A preparation method of self-healing hydrogel with UV and pH sensitivity
A hydrogel and self-healing technology is applied in the field of rapid preparation of UV- and pH-sensitive self-healing hydrogels, which can solve the problems of poor biocompatibility, low self-healing efficiency, and self-healing hydrogel synthesis. Complex steps, etc., to achieve the effect of good mechanical properties and obvious pH sensitivity
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Embodiment 1
[0039] A method for preparing a UV-sensitive, pH-sensitive self-healing hydrogel, comprising the following steps:
[0040] Step 1. Preparation of azobenzene polymerizable monomer: add 5.70 g of p-aminoazobenzene monomer to a round bottom flask, stir and dissolve with 10 mL of toluene, then add 4.0 mL of triethylamine and 30 mg of hydroquinone in turn, at room temperature, While stirring, add methacryloyl chloride or acryloyl chloride 0.8 times the molar amount of azobenzene dropwise until an orange-red solid appears, stir and reflux at 55°C for three hours to react, after the end, cool, filter with suction, and vacuum dry at 55°C to remove toluene. The orange-red solid was washed with a small amount of distilled water, filtered with suction, vacuum-dried at 45°C to remove water, and recrystallized once in absolute ethanol to obtain orange-red crystals, which were dried in vacuum;
[0041] Step 2, to prepare the polymerizable monomer of phenylboronic acid, accurately weigh 1.50...
Embodiment 2
[0046] A method for preparing a UV-sensitive, pH-sensitive self-healing hydrogel, comprising the following steps:
[0047] Step 1, prepare azobenzene polymerizable monomer: add 6.00g of p-aminoazobenzene monomer into a round bottom flask, stir and dissolve with 20mL of toluene, add 4.2mL of triethylamine and 40mg of hydroquinone in turn, at room temperature, While stirring, add methacryloyl chloride or acryloyl chloride with 1.1 times the molar amount of azobenzene dropwise until an orange-red solid appears, stir and reflux at 65°C for three hours to react, after the end, cool, filter with suction, and dry toluene under vacuum at 65°C to obtain orange The red solid was washed with a small amount of distilled water, filtered with suction, dried under vacuum at 50°C to remove water, and recrystallized twice in absolute ethanol to obtain orange-red crystals, which were dried under vacuum;
[0048] Step 2, preparation of phenylboronic acid polymerizable monomer: accurately weigh 1...
Embodiment 3
[0053] A method for preparing a UV-sensitive, pH-sensitive self-healing hydrogel, comprising the following steps:
[0054] Step 1, prepare azobenzene polymerizable monomer: add 6.10g p-aminoazobenzene monomer into a round bottom flask, stir and dissolve with 40mL toluene, add 4.5mL triethylamine and 50mg hydroquinone in turn, at room temperature, While stirring, add methacryloyl chloride or acryloyl chloride 1.5 times the molar amount of azobenzene dropwise until an orange-red solid appears, stir and reflux at 70°C for three hours to react, after the end, cool, filter with suction, and dry toluene under vacuum at 70°C to obtain orange The red solid was washed with a small amount of distilled water, filtered with suction, dried under vacuum at 55°C to remove water, and recrystallized three times in absolute ethanol to obtain orange-red crystals, which were dried under vacuum;
[0055] Step 2, preparation of phenylboronic acid polymerizable monomer: accurately weigh 1.70g of 3-a...
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