A class of transparent porous hydrogels of bisphenol a type and a method for preparing the same
By combining "amino-epoxy" click polymerization reaction and chemical crosslinking agent, a transparent porous hydrogel was prepared, which solved the problems of uneven pore size and poor transparency, achieved a hydrogel with high transparency and good mechanical properties, and broadened its application field.
Patent Information
- Application Number
- CN202510125821.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-27
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2045-01-27
AI Technical Summary
Existing methods for preparing porous hydrogels have problems such as uneven pore size and poor transparency, which limits their application in flexible electronic devices, pollution control, and biomedicine.
Bisphenol A diglycidyl ether and polyethylene glycol glycidyl ether were copolymerized through the "amino-epoxy" click polymerization reaction. The thermodynamic incompatibility of rigid and flexible chain segments was utilized to form microphase separation, and transparent porous hydrogels were prepared by combining isocyanate chemical crosslinkers.
The preparation of porous hydrogels with high transparency and excellent mechanical properties has expanded their application potential in flexible electronic devices, pollution control, biomedicine and other fields, and alleviated the market pressure on bisphenol A.
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Figure CN119875062B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of polymer material preparation, and relates to a bisphenol A type transparent porous hydrogel and a preparation method thereof. Background Art
[0002] In recent years, the domestic bisphenol A market has entered a new stage of development. The mismatch between the continued expansion of domestic supply and market demand has led to a continuous decline in product prices and increased industry losses. Bisphenol A diglycidyl ether is not only a major downstream product of bisphenol A but also the most commonly used epoxy resin in industry. Its mature preparation process and low price have made it a popular choice among researchers and are commonly used in coatings, adhesives, molding materials, and other fields. Faced with the current oversupply of domestically produced bisphenol A, finding new applications will undoubtedly alleviate market pressure on the domestic bisphenol A market. Hydrogels, as an important soft material, are attracting increasing attention in fields such as flexible electronics, pollution control, and biomedicine. The application of bisphenol A diglycidyl ether in the hydrogel field not only expands hydrogel preparation methods but also alleviates market supply pressure on bisphenol A, thus possessing great research value.
[0003] Compared to conventional hydrogels, porous hydrogels possess a stronger water absorption capacity, rapidly absorbing water through capillary action and increasing the contact area between hydrophilic groups and water molecules. These methods demonstrate significant potential for a variety of applications. Common methods for producing porous hydrogels include templating, foaming, and phase separation. The templating method involves using a template substance to create voids within the hydrogel, which is then removed to form a porous structure. However, porous materials produced using the templating method generally exhibit poor mechanical properties and a single pore size, making large-scale production difficult due to the sacrifice of the template material. The foaming method utilizes the high-temperature decomposition of chemicals to generate gases, which form bubbles during the polymerization process. These bubbles expand, leaving pores in the polymer, resulting in a porous polymer structure. In addition to chemical reactions, mechanical agitation can also be used to generate bubbles to produce porous hydrogels. However, porous materials produced using chemical foaming or mechanical agitation typically have a wide pore size distribution, ranging from a few microns to several hundred microns. Phase separation method has obvious advantages such as simplicity, easy operation and low cost compared with other methods. The porous polymer network prepared by this method is mostly connected by covalent bonds and has high mechanical properties. However, phase separation method is often limited by the type of polymerization monomer and the special properties of the polymer and cannot be widely used. The hydrogels prepared by these common porous hydrogel preparation methods have larger pore size or uneven pore distribution, and are mostly opaque, which limits the application of hydrogels to a certain extent. Therefore, it is very necessary to develop a new method to achieve the consumption of bisphenol A diglycidyl ether and the transparency of porous hydrogel. Summary of the Invention
[0004] To address the problems of the prior art, the present invention provides a type of bisphenol A-based transparent porous hydrogel and its preparation method. The present invention copolymerizes bisphenol A diglycidyl ether with polyethylene glycol glycidyl ether, and utilizes the thermodynamic incompatibility between the rigid segments produced by the copolymerization of bisphenol A diglycidyl ether and the flexible segments produced by the polyethylene glycol glycidyl ether to prepare a microphase-separated hydrogel. By adjusting the ratio and amount of the various raw materials, the porosity is controlled and high transparency is achieved. The purpose of the present invention is to prepare a novel highly transparent hydrogel and thereby reduce the consumption of bisphenol A products, thereby helping to alleviate the market pressure on bisphenol A.
