PH-sensitive biodegradable polyurethane-urea material and preparation method thereof
A polyurethane urea and biodegradation technology, applied in the field of polymer chemistry, can solve the problems of long time consumption and complicated preparation process, and achieve the effects of improving mechanical properties, simple process and avoiding acid inflammation
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Embodiment 1
[0057] Under the protection of dry nitrogen, 10.0g (5mmol) PLA-PEG-PLA (M n =2000, the mass content of PEG is 22.0%) mixed with 6.30g (30mmol) N,N-di(2-hydroxyethyl)isonicotinamide, added N,N-dimethylformamide (DMF) to dissolve (0.5 g / mL), the temperature of the reaction system was raised to 80°C, and the DMF solution (1.0g / mL) of LBL (35.7mmol) was added dropwise. About 10% solution, 8 times the volume of glacial ether is settled, and the obtained solid is vacuum-dried at 35°C to obtain pH-sensitive biodegradable polyurethane urea;
[0058] Dissolve the solid in the organic solvent chloroform to make a solution with a concentration of 6.0% (g / mL), volatilize it with a polytetrafluoroethylene film at 25°C under normal pressure for 80 hours, remove the film from the film, and then warm it at ordinary times. Vacuum-dried to obtain pH-sensitive biodegradable polyurethane urea film material I, and the drug-loaded film material was prepared in the same way.
Embodiment 2
[0060] Under dry nitrogen protection, 20.0g (10mmol) PCL-PEG-PCL (M n =2000, the mass content of PEG is 26.4%) mixed with 14.70g (70mmol) N,N-bis(2-hydroxyethyl)isonicotinamide, added N,N-dimethylformamide (DMF) to dissolve (0.5 g / mL), the temperature of the reaction system was raised to 85°C, and a DMF solution (1.0 g / mL) of LBL (82.1 mmol) was added dropwise. About 10% solution, 8 times the volume of glacial ether is settled, and the obtained solid is vacuum-dried at 35°C to obtain pH-sensitive biodegradable polyurethane urea;
[0061] Dissolve the solid in the organic solvent chloroform to make a concentration of 5.0% (g / mL), use a polytetrafluoroethylene film to volatilize at 28°C under normal pressure for 90 hours, remove the film from the film, and dry it in vacuum at room temperature , to obtain the pH-sensitive biodegradable polyurethane urea membrane material II, and prepare the drug-loaded membrane material by the same method.
Embodiment 3
[0063] Under the protection of dry nitrogen, 15.0g (5mmol) PLA-PEG-PLA (M n =3000, the mass content of PEG is 43.3%) mixed with 8.40g (40mmol) N,N-di(2-hydroxyethyl)isonicotinamide, adding N,N-dimethylformamide (DMF) to dissolve (0.6 g / mL), the temperature of the reaction system was raised to 90°C, and a DMF solution (1.0 g / mL) of LBL (45.7 mmol) was added dropwise. About 10% solution, 8 times the volume of glacial ether is settled, and the obtained solid is vacuum-dried at 35°C to obtain pH-sensitive biodegradable polyurethane urea;
[0064] Dissolve the solid in the organic solvent chloroform to make a concentration of 6.0% (g / mL), use a polytetrafluoroethylene film to volatilize at 22°C under normal pressure for 75 hours, remove the film from the film, and dry it in vacuum at normal temperature , to obtain the pH-sensitive biodegradable polyurethane urea membrane material III, and prepare the drug-loaded membrane material by the same method.
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