A photothermal dual response high-strength hydrogel and its preparation method and application
A dual-response, hydrogel technology, applied in the fields of light-controlled valves, smart windows and biomedicine, can solve the problems of limited application and poor mechanical properties, and achieve the effect of changing hydrophilicity and hydrophobicity, good fatigue resistance, and fast reversible response.
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Embodiment 1
[0032] Synthesis of γ-PGA-GMA (Mn=1000000g / mol): First accurately weigh 4.01g of γ-PGA dissolved in 100mL of 5wt% NaHCO 3 In the aqueous solution, slowly stir until γ-PGA is fully dissolved, and then let stand to remove air bubbles; then add 0.1 g of 4-dimethylaminopyridine (DMAP), stir to dissolve fully, continue to slowly dropwise add 4.1 mL of glycidyl methacrylate ( GMA). Then the above solution was slowly stirred and reacted in the dark for 60 hours, and then the reacted solution was put into a dialysis bag with a molecular weight cut-off of 3500, dialyzed in distilled water for three days, and the water was changed at least three times a day. GMA. Its structure was characterized by nuclear magnetic technology, and the graft ratio was calculated to be 10%.
Embodiment 2
[0034] Synthesis of spiropyran monomer SPMA: All reaction vessels were covered with aluminum foil and protected from light.
[0035] (1) Accurately measure 10.1 mL (0.06 mol) of 2,3,3-trimethyl-3H-indole and 12.6 g (0.06 mol) of 3-iodopropionic acid and heat to 100°C under nitrogen to react for 3 hours; The remaining solid was dissolved in deionized water and washed with chloroform, and then evaporated to remove water to obtain an iodinated intermediate product—Intermediate A with a yield of 75%; its structural formula is as follows:
[0036]
[0037] (2) Dissolve 14g (0.04mol) of Intermediate A, 6.5g (0.04mol) of 5-nitrosalicylaldehyde and 3.8mL (0.04mol) of piperidine together in methyl ethyl ketone to obtain a red reaction solution, The reaction was refluxed for 3 hours; then left to stand overnight, a yellow powdery solid was precipitated. It was then filtered and washed repeatedly with methanol to give Intermediate B in 78% yield. Its structural formula is as follows...
Embodiment 3
[0042] The aqueous solutions of γ-PGA-GMA (Mn=1000000g / mol, grafting rate 10%) with mass concentrations of 0.02g / mL and 0.03g / mL were prepared respectively, and photoinitiator Irgacure 2959 was added to make the concentration 0.0005g / mL, centrifuge to remove air bubbles. Pipette the above solution and place it in a mold, and irradiate it under ultraviolet light with a wavelength of 365 nm for 10 minutes to obtain the first network hydrogel γ-PGA hydrogel, named PGA2 and PGA3 respectively, and test its mechanics on a universal testing machine. performance.
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