[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:
[0006] A type of bisphenol A-based transparent porous hydrogel is prepared based on a simple and efficient "amino-epoxy" click reaction. Bisphenol A diglycidyl ether and polyethylene glycol glycidyl ether at different feed ratios are polymerized with different amino monomers to form a polyhydroxy prepolymer. Isocyanate-based chemical crosslinkers of varying feed ratios and structures are then added to react with the hydroxyl groups to form a crosslinked polymer network. The crosslinked polymer network is then immersed in water. The thermodynamic incompatibility of the rigid bisphenol A segments and the flexible polyethylene glycol segments in the copolymerization results in a microphase-separated porous structure, which facilitates the hydrogel's water absorption process.
[0007] The structural formula of the bisphenol A diglycidyl ether is as follows:
[0008]
[0009] The structural formula of the polyethylene glycol glycidyl ether (Mn=500-6000 g / mol) is as follows:
[0010]
[0011] The amino monomers include 3-amino-1-propanol, 6-amino-1-hexanol, 2-amino-1-butanol, N,N'-dimethylhexanediamine, and N,N'-dimethyl-1,3-propylenediamine, and the structural formulas are as follows:
[0012]
[0013] Furthermore, the chemical crosslinking agent includes hexamethylene diisocyanate (HDI), diphenylmethane diisocyanate (MDI), and dicyclohexylmethane diisocyanate (HMDI), and the structural formulas of each are as follows:
[0014]
[0015] The microphase separation refers to the fact that the structural difference between the rigid segments and the flexible segments after the copolymerization of bisphenol A diglycidyl ether and polyethylene glycol glycidyl ether is large, and they cannot be evenly dispersed at the molecular level. Since it is not a completely thermodynamically stable system, phase separation occurs. This phase separation does not appear to be a macroscopic stratification phenomenon in appearance, but the existence of two phases can be observed with the help of high-resolution means.
[0016] A method for preparing a bisphenol A type transparent porous hydrogel comprises the following steps:
[0017] In the first step, the polyhydroxy prepolymer PBAPEG was prepared by "amino-epoxy" click polymerization under inert gas protection.
[0018] First, bisphenol A diglycidyl ether and polyethylene glycol glycidyl ether are thoroughly dissolved in 15-30 ml of an organic solvent. Then, the amino monomer is added and stirred to obtain a mixed solution. The solution is then stirred in an oil bath at 60-140°C for 6-14 hours. After the reaction is complete, the heat is turned off while stirring is continued and the system is allowed to cool naturally to obtain a linear prepolymer solution containing the polyhydroxy prepolymer PBAPEG.
[0019] Furthermore, the organic solvent includes N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), and tetrahydrofuran (THF).
[0020] Furthermore, the molar ratio of bisphenol A diglycidyl ether to polyethylene glycol glycidyl ether is 1:(0.25-4), wherein the concentration of bisphenol A diglycidyl ether in the mixed solution is 0.133-0.533 mol / L; and the amount of the amino monomer is 0.75-0.95 times the total molar amount of the bisphenol A diglycidyl ether and polyethylene glycol glycidyl ether epoxy monomer.
[0021] In the second step, a cross-linked polymer network PBAPEGPU is generated by reacting a chemical cross-linking agent with the polyhydroxy prepolymer PBAPEG.
