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Controllable self-crimping polyurethane film as well as preparation and application thereof

A polyurethane film and self-curling technology, applied in the field of smart materials, can solve the problems of increased risk, no self-curling performance, loss, etc., and achieve the effects of avoiding peeling, wide applicability, and simple preparation method

Active Publication Date: 2019-05-07
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But to remove the nanoparticles requires the use of highly corrosive hydrofluoric acid, which requires the polymer to be corrosion resistant and increases the risk of handling
In addition, when this method is used for the preparation of softer polymer films, the removal of nanoparticles tends to cause the collapse of the porous structure, and the material loses its two-layer structure without self-curling properties.

Method used

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  • Controllable self-crimping polyurethane film as well as preparation and application thereof
  • Controllable self-crimping polyurethane film as well as preparation and application thereof
  • Controllable self-crimping polyurethane film as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 A controllable self-curling polyurethane film, which is composed of a polyurethane layer and a polyurethane-silica nanosphere composite layer, with a thickness of 30 μm. The polyurethane-silica nanosphere composite layer accounts for 50% of the total thickness of the membrane material.

[0028] Its preparation method refers to: dissolving 10 parts by weight of solid polyurethane prepared by conventional methods in 90 parts by weight of N,N-dimethylformamide (DMF) to obtain a uniform polyurethane solution with a mass concentration of 10%. ; After adding 30% of its mass of silicon dioxide nanospheres to the polyurethane solution, stir it with magnets for 18 hours at room temperature and in an air atmosphere to obtain a mixed solution, pour the mixed solution into a mold, and heat up to 80° C. in a vacuum oven. Vacuum is 10 -1 Pa, keep it for 4 hours to complete the solvent volatilization, and obtain the polyurethane film.

[0029] Wherein: silica nanospheres r...

Embodiment 2

[0031] Example 2 A controllable self-curling polyurethane film, which is composed of a polyurethane layer and a polyurethane-silicon dioxide nanosphere composite layer, with a thickness of 80 μm. The polyurethane-silica nanosphere composite layer accounts for 70% of the total thickness of the membrane material.

[0032] Its preparation method refers to: dissolving 20 parts by weight of solid polyurethane prepared by conventional methods in 80 parts by weight of N-methylpyrrolidone (NMP) to obtain a uniform polyurethane solution with a mass concentration of 20%; in the polyurethane solution After adding 60% of its mass of silica nanospheres, stir for 12 hours under normal temperature and air atmosphere to obtain a mixed solution, pour the mixed solution into a mold, and heat up to 100°C in a vacuum oven with a vacuum degree of 10Pa , keep 2h to complete the solvent volatilization, that is, the polyurethane film.

[0033] Wherein: silica nanospheres refer to monodisperse nanosp...

Embodiment 3

[0035] Example 3 A controllable self-curling polyurethane film, which is composed of a polyurethane layer and a polyurethane-silicon dioxide nanosphere composite layer, with a thickness of 50 μm. The polyurethane-silica nanosphere composite layer accounts for 60% of the total thickness of the membrane material.

[0036] Its preparation method refers to: dissolving 15 parts by weight of solid polyurethane prepared by conventional methods in 85 parts by weight of N,N-dimethylformamide (DMF) to obtain a uniform polyurethane solution with a mass concentration of 15%. ; After adding 40% of its mass of silicon dioxide nanospheres to the polyurethane solution, stir it with magnets for 20 hours at room temperature and in an air atmosphere to obtain a mixed solution, pour the mixed solution into a mold, and heat up to 50° C. in a vacuum oven. The degree of vacuum is 1Pa, keep it for 10h to complete the solvent volatilization, and obtain the polyurethane film.

[0037] Wherein: silica ...

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Abstract

The invention relates to a controllable self-crimping polyurethane film. The polyurethane film is composed of a polyurethane layer and a polyurethane-silicon dioxide nanosphere composite layer, and has a thickness of 30-80 [mu]m, wherein the polyurethane-silicon dioxide nanosphere composite layer accounts for 50%-90% of the total thickness of film material. The invention also discloses a preparation method and application of the polyurethane film. The method provided by the invention adopts a single polymer to prepare a similar double-layer structure, solves the problem that interface bondingforce is weak in two polymers, and avoids peeling of the two-layer structure; and the self-crimping behavior is adjusted and controlled by adjusting a ratio of a swelling medium to a non-swellable medium to obtain a self-crimping structure of different shapes and sizes, and the application of the material as a driver can be realized.

Description

technical field [0001] The invention relates to the technical field of intelligent materials, in particular to a controllable self-curling polyurethane film and its preparation and application. Background technique [0002] Self-curling refers to the behavior that a material can respond to curling under external stimuli. This phenomenon exists widely in nature. For example, pine cones will automatically open and close as the humidity changes. There are different degrees of swelling in water, so the pinecone leaves swell asymmetrically with changes in humidity, allowing them to open and close. Inspired by this, in order to prepare a structure similar to this, two polymers with different swelling properties are used to construct a double-layer polymer film, which can achieve self-curling properties, thereby being used for drug release, drivers, etc. [CN 108744048 A , EP2423162-A1]. However, when using this method, the interface formed between two different polymers is likel...

Claims

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Application Information

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IPC IPC(8): C08L75/04C08K7/18C08K3/36C08J5/18C08J7/02
Inventor 张耀明陶立明杨增辉王齐华王廷梅
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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