at is thiophene ring Cα-CαStretching and vibrating at 1519cm-1The absorption peak is C in the thiophene ringβ-CβAt 1443cm-1The absorption peak is C in the thiophene ringα＝CβThe stretching vibration of (2). According to the spectrogram, the characteristic absorption peak of PEDOT/PSS appears after the gel is doped with PEDOT/PSS, so that the fact that the gel is successfully doped with the PEDOT/PSS can be proved.
Example 3 mechanical Property testing
The mechanical properties of the two hydrogels prepared above were tested using the following method. The mechanical property test was performed on an electronic universal tester (the knan times limited), and the hydrogel before the test reached a swelling equilibrium in a neutral PBS buffer solution (pH 7.4). The sample for testing the tensile mechanical property has the size of 20mm multiplied by 10mm, the thickness of 500 mu m and the tensile rate of 50 mm/min; the sample size for compression mechanical property test is a cylinder with the diameter of 10mm and the height of 8mm, and the compression rate is 10 mm/min. The tensile strength and the compressive strength of the hydrogel before and after doping can reach the MPa level; in addition, in order to express the mechanical properties more vividly, the two gels were subjected to stretching, compressing, winding and knotting treatments.
The prepared acrylylglycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymer hydrogel (undoped) was subjected to shape change and photographed as shown in fig. 4, wherein a represents tension, B represents compression, C represents entanglement, and D represents knotting, all showing excellent shape change properties. The prepared acrylylglycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymer hydrogel (undoped) was subjected to shape change and photographed as shown in fig. 5, wherein a represents tension, B represents compression, C represents entanglement, and D represents knotting, all showed excellent shape change properties, substantially in accordance with the shape change properties in the undoped state.
EXAMPLE 4 self-healing Properties
The self-healing properties of two hydrogels of the present invention were tested using the following method. The hydrogel before the test was in a neutral buffer solution (pH 7.4) to reach swelling equilibrium. The prepared conductive hydrogel was cut in half, then the two halves of the gel were placed on top and in full contact, and heated in a sealed container at a temperature of 90 ℃ for 3 hours, and finally the cut gels were well bonded together and no interface was visible. As shown in fig. 6 and 7, both hydrogels (undoped and doped) exhibited substantially consistent properties and states, i.e., the hydrogels achieved self-healing and maintained good mechanical and deformability (stretching and bending) after healing.
EXAMPLE 5 conductivity
The electrical conductivity of the hydrogel was tested as follows. The electrical properties were tested on an electrochemical workstation (new zealand PGSTAT302N type electrochemical workstation) using the cross-linked impedance method, and the conductive hydrogel before the test reached the swelling equilibrium in a neutral buffer solution (pH 7.4). The sample size for electrical property testing was a small disc 10mm in diameter and 1mm in height.
Example 6 cytotoxicity
The cytotoxicity of different hydrogels was tested using the following method in order to test the possibility of hydrogel application to biomaterials. Gel pieces of various ratios were sterilized by soaking in 75% ethanol for 2h, then washed with PBS (pH 7.4) buffer solution, and the conductive gel was placed on the bottom of 48-well plates. Mouse fibroblasts were seeded in the above 48-well plate and cultured for 48 hours. The original medium was then changed to medium containing blue thiazolium (MTT) at 37 ℃ and 5% CO2Incubate for 4 hours at ambient. Finally, 300 mu L of dimethyl sulfoxide is used for dissolving the bluish purple crystals, after slight oscillation for 15min, the cell survival rate is detected to reach more than 70% by using excitation light with 490nm, no obvious cytotoxicity is found, and the experimental result shows that the gel doped in front and back has good biocompatibility.
Example 7 thermoplastic Properties and 3D printing
The thermoplasticity of both hydrogels of the present invention was examined using the following method. A sample of the prepared PNAGA-PAMPS/PEDOT/PSS-10-24 gel was first placed in deionized water to reach swelling equilibrium. Then heating at 90 deg.C to convert the gel into a fluid sol, printing into TJU sample by 3D printer, cooling at 20-25 deg.C, and gelatinizing again as shown in FIG. 8.