[0022] First, a chemical crosslinker is added to the linear prepolymer solution, stirred thoroughly, and then transferred to a horizontally placed mold in an oven. Next, a vacuum pump is turned on to maintain negative pressure in the oven until no bubbles are noticeable in the solution. The vent valve is then opened to return the oven to atmospheric pressure. Finally, the oven temperature is set to 40-70°C. After 36-48 hours, the polymer is observed to transition from a liquid to a solid state. The solution is then transferred to a fume hood, where the solvent evaporates completely to yield the elastomeric crosslinked polymer, PBAPEGPU.
[0023] Furthermore, the molar ratio of the cross-linking agent to the amino monomer is (0.3-0.75):1.
[0024] Furthermore, the stirring time is 5-15 minutes.
[0025] Furthermore, the chemical cross-linking agent is diluted with 2-4 ml of an organic solvent and then added dropwise to the linear prepolymer solution.
[0026] The third step is to obtain the transparent porous hydrogel WPBAPEGPU by immersion method.
[0027] The cross-linked polymer network PBAPEGPU was immersed in water for 10-30 min to obtain a transparent porous hydrogel WPBAPEGPU.
[0028] Experimental tests of the present invention:
[0029] (1) Characterization of thermal properties of cross-linked polymer network PBAPEGPU: Differential scanning calorimetry data were obtained using a TA Instruments-Q2000 differential scanning calorimeter. The test conditions were heating or cooling at a rate of 10°C / min in the temperature range of -70°C to 70°C. Before the formal test, the material was given a heating rate of 10°C / min to remove the thermal history.
[0030] (2) Tensile test of cross-linked polymer network PBAPEGPU: Instron 5567A material testing machine was used to perform tensile test at a rate of 5 mm / min at room temperature.
[0031] (3) Characterization of the micromorphology of the cross-linked polymer network PBAPEGPU: The micromorphology was measured using a HITACHI-SU5000 field emission electron microscope.
[0032] (4) Hydrogel WPBAPEGPU water absorption swelling test and swelling rate calculation method:
[0033] The cross-linked polymer network PBAPEGPU was placed in water until the weight change reached a stable state. The swelling ratio was calculated as shown in Formula 1: SR = (m2-m1) / m2*100% (Formula 1)
[0034] Where: SR - swelling ratio, m1 is the weight of the cross-linked polymer network PBAPEGPU before swelling due to water absorption, and m2 is the weight of the hydrogel WPBAPEGPU after swelling due to water absorption.
[0035] (5) Transparency test: The transparency of the cross-linked polymer network PBAPEGPU and the hydrogel WPBAPEGPU was tested using an RT-6000 transparency tester.
[0036] The innovative features of the present invention are:
[0037] The application develops a new and universal method for preparing porous hydrogel by microphase separation, copolymerizes substances with structural differences by efficient and selective "amino-epoxy" click polymerization, forms microphase separation micro-porous structure by thermodynamic incompatibility between structures, and the prepared hydrogel has good transparency, which provides a new idea for the preparation of transparent porous hydrogel. In addition, the application of bisphenol A diglycidyl ether in the field of hydrogel is innovative, which provides an effective way to alleviate the pressure of bisphenol A market in China.
[0038] The application has the following beneficial effects:
[0039] The microphase separation of the application generates micropores with a maximum of 122-330nm by the thermodynamic incompatibility between rigid bisphenol A segments and flexible hydrophilic polyethylene glycol segments, so that the PBAPEGPU has a transparency of 83.2-87.9%, and the WPBAPEGPU has a transparency of 88.9-96.3%. The simple and efficient "amino-epoxy" click polymerization ensures the smooth progress of the reaction, and the two-step crosslinking method ensures the repeatability of material preparation. By changing the types of amino monomers, the feeding ratio of each component, and the types of chemical crosslinking agents, various transparent porous hydrogels can be prepared, the tensile strength of the obtained PBAPEGPU crosslinked polymer network is in the range of 1.01-10.48MPa, the elongation at break is in the range of 86.3-238.1%, and the material has good mechanical properties. The glass transition temperature is in the range of-18℃-12℃, and the material behaves as a soft elastomer at room temperature. The water absorption swelling rate of the hydrogel WPBAPEGPU is in the range of 40.2-96.8%, and the high water absorption swelling rate can be achieved. BRIEF DESCRIPTION OF DRAWINGS
[0040] Figure 1 The scanning electron microscope photograph of the PBAPEGPU crosslinked polymer network of Example 2. DETAILED DESCRIPTION
[0041] The application will be further described below in combination with specific examples.
