Shape memorizing polyurethane and preparation method thereof

A polyurethane and polyurethane prepolymer technology, which is applied in the field of shape memory polyurethane and intelligent polymer materials, can solve the problems of restricting wide application, low shape fixation rate and shape recovery rate, and non-cheap raw materials, so as to achieve high efficiency in the synthesis process and preparation The method is easy to operate, and the effect of excellent triple shape memory performance and mechanical tensile performance

Active Publication Date: 2019-06-21
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its raw materials are not cheap and easy to obtain, which limits its wide application in industrial production
[0006] Therefore, the thermally induced shape memory polyurethane in the prior art has problems such as low shape fixation rate and shape recovery rate, poor shape memory effect, and cannot be widely used.

Method used

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  • Shape memorizing polyurethane and preparation method thereof
  • Shape memorizing polyurethane and preparation method thereof
  • Shape memorizing polyurethane and preparation method thereof

Examples

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preparation example Construction

[0021] A method for preparing shape-memory polyurethane provided by an aspect of the embodiments of the present invention includes:

[0022] reacting the first mixed reaction system comprising polycaprolactone diol, diisocyanate, catalyst and organic solvent to prepare a polyurethane prepolymer; and

[0023] The second mixed reaction system comprising the polyurethane prepolymer, the helical non-planar chain extender or the planar chain extender and the organic solvent is reacted, and then the obtained reaction product is solidified to obtain the shape memory polyurethane.

[0024] 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.

[0025] In some embodiments, the polycaprolactone diol has a weight average molecular weight of 1000-5000.

[...

Embodiment 1

[0047] refer to figure 1 As shown, put 5.00 g of polycaprolactone diol with a molecular weight of 1000 into a round bottom flask, add 2.62 g of dicyclohexyl diisocyanate (HMDI), and then add 20 ml of tetrahydrofuran (THF) and 1% eqv of di Dibutyltin laurate reacted with microwave at 60°C for 45min to obtain a polyurethane prepolymer. The amount of chain extender formula II b added was determined to be 1.36g by acetone-di-n-butylamine titration, and 15ml of N,N-dimethyl Dimethyl formamide (DMF), microwaved at 70°C for 60min, and finally poured into a mold preheated at 80°C, cured in a vacuum oven at 80°C for 16h, and the shape memory polyurethane (marked as polyurethane PU-1) was obtained , and its performance test results are shown in Table 1.

[0048] Please refer to the FT-IR figure of the shape memory polyurethane obtained in this embodiment figure 2 , the shape memory curve (DMA) diagram see image 3 .

Embodiment 2

[0050] 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 dichloroethane and 1% eqv of dilauric acid Dibutyltin reacted with microwave at 60°C for 45 minutes to obtain a prepolymer of polyurethane. The acetone-di-n-butylamine titration method determined that the amount of chain extender formula II b added was 1.38 g, and 15 ml of N,N-dimethylformaldehyde was added Amide (DMF), microwaved at 70°C for 60min, and finally poured into a mold preheated at 60°C, cured in a vacuum oven at 80°C for 14h, and the shape memory polyurethane (marked as polyurethane PU-2) was obtained. The performance test results are shown in Table 1.

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Abstract

The invention discloses shape memorizing polyurethane and a preparation method thereof. The preparation method comprises the following steps: reacting a first mixing reaction system which is composedof polycaprolactone diol, diisocyanate, a catalyst and an organic solvent to obtain a polyurethane prepolymer; reacting a second mixing reaction system which is composed of the polyurethane prepolymer, a spiral nonplanar chain extender or a planar chain extender and an organic solvent; and curing the reaction product to obtain the shape memorizing polyurethane. The preparation method is simple andconvenient to operate, and efficient in synthesizing process; the prepared shape memorizing polyurethane is outstanding in triple shape memorizing performance and mechanical stretching performance; the elongation at break of the polyurethane is 500-600%; the stretching strength is 15-20MPa; the thermal decomposition beginning temperature is 280-320 DEG C; the secondary circular shape fixing ratein a shape memorizing curve is 91-99%, and the secondary circular shape recovery rate is beyond 95-99%.

Description

technical field [0001] The invention belongs to the technical field of shape-memory polyurethane and intelligent polymer materials, in particular to a method for preparing shape-memory polyurethane by using a helical non-planar or planar chain extender. Background technique [0002] Shape memory polymer (SMP) is an intelligent polymer material, which realizes the shape memory effect mainly through the control of molecular structure and vitrification characteristics. SMP materials have low cost, light weight, large deformation and plasticity. Strong and other characteristics, and has the advantages of good biocompatibility and degradability, such polyurethane smart materials have broad potential application prospects in the field of biomedical materials. [0003] Shape memory polyurethane (SMPU) generally has a two-phase structure, that is, a stationary phase and a reversible phase. The hard segment of the polyurethane forms a stationary phase through hydrogen bonding or crys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/10C08G18/32
Inventor 罗清陈景那海宁潘宝海乔颖朱锦
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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