Multi-block polyurethane shape memory high molecule material and preparation method thereof
A technology of polymer materials and polyurethane, applied in the field of shape memory polymer materials and its preparation, can solve the problems of slow degradation of PCL and achieve good biodegradability, high mechanical strength and flexibility
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Embodiment 1
[0031] Weigh 5.000 g (0.03472 mol) of D, L-lactide (LA) which has been distilled and recrystallized, and 1.25 mL (density: 1.266 g / mL, 0.01551mol), chloroform solution of stannous octoate (T-9) 16.1uL (3.4×10 -6 mol), ethylene glycol 32uL, mix well, and vacuumize for 10-20min. After sealing, place it in a constant temperature oil bath at 130°C for 16 hours. The reaction product was dissolved in acetone, purified with n-hexane, and dried under vacuum at room temperature to obtain 3.8 g of hydroxyl-terminated polymer HO-P(LA-co-PDO)-OH. The number average molecular weight measured by terminal hydroxyl analysis method is 2100, T g = 20.54°C.
Embodiment 2
[0033] Weigh 5.000 g (0.03472 mol) of D, L-lactide (LA) which has been distilled and recrystallized, and 1.25 mL (density: 1.266 g / mL, 0.01551mol), chloroform solution of stannous octoate (T-9) 16.1uL (3.4×10 -6 mol), diethanolamine 55uL, mix thoroughly and evenly, and vacuumize for 10-20min. After sealing, place it in a constant temperature oil bath at 130°C for 16 hours. The reaction product was dissolved in acetone, purified with n-hexane, and dried under vacuum at room temperature to obtain 3.6 g of hydroxyl-terminated polymer HO-P(LA-co-PDO)-OH. The number average molecular weight measured by terminal hydroxyl analysis method is 2400, T g = 21.98°C.
Embodiment 3
[0035] Weigh 5.000 g (0.03472 mol) of distilled and recrystallized D, L-lactide (LA), 0.40 mL (density: 1.266 g / mL, 0.00496mol), chloroform solution of stannous octoate (T-9) 12.8uL (2.7×10 -6 mol), ethylene glycol 32uL, mix well, and vacuumize for 10-20min. After sealing, place it in a constant temperature oil bath at 140°C for 24 hours. The reaction product was dissolved in acetone, purified with n-hexane, and dried under vacuum at room temperature to obtain 3.9 g of hydroxyl-terminated polymer HO-P(LA-co-PDO)-OH. The number average molecular weight measured by terminal hydroxyl analysis method is 19970, T g = 39.59°C.
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