[0042] Example 1
[0043] In the first step, the polyhydroxy prepolymer PBAPEG is prepared by "amino-epoxy" click polymerization under the condition of inert gas protection.
[0044] First, bisphenol A diglycidyl ether (0.002 mol, 0.68 g) and polyethylene glycol glycidyl ether (1000 g / mol, 0.008 mol, 8 g) were added to 30 ml of DMF and thoroughly dissolved. 6-amino-1-hexanol (0.0075 mol, 0.88 g) was then added and stirred to obtain a mixed solution. The mixture was stirred in an oil bath at 140°C for 14 hours. After the reaction, the heat was turned off and the system was allowed to cool naturally with continued stirring to obtain a linear prepolymer solution containing the polyhydroxy prepolymer PBAPEG.
[0045] In the second step, a chemical cross-linking agent is reacted with the polyhydroxy prepolymer PBAPEG to generate a cross-linked polymer PBAPEGPU.
[0046] First, the chemical crosslinker HDI (0.00225 mol, 0.38 g) was diluted with 2 ml of DMF and added to the linear prepolymer solution. The solution was stirred for 15 minutes and then transferred to a horizontal mold in an oven. Next, the vacuum pump was turned on to observe the changes in the solution in the mold. The oven was maintained at a negative pressure until no bubbles were visible in the solution. The vent valve was opened to return the oven to atmospheric pressure. Finally, the oven temperature was set to 70°C. After 48 hours, the polymer was observed to transition from a liquid to a solid state. The solution was then transferred to a fume hood and the DMF solvent evaporated completely, resulting in an elastomeric crosslinked polymer, PBAPEGPU. It exhibited a tensile strength of 1.01 MPa, an elongation at break of 238.1%, a glass transition temperature of -18°C, a maximum pore size of 330 nm, and a transparency of 83.2%.
[0047] The third step is to obtain the transparent porous hydrogel WPBAPEGPU by immersion method.
[0048] The cross-linked polymer network PBAPEGPU was immersed in water for 10 minutes to obtain a transparent porous hydrogel WPBAPEGPU. Its swelling ratio was 93.8%, and its transparency was 96.3%.
[0049] Example 2
[0050] In the first step, the polyhydroxy prepolymer PBAPEG was prepared by "amino-epoxy" click polymerization under inert gas protection.
[0051] First, bisphenol A diglycidyl ether (0.005 mol, 1.7 g) and polyethylene glycol glycidyl ether (Mn = 500 g / mol, 0.005 mol, 2.5 g) were added to 15 ml of DMF and thoroughly dissolved. 3-Amino-1-propanol (0.0085 mol, 0.64 g) was then added and stirred to obtain a mixed solution. The mixture was stirred in an oil bath at 120°C for 12 hours. After the reaction, the heat was turned off and the system was allowed to cool naturally with continued stirring to obtain a linear prepolymer solution containing the polyhydroxy prepolymer PBAPEG.
[0052] In the second step, a chemical cross-linking agent is reacted with the polyhydroxy prepolymer PBAPEG to generate a cross-linked polymer PBAPEGPU.
