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Cross-linked shape memory polyurethane responsive to magnetic field and/or electric field and preparation method thereof

An electric field response and cross-linking technology, applied in the field of functional materials, can solve problems such as easy local overheating, damage to surrounding biological tissues, and rise in ambient temperature, and achieve the effects of improving mechanical properties, good compatibility and dispersion

Active Publication Date: 2015-05-20
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the common direct use of hot liquid or gas to heat SMP materials will cause the temperature of the surrounding environment to rise and is prone to local overheating. damage, then other external fields, including electricity, magnetism, light, pH value, etc., will stimulate SMP to have better advantages in the application of SMP in the field of biomedicine
[0003] On the other hand, micro- and nano-structured SMP materials can improve the sensitivity and surface specificity of the response of SMP materials, and can regulate their interface properties in a wider range, such as the hydrophilicity and hydrophobicity of materials, biocompatibility, and cell tissue adhesion. properties, etc. However, the research on the micro- and nano-structuring of shape memory materials is still very limited, especially the research on the SMP of the electric field and magnetic field response is still limited to the research on the bulk properties of the material. Magnetic field and / or electric field responsive SMP is not only innovative in material preparation, but also provides more advantages for its application in the field of biomedicine. Interstitial fluid control permeability and other aspects show better regulation performance and application prospects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1). Weigh 1 part by weight of Fe with a particle size of 10-30nm 3 O 4 Nano particles, added to 1,4-dioxane solvent, ultrasonically dispersed to form 5wt% magnetic Fe 3 O 4 Nanoparticle suspension;

[0033] (2). Weigh the solid content to 99 parts by weight (with Fe 3 O 4 The weight part of the nanoparticles is based on the siloxy-terminated polyurethane prepolymer prepared from PCL, MDI and γ-aminopropyltriethoxysilane (PCL: MDI: γ-aminopropyltriethoxysilane) The molar ratio is 1:1.8:1), an aqueous solution of HCl is added to the siloxy-terminated polyurethane prepolymer, where: γ-aminopropyltriethoxysilane: HCl: H 2 The molar ratio of O is 1:0.05:3, stir evenly to obtain a siloxy-terminated polyurethane prepolymer solution with crosslinking ability;

[0034] (3). Add the suspension obtained in step (1) to the siloxy-terminated polyurethane prepolymer solution with crosslinking ability obtained in step (2), sonicate and stir uniformly, and perform hydrolysis at room tempera...

Embodiment 2

[0036] This embodiment is basically the same as embodiment 1, except that the ratio of HCl to water added is: γ-aminopropyltriethoxysilane: HCl: H 2 The molar ratio of O is 1:0.05:35. The reaction time for hydrolysis, chain extension and crosslinking at room temperature is 36 hours. A cross-linked shape memory polyurethane film with a porous structure of nanopores and micropores (03 O 4 The content of nanoparticles is 1 wt%, and the content of cross-linked polyurethane is 99 wt%. The shape recovery rate of the obtained shape memory polyurethane film in an alternating magnetic field of 221kHz and 19.2KA / m is 97% to 98%, and the shape fixation rate is 96% to 98%.

Embodiment 3

[0038] This example is basically the same as Example 1, except that the added catalyst is C 16 H 36 N·OH aqueous solution, the ratio is: γ-aminopropyltriethoxysilane: C 16 H 36 N·OH: H 2 The molar ratio of O is 1:0.01:6, and the magnetic particles added are Fe with a particle size of 30-50nm 3 O 4 Nano particles are used to obtain a cross-linked shape memory polyurethane film with a dense structure that can respond to a magnetic field. Wherein: Fe in the cross-linked shape memory polyurethane that can respond to magnetic field 3 O 4 The content of nanoparticles is 1 wt%, and the content of cross-linked polyurethane is 99 wt%. The shape recovery rate of the obtained shape memory polyurethane film in an alternating magnetic field of 221kHz and 19.2KA / m is 97% to 99%, and the shape fixation rate is 96% to 98%.

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Abstract

The invention relates to function materials, especially to cross-linked shape memory polyurethane responsive to a magnetic field and / or electric field and a preparation method thereof. According to the invention, an inorganic magnetic particle and / or an inorganic conductive particle are used as filling materials, a polyurethane prepolymer terminated by siloxy groups is used as a matrix material, and the inorganic magnetic particle and / or the inorganic conductive particle are uniformly dispersed in the polyurethane material through hydrolysis, chain extension and crosslinking reactions so as to prepare the cross-linked shape memory polyurethane; the content of the inorganic magnetic particle and / or the inorganic conductive particle in the shape memory polyurethane is 1 to 20 wt%, and the content of crosslinked polyurethane is 80 to 99 wt%. The shape memory polyurethane provided by the invention has a nano-pore and micro-pore porous structure or a compact structure. According to the invention, addition of the inorganic magnetic particle and / or the inorganic conductive particle enables the shape memory polyurethane to recover its shape in an alternating magnetic field and / or electric field, so the function of shape memory is conveniently realized.

Description

Technical field [0001] The present invention relates to functional materials, in particular to a cross-linked shape memory polyurethane (SMPU) capable of responding to magnetic fields and / or electric fields and a preparation method thereof. Background technique [0002] Shape memory polymer (SMP) has the advantages of light weight and low price, easy processing, large deformation and corrosion resistance, and has incomparable advantages in biocompatibility and biodegradability. It has been successful in many technical fields. Application, especially in the field of biomedicine, has attracted much attention and attention, and is becoming one of the research hotspots in the field of smart medical materials. However, the common direct use of hot liquid or gas to heat the SMP material will increase the temperature of the surrounding environment and easily overheat locally. When the SMP material implanted in the organism is operated, it is very easy to cause damage to the surrounding ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08L75/08C08L75/06C08K9/04C08K3/22C08K3/04C08K7/00C08K3/34C08J3/24C08G18/38C08G101/00
Inventor 曹新宇张晶晶马永梅张京楠陈辉玲石广钦刘合梅江雷
Owner INST OF CHEM CHINESE ACAD OF SCI
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