A kind of preparation method of metal ion-enhanced γ-polyglutamic acid hydrogel
A technology of polyglutamic acid and metal ions, which is applied in the field of preparation of reinforced hydrogels, can solve the problems of decreased mechanical strength and small swelling coefficient, and achieves the effects of increased mechanical strength, variable swelling coefficient and high tensile strength
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Embodiment 1
[0031] Weigh 1g of γ-PGA powder with a molecular weight of 200,000 to 2 million units, dissolve it in 10ml of deionized water, and use magnetic stirring for 2-3h to completely dissolve it. 5h, make the γ-PGA and GPTMS cross-linking reaction, then pour the liquid polymer solution into the mold, put it in a 37 ℃ oven for 8-12h until it gels and take it out to obtain γ-PGA hydrogel. The hydrogel was cut into strip samples with substantially the same length and width.
Embodiment 2
[0033] Further, weigh 0.373g, 1.118g, 1.863g, 2.795g, 3.726g CeCl respectively 3 ·7H 2 O was dissolved in 50ml ultrapure water and prepared into 0.02M (mol / L), 0.06M, 0.1M, 0.15M, 0.2M Ce 3+ concentration of the aqueous solution, the hydrogel splines prepared in Example 1 were immersed in different Ce 3+ Concentration solution for 16h, take out and dry for 30-45min to obtain metal ion-enhanced γ-PGA hydrogel.
[0034] Measured by tensile experiments with Ce 3+ The tensile strength of the chelated γ-PGA hydrogel, figure 1 , 2 for Ce 3+ Comparison of tensile strength and elongation at break of chelated hydrogels at different concentrations of ions, corresponding to unsoaked Ce 3+ Ionic γ-PGA hydrogel samples and 0.02M (mol / L), 0.06M, 0.1M, 0.15M, 0.2M Ce 3+ The samples after soaking in the concentrated aqueous solution, the test results show that: compared with the tensile strength of γ-PGA hydrogel after Ce 3+ The tensile strength of the hydrogel after ion chelation rea...
Embodiment 3
[0036] Weigh 0.258g, 0.775g, 1.293g, 1.938g, 2.584g CeCl respectively 3 ·7H 2 O was dissolved in 50ml ultrapure water and prepared into 0.02M (mol / L), 0.06M, 0.1M, 0.15M, 0.2M La 3+ concentration of the aqueous solution, the hydrogel splines prepared in Example 1 were immersed in different La 3+ Concentration solution for 16h, take out and dry for 30-45min to obtain metal ion-enhanced γ-PGA hydrogel.
[0037] Measured by tensile experiments with La 3+ The tensile strength of the chelated γ-PGA hydrogel, Figure 5 , 6 for La 3+ Comparative phase diagram of tensile strength and elongation at break of chelated hydrogels at different concentrations, compared with the tensile strength of γ-PGA hydrogels through La 3+ The tensile strength of the hydrogel after the chelation reaction increased by a maximum of 118 times, and the elongation at break decreased slightly, but the tensile strength was significantly improved. Figure 7 for La 3+ Young's modulus of chelated hydrogels...
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