[0053] First, the chemical crosslinker HDI (0.003825 mol, 0.64 g) was diluted with 2.5 ml of DMF and added to the linear prepolymer solution. The mixture was stirred for 10 minutes and then transferred to a horizontal mold in an oven. Next, the vacuum pump was turned on to observe the changes in the solution in the mold. The oven was maintained at a negative pressure until no bubbles were noticeable in the solution. The vent valve was opened to return the oven to atmospheric pressure. Finally, the oven temperature was set to 70°C. After 48 hours, the polymer was observed to transition from a liquid to a solid state. The solution was then transferred to a fume hood and the DMF solvent evaporated completely, resulting in an elastomeric crosslinked polymer, PBAPEGPU. It exhibited a tensile strength of 2.26 MPa, an elongation at break of 171.0%, a glass transition temperature of -4°C, a maximum pore size of 122 nm, and a transparency of 87.9%.
[0054] The third step is to obtain the transparent porous hydrogel WPBAPEGPU by immersion method.
[0055] The cross-linked polymer network PBAPEGPU was immersed in water for 15 minutes to obtain a transparent porous hydrogel WPBAPEGPU with a swelling ratio of 69.7% and a high transparency of 94.3%.
[0056] Depend on Figure 1 Scanning electron microscope photos show that the pores in the PBAPEGPU cross-linked polymer network are as small as nanometer size.
[0057] Example 3
[0058] In the first step, the polyhydroxy prepolymer PBAPEG was prepared by "amino-epoxy" click polymerization under inert gas protection.
[0059] First, bisphenol A diglycidyl ether (0.007 mol, 2.38 g) and polyethylene glycol glycidyl ether (6000 g / mol, 0.003 mol, 18 g) were thoroughly dissolved in 25 ml of THF. N,N'-dimethylhexanediamine (0.008 mol, 0.71 g) was then added and stirred to obtain a mixed solution. The mixture was stirred in an oil bath at 65°C for 8 hours. After the reaction, the heat was turned off and the system was allowed to cool naturally with continued stirring to obtain a linear prepolymer solution containing the polyhydroxy prepolymer PBAPEG.
[0060] In the second step, a chemical cross-linking agent is reacted with the polyhydroxy prepolymer PBAPEG to generate a cross-linked polymer PBAPEGPU.
[0061] First, the chemical crosslinker HMDI (0.0036 mol, 0.94 g) was diluted with 3 ml of DMF and added to the linear prepolymer solution. The mixture was stirred for 12 minutes and then transferred to a horizontal mold in an oven. Next, the vacuum pump was turned on to observe the changes in the solution in the mold. The oven was maintained at a negative pressure until no bubbles were visible in the solution. The vent valve was opened to return the oven to atmospheric pressure. Finally, the oven temperature was set to 50°C. After 38 hours, the polymer was observed to transition from a liquid to a solid state. The solution was then transferred to a fume hood and the THF solvent was completely evaporated to yield an elastomeric crosslinked polymer, PBAPEGPU. It exhibited a tensile strength of 1.12 MPa, an elongation at break of 186.3%, a glass transition temperature of -16°C, a maximum pore size of 188 nm, and a transparency of 86.4%.
[0062] The third step is to obtain the transparent porous hydrogel WPBAPEGPU by immersion method.
[0063] The cross-linked polymer network PBAPEGPU was immersed in water for 15 minutes to obtain a transparent porous hydrogel WPBAPEGPU with a swelling ratio of 96.8% and a transparency of 96.2%.
[0064] Example 4
[0065] In the first step, the polyhydroxy prepolymer PBAPEG was prepared by "amino-epoxy" click polymerization under inert gas protection.
[0066] First, bisphenol A diglycidyl ether (0.004 mol, 1.36 g) and polyethylene glycol glycidyl ether (0.006 mol, 3 g) were added to 30 ml of THF and thoroughly dissolved. N,N'-dimethyl-1,3-propylenediamine (0.009 mol, 0.92 g) was then added and stirred to obtain a mixed solution. The mixture was stirred in an oil bath at 60°C for 10 hours. After the reaction, the heat was turned off and the system was allowed to cool naturally with continued stirring to obtain a linear prepolymer solution containing the polyhydroxy prepolymer PBAPEG.
