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

Inactive Publication Date: 2019-06-14
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, the polyurethane elastomer prepared by it still has low tensile strength, elastic modulus, elongation at break and shape recovery rate.
Moreover, the current polyurethane-based shape memory polymers have poor rigidity and elasticity when stretched, and at the same time, the temperature of variable temperature adjustment is relatively narrow, which limits its application.

Method used

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  • Polyurethane with shape memory function and preparation method thereof
  • Polyurethane with shape memory function and preparation method thereof
  • Polyurethane with shape memory function and preparation method thereof

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preparation example Construction

[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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Abstract

The invention discloses a polyurethane with a shape memory function and a preparation method thereof. The preparation method comprises the following steps: preparing polyurethane prepolymer through reaction of a first mixed reaction system including polycaprolactone diol, diisocyanate, catalyst and organic solvent; triggering reaction of a second mixed reaction system including polyurethane prepolymer, chain extender and organic solvent; curing the acquired reaction product, thereby acquiring polyurethane. The chain extender includes 1,4-butanediol. The preparation method is simple and convenient in operation; the synthesis process is high-efficient; the prepared polyurethane is high in strength, high in tensile strength and wide in adjustable temperature range and has excellent thermal, mechanical and triple shape memory performances; compared with the traditional polycaprolactone-based shape memory polyurethane material, the polyurethane has the advantages that the tensile strength is increased to 8.0-18.0MPa, elasticity modulus is increased by 1-2 times, elongation at break reaches up to 500-600% and shape recovery rate reaches up to 85-99%.

Description

technical field [0001] The invention belongs to the technical field of intelligent polymer materials, in particular to a polyurethane with shape memory function and a preparation method thereof. Background technique [0002] Compared with shape memory materials, such as shape memory alloys, shape memory polymers (SMP) have a wide range of application values ​​in the aerospace field because of their low cost, light weight, large deformation and strong plasticity. , shape memory polymers can be used for space environment assessment, as components of space unfolding structures, such as hinges, antennas, wheels of lunar exploration vehicles, etc.; in addition, SMP materials realize the shape memory effect through the control of molecular structure and vitrification characteristics , and because of its good biocompatibility, degradability and other advantages, it has a wide range of applications in the field of biomedical materials such as surgical sutures, cardiac stents, tissue...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/32C08G18/10
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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