Polyurethane with shape memory function and preparation method thereof
A polyurethane and polyurethane prepolymer technology, applied in the field of intelligent polymer materials, can solve the problems of low tensile strength, elastic modulus, elongation at break and shape recovery rate, poor rigidity and elasticity, limited application, etc. The effect of strong stretchability, easy operation and wide temperature range
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[0020] A method for preparing polyurethane with shape memory function provided by an aspect of the embodiments of the present invention includes:
[0021] reacting the first mixed reaction system comprising polycaprolactone diol, diisocyanate, catalyst and organic solvent to produce a polyurethane prepolymer; and,
[0022] reacting the second mixed reaction system comprising the polyurethane prepolymer, a chain extender and an organic solvent, and then curing the obtained reaction product to obtain a polyurethane with a shape memory function, wherein the chain extender includes 1,4- Butanediol (BDO).
[0023] In some embodiments, the preparation method specifically includes: uniformly mixing polycaprolactone diol, diisocyanate, catalyst, and organic solvent to form a first mixed reaction system, and then microwave reaction at 55-65°C for 30-90 minutes , to prepare the polyurethane prepolymer.
[0024] In some embodiments, the polycaprolactone diol has a weight average molecu...
Embodiment 1
[0040] refer to figure 1 As shown, put 5.00g of polycaprolactone diol with a molecular weight of 1000 into a round bottom flask, add 2.50g of diphenylmethane diisocyanate (MDI), and then add 20ml of tetrahydrofuran (THF) and 1% eqv of Dibutyltin dilaurate reacted with microwaves at 55°C for 45 minutes to obtain a polyurethane prepolymer. The amount of chain extender 1,4-butanediol (BDO) added was determined to be 0.356 g by acetone-di-n-butylamine titration. Add 15ml of N,N-dimethylformamide (DMF), microwave at 65°C for 60 minutes, and finally pour into a preheated mold at 55°C, and cure in a vacuum oven at 80°C for 19 hours to obtain a shape memory Functional polyurethane (marked as polyurethane PU-1), its performance test results are shown in Table 1.
[0041] Please refer to the FT-IR figure of the polyurethane with shape memory function obtained in this embodiment figure 2 , the shape memory curve (DMA) diagram see image 3 , wherein the secondary cycle shape fixation ...
Embodiment 2
[0043] Put 5.00g of polycaprolactone diol with a molecular weight of 1000 into a round bottom flask, add 2.62g of dicyclohexyl diisocyanate (HMDI), and then add 20ml of dichloroethane and 1% eqv of dilauric acid di Butyl tin reacted with microwaves at 60°C for 50 minutes to obtain a prepolymer of polyurethane. The acetone-di-n-butylamine titration method determined that the amount of chain extender 1,4-butanediol (BDO) added was 0.362 g, and 15 ml of N was added. N-dimethylformamide (DMF) reacted with microwave at 70°C for 60min, and finally poured it into a mold preheated at 80°C, and cured it in a vacuum oven at 80°C for 24h to obtain a polyurethane with shape memory function ( Marked as polyurethane PU-2), its performance test results are shown in Table 1.
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