[0067] In the second step, a chemical cross-linking agent is reacted with the polyhydroxy prepolymer PBAPEG to generate a cross-linked polymer PBAPEGPU.
[0068] First, the chemical crosslinker MDI (0.0054 mol, 1.35 g) was diluted with 3.5 ml of DMF and added to the linear prepolymer solution. The mixture was stirred for 15 minutes and then transferred to a horizontal mold in an oven. Next, the vacuum pump was turned on to observe the changes in the solution in the mold. The oven was maintained at a negative pressure until no bubbles were noticeable. The vent valve was opened to return the oven to atmospheric pressure. Finally, the oven temperature was set to 40°C. After 44 hours, the polymer was observed to transition from a liquid to a solid state. The solution was then transferred to a fume hood and the THF solvent was completely evaporated to yield an elastomeric crosslinked polymer, PBAPEGPU. It exhibited a tensile strength of 3.45 MPa, an elongation at break of 163.1%, a glass transition temperature of 1°C, a maximum pore size of 153 nm, and a transparency of 87.1%.
[0069] The third step is to obtain the transparent porous hydrogel WPBAPEGPU by immersion method.
[0070] The cross-linked polymer network PBAPEGPU was immersed in water for 25 minutes to obtain a transparent porous hydrogel WPBAPEGPU with a swelling ratio of 61.0% and a transparency of 92.0%.
[0071] Example 5
[0072] In the first step, the polyhydroxy prepolymer PBAPEG was prepared by "amino-epoxy" click polymerization under inert gas protection.
[0073] First, bisphenol A diglycidyl ether (0.008 mol, 2.72 g) and polyethylene glycol glycidyl ether (500 g / mol, 0.002 mol, 1 g) were dissolved in 15 ml of DMSO. 2-Amino-1-butanol (0.0095 mol, 0.85 g) was then added and stirred to obtain a mixed solution. The mixture was stirred in an oil bath at 60°C for 6 h. After the reaction, the heat was turned off and the system was allowed to cool naturally with continued stirring to obtain a linear prepolymer solution containing the polyhydroxy prepolymer PBAPEG.
[0074] In the second step, a chemical cross-linking agent is reacted with the polyhydroxy prepolymer PBAPEG to generate a cross-linked polymer PBAPEGPU.
[0075] First, the chemical crosslinker MDI (0.007125 mol, 1.78 g) was diluted with 4 ml of DMF and added to the linear prepolymer solution. The mixture was stirred for 5 minutes and then transferred to a horizontal mold in an oven. Next, the vacuum pump was turned on to observe the changes in the solution in the mold. The oven was maintained at a negative pressure until no bubbles were noticeable. The vent valve was opened to return the oven to atmospheric pressure. Finally, the oven temperature was set to 40°C. After 36 hours, the polymer was observed to transition from a liquid to a solid state. The solution was then transferred to a fume hood and the DMSO solvent was completely evaporated to yield an elastomeric crosslinked polymer, PBAPEGPU. It exhibited a tensile strength of 10.48 MPa, an elongation at break of 86.3%, a glass transition temperature of 12°C, a maximum pore size of 283 nm, and a transparency of 84.3%.
[0076] The third step is to obtain the transparent porous hydrogel WPBAPEGPU by immersion method.
[0077] The cross-linked polymer network PBAPEGPU was immersed in water for 30 minutes to obtain a transparent porous hydrogel WPBAPEGPU with a swelling ratio of 40.2% and a transparency of 88.9%.
[0078] The above-described embodiments merely express the implementation methods of the present invention, but should not be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention.
Claims
1. A method for preparing a bisphenol A type transparent porous hydrogel, characterized in that: The preparation method is based on an "amino-epoxy" click reaction. Bisphenol A diglycidyl ether and polyethylene glycol glycidyl ether at different feed ratios are polymerized with different amino monomers to form a polyhydroxy prepolymer. The amino monomers include 3-amino-1-propanol, 6-amino-1-hexanol, 2-amino-1-butanol, N,N'-dimethylhexanediamine, or N,N'-dimethyl-1,3-propylenediamine. Isocyanate chemical crosslinking agents with different feed ratios and structures are then added to react with hydroxyl groups to form a crosslinked polymer network. Finally, the crosslinked polymer network is immersed in water to prepare the prepolymer.
