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Cross-linking type shape memory polyurethane

A cross-linked, polyurethane technology, applied in the field of polymer material preparation, can solve the problem of low cross-linking density of memory polyurethane, and achieve the effects of good shape fixation rate, fast recovery response speed and good repeatability

Active Publication Date: 2012-11-21
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The crosslinked shape memory polyurethane prepared with glycerol as the chain extender has better strength than the linear shape memory polyurethane, but the shape memory polyurethane prepared by this crosslinking method has a lower crosslinking density

Method used

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  • Cross-linking type shape memory polyurethane
  • Cross-linking type shape memory polyurethane
  • Cross-linking type shape memory polyurethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1). In N 2 Under protection, add MDI to a three-necked flask equipped with a stirrer, put the three-necked flask into an oil bath and heat to 80°C, and then add dehydrated 1,4-dioxane with a mass fraction of 25 % PCL solution, mechanically stirred and reacted for 3 hours to prepare an MDI-terminated polyurethane prepolymer; cool the obtained MDI-terminated polyurethane prepolymer to 25°C, add γ-aminopropyltriethoxysilane to carry out React for 1 hour to obtain a polyurethane prepolymer terminated with silicon ethoxy groups; wherein: the molar ratio of PCL: MDI: γ-aminopropyltriethoxysilane is 1: 1.8: 1;

[0039] (2). Place the silicon ethoxy-terminated polyurethane prepolymer obtained in step (1) directly at room temperature for chain extension and cross-linking reaction for 12 hours, and dry to obtain a film of cross-linked polyurethane; place it at room temperature for one week to obtain a dense structure cross-linked shape memory polyurethane. Tensile test of this...

Embodiment 2

[0041] (1). With step (1) in embodiment 1;

[0042] (2). Add aqueous HCl solution to the polyurethane prepolymer obtained in step (1), where: γ-aminopropyltriethoxysilane: HCl: H 2 The molar ratio of O is 1:0.05:3. After stirring evenly, carry out the hydrolysis chain extension crosslinking reaction at room temperature for 12 hours, and dry to obtain a crosslinked polyurethane film; Film of cross-linked shape memory polyurethane. Tensile test of this cross-linked shape memory polyurethane, the shape fixation rate (R f ) is 100%, the shape recovery rate (R r ) is 100%. The SEM photo of its cross-section is shown in figure 1 .

Embodiment 3

[0044] (1). With step (1) in embodiment 1;

[0045] (2). Add aqueous HCl solution to the polyurethane prepolymer obtained in step (1), where: γ-aminopropyltriethoxysilane: HCl: H 2 The molar ratio of O is 1:0.05:35. After stirring evenly, carry out the hydrolytic chain extension cross-linking reaction at room temperature for 36 hours, and dry to obtain a cross-linked polyurethane film; A cross-linked shape memory polyurethane with a porous structure of micropores. Tensile test of this cross-linked shape memory polyurethane, the shape fixation rate (R f ) is 100%, the shape recovery rate (R r ) is 100%. The SEM photo of its cross-section is shown in figure 2 .

[0046] The cross-linked shape-memory polyurethane material with a porous structure of nanopores and micropores prepared in Example 3 and the dense structure shape-memory polyurethane material prepared in Example 2 of the same size were bent to the same shape at 50°C. appearance, and record the recovery process of...

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Abstract

The invention belongs to the technical field of polymer material preparation, and particularly relates to cross-linking type shape memory polyurethane. During the preparation of the cross-linking type shape memory polyurethane (SMPU) with good shape memory performance in the invention, a silane coupling agent containing three alkoxys is introduced into end groups of a polyurethane prepolymer terminated by isocyanate groups; a polyurethane prepolymer terminated by silicon alkoxys is obtained through reactions; then a catalyst is added or not added into the polyurethane prepolymer terminated by silicon alkoxys; and SMPU with good shape memory performance is prepared by silicon alkoxy crosslinking; Through the control of the catalyst amount, SMPU with a dense structure or with a porous structure containing nanometer pores or micrometer pores is respectively prepared. The SMPU has a shape fixing rate (Rf) of not less than 90%, a shape recovery rate (Rr) of not less than 90%. The SMPU with a porous structure containing nanometer pores or micrometer pores has higher recovery response speed.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and in particular relates to a cross-linked shape-memory polyurethane. Background technique [0002] Shape memory materials refer to the stimuli that can perceive environmental changes (such as temperature, force, electromagnetic, solvent, etc.), and adjust their mechanical parameters (such as shape, position, strain, etc.) The material that sets the state. Due to the very important potential application value of shape memory materials in intelligent structures (intelligent structures, or smart structures, smart structures), great progress has been made in the past 20 years, and shape memory materials are also called smart materials. (intelligentmaterials) or smart materials (smart materials). [0003] Shape Memory Polymer (Shape Memory Polymer, SMP) refers to a polymer with an original shape that can be restored to its original shape after being deformed and fixed by exter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/38C08G18/32C08G18/10C08J7/00C08J5/18C08J3/24
Inventor 曹新宇张京楠马永梅张晶晶陈辉玲江雷王佛松
Owner INST OF CHEM CHINESE ACAD OF SCI
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