Preparation method of high-strength hydrogel
A hydrogel, high-strength technology, applied in the field of hydrogels, can solve the problems of complex and time-consuming preparation process, restricting the application of high-strength hydrogels, etc., and achieves green and safe preparation process, short preparation process time, and energy consumption. small effect
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[0027] A method for preparing a high-strength hydrogel. The specific preparation method is that the high-strength hydrogel adopts a "one-pot cooking" method, that is, the first step required for the preparation of the hydrogel to form a double network gel The polymer of the network, the monomer used to polymerize to form the second heavy network of the double network hydrogel, the initiator used to initiate the polymerization of the monomer, and the crosslinking reaction to occur simultaneously during the polymerization of the monomer to form the second The cross-linking agent of the heavy network is directly mixed with water at one time, and all the substances are dissolved to form a homogeneous solution under certain stimulating conditions, and then heat or light is used to initiate polymerization to obtain a high-strength hydrogel;
[0028] The polymer used to form the first network of the double network gel is agar, agarose, gelatin, collagen, fibrin, alginate, hyaluronate, ch...
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[0037] Example 1
[0038] Mix 20 mg agar, 2400 mg acrylamide, 0.0575 g 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone, 78 μL N,N'-methylenebisacrylamide solution ( 20 mg / mL) was accurately weighed and added to the reactor, and then 10 mL of deionized water was added. Seal the reaction liquid and circulate the oxygen and nitrogen flushing three times, at 90~95 o Heat and stir in the oil bath or water bath of C for 5-10 minutes to form a homogeneous transparent clear solution, then pour the solution into the reaction mold and cool it to room temperature to form agar gel. After the above agar gel is polymerized under 365 nm ultraviolet light for 1 h, it can be obtained as figure 1 , 2 , 3, 4 shows the high-strength hydrogel (the gel can be bent, knotted, compressed and stretched without breaking). The stress-strain curve of the tensile test of Agar / PAM DN gel is as follows: Figure 5 As shown in the figure, a is the stress-strain curve of the high-strength hydrogel of this ...
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[0039] Example 2
[0040] 50 mg gelatin, 2000 mg acrylamide, 29 μL N,N'-methylenebisacrylamide solution (20 mg / mL) were accurately weighed and added to the reactor, and then 10 mL deionized water was added. After the reaction liquid is sealed, the oxygen and nitrogen are circulated three times, at 60 o Heat and stir in the oil bath or water bath of C for 5-10 min to form a homogeneous transparent clear solution. Add 120 μL of ammonium persulfate or potassium persulfate aqueous solution (20 mg / mL) and pour the solution into the reaction mold to make Of 60 o C reacts for 2 h and then at 4 o C cool down for 0.5 h. The tensile strength is 1.2 MPa, the tensile modulus is 146 KPa, the elongation at break is 1740%, the compressive strength is about 40 MPa, the compressive modulus is about 155 KPa, the compressive strain is 96%, and the toughness of the gel reaches 800 J / m. 2 .
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