Method for preparing polyacrylic acid composite macromolecular hydrogel by macromolecular chain template method
A technology of compounding macromolecules and macromolecular chains, applied in the field of polyacrylic acid compound hydrogel and its preparation, can solve the problem of weak mechanical strength and healing ability of gel, inability to self-repair to the original state, difficult to apply soft tissue materials, etc. problems, to achieve the effect of improving self-healing performance and mechanical properties, simple self-healing process, and excellent mechanical properties
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Embodiment 1
[0028] 1) Add 5 g of amino-terminated polyethylene glycol (PEG 500 ) was dissolved in 10 mL of anhydrous dichloromethane, added 0.05 mL of triethylamine, N 2 protection, stirred in ice bath for 1 h; then added 0.05 g of 2,6-pyridinedicarbonyl chloride, continued to stir for 1 h in ice bath, and finally added 10 mL of methanol to quench the reaction, precipitated and washed 3 times in diethyl ether, at 50 °C Vacuum dry.
[0029] 2) Add 0.25 g of extended chain PEG 500 Dissolve in 5 mL of deionized water, then add 2 g of acrylic acid monomer and stir for 20 min.
[0030] 3) Add 0.025 g FeCl 3 In the above mixture, continue to stir for 20 min.
[0031] 4) Add 0.025 g of ammonium persulfate to the above solution and continue stirring for 5 min.
[0032] 5) Inject the above liquid into a specific mold and react at 25°C for 2 h.
[0033] 6) The prepared composite hydrogel was taken out and immersed in deionized water for 24 h to remove unreacted monomers, initiators and metal ...
Embodiment 2
[0036] 1) Add 5 g of amino-terminated polyethylene glycol (PEG 1000 ) was dissolved in 20 mL of anhydrous dichloromethane, added 0.5 mL of triethylamine, N 2 protection, stirred in ice bath for 1 h; then added 0.5 g of 2,6-pyridinedicarbonyl chloride, continued to stir for 1 h in ice bath, and finally added 10 mL of methanol to quench the reaction, precipitated and washed 3 times in ether, at 50 °C Vacuum dry.
[0037] 2) Add 0.25g chain extension PEG 1000 Dissolve in 5 mL of deionized water, then add 2 g of acrylic acid monomer and stir for 20 min.
[0038] 3) Add 0.05 g FeCl 3 In the above mixture, continue to stir for 20 min.
[0039] 4) Add 0.05 g of ammonium persulfate to the above solution and continue stirring for 5 min.
[0040] 5) Inject the above liquid into a specific mold and react at 25°C for 6 h.
[0041] 6) The prepared composite hydrogel was taken out and immersed in deionized water for 24 h to remove unreacted monomers, initiators and metal ions.
[004...
Embodiment 3
[0044] 1) Add 5 g of amino-terminated polyethylene glycol PEG 2000Dissolve in 20 mL of anhydrous dichloromethane, add 0.25 mL of triethylamine, N 2 Protected, stirred in ice bath for 2 h; then added 0.25 g of 2,6 pyridinedicarbonyl chloride, continued to stir for 2 h in ice bath, finally added 5 mL of methanol to quench the reaction, washed the precipitate in diethyl ether for 5 times, and dried in vacuum at 50 °C .
[0045] 2) Add 0.5 g chain-extended PEG 2000 Dissolve in 10 mL of deionized water, then add 2 g of acrylic acid monomer and stir for 20 min.
[0046] 3) Add 0.1 g FeCl 3 In the above mixture, continue to stir for 20 min.
[0047] 4) Add 0.1 g of ammonium persulfate to the above solution, and continue stirring for 5 min.
[0048] 5) Inject the above liquid into a specific mold and react at 25°C for 6 h.
[0049] 6) The prepared composite hydrogel was taken out and immersed in deionized water for 24 h to remove unreacted monomers, initiators and metal ions.
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