In order to further fully exert the thermoplasticity of the conductive hydrogel, a prepared PNAGA-PAMPS/PEDOT/PSS-10-24 gel sample is placed in deionized water to achieve swelling equilibrium, the gel is heated at 90 ℃ to be converted into a flowing sol, then activated carbon with electrochemical activity is added into the sol, the mass fraction of the activated carbon is 10%, the activated carbon is uniformly mixed and printed into a TJU-shaped sample by a 3D printer, and the sample can be gelled again after being placed at room temperature and cooled, as shown in the attached figure 9. Using the hydrogel PNAGA-PAMPS/PEDOT/PSS-0-24, a TJU shaped sample was prepared in accordance with FIG. 9 by blending with activated carbon and printing 3 as described above.
The gel sample was named PNAGA-PAMPS/PEDOT/PSS-X-Y, where PNAGA-PAMPS represents a copolymer of two monomers, acryloyl glycinamide (NAGA) and 2-acrylamide-2-methylpropanesulfonic Acid (AMPS), X represents the volume fraction of doped poly (3,4-ethylenedioxythiophene) -poly (styrenesulfonic acid), and Y represents the mass ratio of acryloyl glycinamide (NAGA) and 2-acrylamide-2-methylpropanesulfonic Acid (AMPS).
The following table shows the various performance parameters of the hydrogel samples:
compressive strength: when measuring, the gel cannot be compressed until the maximum range of the machine, so the stress at 90% strain is used as the strength.
The hydrogel was prepared by adjusting the process parameters as described in the summary of the invention section, and the hydrogel before and after doping exhibited properties substantially identical to those of the examples. The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (9)
1. The acryloyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymerized hydrogel is characterized in that a monomer acryloyl glycinamide and a monomer 2-acrylamide-2-methylpropanesulfonic acid are used as comonomers, carbon-carbon double bonds on the two monomers are initiated by an initiator to carry out free radical polymerization, and a physically crosslinked hydrogel is formed by the synergistic effect of hydrogen bonds between double amide bonds on the side chain of the acryloyl glycinamide, wherein the mass ratio of the two monomers of the acryloyl glycinamide to the 2-acrylamide-2-methylpropanesulfonic acid is (15-50): 1.
2. the acrylglycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymer hydrogel according to claim 1, wherein the mass ratio of two monomers, acrylglycinamide and 2-acrylamide-2-methylpropanesulfonic acid, is (16 to 49): 1.
3. the preparation method of the acryloyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymer hydrogel is characterized in that monomer acryloyl glycinamide and monomer 2-acrylamide-2-methylpropanesulfonic acid are dissolved under the water phase condition, an initiator is added, the carbon-carbon double bond of the monomer is initiated by the initiator under the anaerobic condition for free radical polymerization, and the mass ratio of the two monomers of the acryloyl glycinamide to the 2-acrylamide-2-methylpropanesulfonic acid is (15-50): 1, the ratio of the sum of the masses of the two monomers to the mass of the aqueous phase is (1-1.5): 5.
4. the method for preparing acrylglycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymerized hydrogel according to claim 3, wherein the mass ratio of the two monomers, acrylglycinamide and 2-acrylamide-2-methylpropanesulfonic acid, is (16 to 49): 1.
5. the method of claim 3, wherein the aqueous phase is selected from deionized water or tap water.
6. The method for preparing acrylyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymerized hydrogel according to claim 3, characterized in that the amount of the initiator is 3% -5% of the sum of the two monomers; selecting a two-component initiator, wherein the using amount of each component initiator is 3% -5% of the mass sum of the two monomers.
7. The method for preparing acrylglycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymerized hydrogel according to claim 3, wherein the polymerization initiation temperature is from 20 to 25 ℃ and the polymerization reaction time is from 24 to 30 hours.
8. Use of acryloyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymerized hydrogel according to claim 1 as a self-healing material.
9. Use of acryloyl glycinamide/2-acrylamide-2-methylpropanesulfonic acid copolymerized hydrogel according to claim 1 as biomaterial.
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