Hyperbranched polyaminoester capable of emitting multicolor fluorescence and preparation method thereof
A technology of polyurethane and terminal hydroxyl hyperbranching, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of single chromatogram, low fluorescence intensity, low quantum yield, etc., and achieve simple synthesis process and high fluorescence intensity , good biodegradability
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example 1
[0034] The preparation method of hydroxyl-terminated hyperbranched polyurethane: under the protection of nitrogen, citric acid and N-methyldiethanolamine are reacted at a molar ratio of 1:1.6, and the raw materials are dissolved at 120 ° C ~ 145 ° C, and the total mass of the reactants is added 0.5% p-toluenesulfonic acid, gradually increase the temperature to 160°C, and react for 4 hours. Then react for 4 hours under negative pressure environment, and the product is a blood-red viscous liquid. Next, the product was dissolved in water, precipitated by adding acetone, filtered, and vacuum-dried to obtain a hydroxyl-terminated hyperbranched polyurethane.
example 2
[0036] The preparation method of hydroxyl-terminated hyperbranched polyurethane: under the protection of nitrogen, citric acid and N-methyldiethanolamine are reacted at a molar ratio of 1:2.0, and the raw materials are dissolved at 120 ° C ~ 145 ° C, and the total mass of the reactants is added With 0.8% p-toluenesulfonic acid, gradually increase the temperature to 140°C, react for 6 hours, and then react for 6 hours under a negative pressure environment, and the product is a blood-red viscous liquid. Next, the product was dissolved in water, precipitated by adding acetone, filtered, and vacuum-dried to obtain a hydroxyl-terminated hyperbranched polyurethane.
example 3
[0038] The preparation method of hydroxyl-terminated hyperbranched polyurethane: under the protection of nitrogen, citric acid and N-methyldiethanolamine are reacted at a molar ratio of 1:2.2, and the raw materials are dissolved at 120 ° C ~ 145 ° C, and the total mass of the reactants is added With 0.1% p-toluenesulfonic acid, gradually increase the temperature to 160°C, react for 4 hours, and then react for 4 hours in a negative pressure environment, and the product is a blood-red viscous liquid. Next, the product was dissolved in water, precipitated by adding acetone, filtered, and vacuum-dried to obtain a hydroxyl-terminated hyperbranched polyurethane.
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