Preparation method and application of self-repairing polymer based on reversible imine bond
A polymer and self-healing technology, applied in the field of polymer material preparation, can solve the problems of poor toughness, low mechanical strength, and weak self-healing ability, and achieve good mechanical strength, simple preparation method, and good self-healing performance
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[0036] In one embodiment of the present invention, a method for preparing a self-healing polymer with reversible imine bonds is provided, and the steps of the method are as follows:
[0037] After the SA-PU solution was cooled down, the polyamino compound solution was added, stirred evenly and left to stand at room temperature for reaction, and the solvent was evaporated until the obtained membrane material had a constant weight, and a self-healing polymer material (SR-PU) based on a reversible imine bond was obtained.
[0038] Preferably, the SA-PU solution is cooled to 0-5°C;
[0039] Preferably, after stirring evenly, the step of degassing under reduced pressure is also included;
[0040] Preferably, standing reaction for 3-4.5h;
[0041] Preferably, the temperature of the volatile solvent is 35-40°C, and the time is 36-48h;
[0042] Preferably, the polyamino compound is preferably polyethyleneimine; the added amount of the polyamino compound is that the molar ratio of th...
Embodiment 1
[0051] Step 1: Preparation of branched chain aldehyde-containing polymers:
[0052] Dissolve 20g of polypropylene oxide (molecular weight 4000g / mol), 1.10g of 4-bromo-2,3-dihydroxybenzaldehyde and 0.02g of dibutyltin dilaurate in 45mL of DMF, stir evenly, and add 2.5g Diphenylmethane diisocyanate was reacted at 75° C. for 2.5 hours under mechanical stirring to obtain a polymer (SA-PU) solution with branched chains of aldehyde groups.
[0053] Step 2: Preparation of self-healing polymers based on reversible imine bonds:
[0054] Cool the SA-PU solution to 0-5°C, add 12.5mL polyethyleneimine (molecular weight: 10000 g / mol) DMF solution (0.5g / mL), stir evenly, remove the gas under reduced pressure, and then slowly Pour it into a mold, let it stand at room temperature for 3-4.5 hours, and finally evaporate the solvent at 35-40°C until the obtained membrane material has a constant weight, about 36-48 hours, and obtain a self-healing polymer based on a reversible imine bond ( SR-PU)...
Embodiment 2
[0056] Step 1: Preparation of branched chain aldehyde-containing polymers:
[0057] Dissolve 5g of polypropylene oxide (molecular weight: 10000g / mol), 0.07g of 2,4-dihydroxybenzaldehyde) and 0.01g of stannous octoate in 10mL of DMF, stir evenly, add 0.2g of toluene diisocyanate, and mechanically stir At 90°C for 2.5 hours, a polymer (SA-PU) solution with branched chains of aldehyde groups was obtained.
[0058] Step 2: Preparation of self-healing polymers based on reversible imine bonds:
[0059] Cool the SA-PU solution to 0-5°C, add 2.5mL polyethyleneimine (molecular weight: 5000g / mol) DMF solution (0.5g / ml), stir evenly, remove the gas under reduced pressure, and then pour it slowly Put it into a mold, let it stand at room temperature for 3.5-4.5h, and finally evaporate the solvent at 35-40°C until the obtained membrane material has a constant weight, about 36-48h, and obtain a self-healing polymer based on a reversible imine bond (SR -PU), denoted as P 2 .
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