2. The method for preparing a bisphenol A type transparent porous hydrogel according to claim 1, characterized in that: The following steps are involved: In the first step, polyhydroxy prepolymer PBAPEG was prepared by amino-epoxy click polymerization under inert gas protection; First, bisphenol A diglycidyl ether and polyethylene glycol glycidyl ether are added to an organic solvent and fully dissolved, and then an amino monomer is added and stirred to obtain a mixed solution, which is reacted in an oil bath at 60-140° C. with stirring for 6-14 hours. After the reaction is completed, the solution is cooled naturally to obtain a linear prepolymer solution containing a polyhydroxy prepolymer PBAPEG. In the second step, a chemical crosslinking agent reacts with the polyhydroxy prepolymer PBAPEG to generate a crosslinked polymer network PBAPEGPU; First, a chemical crosslinker is added to the linear prepolymer solution, stirred evenly, and transferred to a horizontally placed mold in an oven; Next, the vacuum pump was turned on to maintain a negative pressure in the oven until no bubbles were noticeable in the solution. The vent valve was then opened to return the oven to atmospheric pressure. Finally, the oven temperature was set to 40-70°C. After 36-48 hours, the polymer was observed to transform from a liquid to a solid state. The polymer was then transferred to a fume hood and the solvent was completely evaporated to obtain an elastomeric cross-linked polymer, PBAPEGPU. The third step is to obtain the transparent porous hydrogel WPBAPEGPU by immersion method.
3. The method for preparing a bisphenol A type transparent porous hydrogel according to claim 2, characterized in that: The molar ratio of bisphenol A diglycidyl ether to polyethylene glycol glycidyl ether is 1:(0.25-4), wherein the concentration of bisphenol A diglycidyl ether in the mixed solution is 0.133-0.533 mol / L; the amount of the amino monomer is 0.75-0.95 times the total molar amount of the bisphenol A diglycidyl ether and polyethylene glycol glycidyl ether epoxy monomers.
4. The method for preparing a bisphenol A type transparent porous hydrogel according to claim 2, characterized in that: The molar ratio of the cross-linking agent to the amino monomer is (0.3-0.75):
1.
5. The method for preparing a bisphenol A type transparent porous hydrogel according to claim 2, characterized in that: The amino monomers include 3-amino-1-propanol, 6-amino-1-hexanol, 2-amino-1-butanol, N,N'-dimethylhexanediamine or N,N'-dimethyl-1,3-propylenediamine; the chemical crosslinking agents include hexamethylene diisocyanate, diphenylmethane diisocyanate, and dicyclohexylmethane diisocyanate.
6. The method for preparing a bisphenol A type transparent porous hydrogel according to claim 2, characterized in that: The organic solvent includes N,N-dimethylformamide, dimethyl sulfoxide, and tetrahydrofuran.
7. The method for preparing a bisphenol A type transparent porous hydrogel according to claim 2, characterized in that: In the second step, the chemical crosslinking agent is diluted with 2-4 ml of an organic solvent and then added dropwise to the linear prepolymer solution.
8. The method for preparing a bisphenol A type transparent porous hydrogel according to claim 2, characterized in that: In the second step, the stirring time is 5-15 minutes.
9. The method for preparing a bisphenol A type transparent porous hydrogel according to claim 2, characterized in that: In the third step, the cross-linked polymer network PBAPEGPU is immersed in water for 10-30 minutes to obtain a transparent porous hydrogel WPBAPEGPU.
10. A bisphenol A type transparent porous hydrogel, characterized in that: The bisphenol A type transparent porous hydrogel is prepared by the preparation method described in any one of claims 1 to 9.
Citation Information
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