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Preparation method for polylactic acid porous shape memory film

A polylactic acid and pore shape technology, applied in the field of polymer materials, can solve the problems of long production cycle, limited production volume, complicated preparation process, etc., and achieve the effects of short production cycle, good shape memory performance and ductility

Active Publication Date: 2017-08-25
HANGZHOU NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] According to the literature, polylactic acid is usually compounded with other polymers as a shape memory material containing polylactic acid or a porous material, but there are basically no relevant reports on pure polylactic acid porous shape memory materials
On the other hand, most of the methods for preparing shape memory materials involve organic synthesis (to form fixed points or synthesize soft / hard block substances to provide shape memory properties), the preparation process is relatively cumbersome, the production cycle is long, and the production volume is limited.

Method used

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  • Preparation method for polylactic acid porous shape memory film
  • Preparation method for polylactic acid porous shape memory film
  • Preparation method for polylactic acid porous shape memory film

Examples

Experimental program
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Embodiment 1

[0032] Embodiment 1: 1) take by weighing 2.0 grams of polylactic acid and 2.0 grams of polyethylene oxide and dissolve in 50 milliliters of chloroform, stir for 12 hours with a magnet, and make the mass ratio of polylactic acid / polyethylene oxide be 1 / 1 , a polymer solution with a mass fraction of 8%; a polylactic acid / polyethylene oxide film was prepared at room temperature using a 2 μm wiper using a polyethylene film as a substrate.

[0033] 2) After placing the film in the air for 30 minutes, soak it in distilled water at room temperature for 48 hours, replace the distilled water every 12 hours, and etch the polyethylene oxide in the film. The etched film was placed in a vacuum oven and dried under vacuum conditions at room temperature for 12 hours to remove moisture in the film, and finally a polylactic acid porous shape memory film was obtained. After the above-mentioned finally obtained thin film was sprayed with gold, it was detected by a scanning electron microscope, a...

Embodiment 2

[0034] Embodiment 2: 1) take by weighing 2.0 grams of polylactic acid and 2.0 grams of polyethylene oxide and be dissolved in 50 milliliters of chloroform, magnetic sub-stirring 12 hours, the mass ratio that makes polylactic acid / polyethylene oxide is 1 / 1 , a polymer solution with a mass fraction of 8%; a polylactic acid / polyethylene oxide film was prepared at room temperature using a 22 μm wiper using a polyethylene film as a substrate.

[0035] 2) After placing the film in the air for 30 minutes, soak it in distilled water at room temperature for 48 hours, replace the distilled water every 12 hours, etch the polyethylene oxide in the film. The etched film was placed in a vacuum oven and dried under vacuum conditions at room temperature for 12 hours to remove moisture in the film, and finally a polylactic acid porous shape memory film was obtained. After the above-mentioned finally obtained thin film was sprayed with gold, it was detected by a scanning electron microscope, an...

Embodiment 3

[0036] Embodiment 3: 1) take by weighing 2.0 grams of polylactic acid and 2.0 grams of polyethylene oxide and be dissolved in 50 milliliters of chloroform, magnetic sub-stirring 12 hours, the mass ratio that makes polylactic acid / polyethylene oxide is 1 / 1 , a polymer solution with a mass fraction of 8%; a polylactic acid / polyethylene oxide film was prepared at room temperature using a 52 μm wiper on a polyethylene film substrate.

[0037]2) After placing the film in the air for 30 minutes, soak it in distilled water at room temperature for 48 hours, replace the distilled water every 12 hours, and etch the polyethylene oxide in the film. The etched film was placed in a vacuum oven and dried under vacuum conditions at room temperature for 12 hours to remove moisture in the film, and finally a polylactic acid porous shape memory film was obtained. After the above-mentioned finally obtained thin film was sprayed with gold, it was detected by a scanning electron microscope, and the...

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Abstract

The invention discloses a preparation method for a polylactic acid porous shape memory film. The polylactic acid porous shape memory film in the invention is formed under the synergic effect of crystallization and phase separation. The method specifically comprises the following steps: dissolving polylactic acid and polyethylene oxide at a certain weight ratio in a co-solvent, and stirring under room temperature, thereby forming a homogeneous polymer solution; scraping the polymer solution into a film by using film scrapers of different thickness; etching a polyethylene oxide phase in the film; after etching, placing the film into a vacuum oven and drying, thereby acquiring the biodegradable polylactic acid porous shape memory film. The polylactic acid porous shape memory film has a micron-scale penetrated porous structure and a shape memory property. The sizes of formed holes are correspondingly changed according to different film thickness, and meanwhile, the polylactic acid porous shape memory film macroscopically and microscopically has better shape memory effect and is expected to be applied to the fields of separation filtering, medical materials, and the like.

Description

technical field [0001] The invention relates to the technical field of polymer materials, and relates to a method based on the combination of crystallization and phase separation to prepare a polylactic acid porous shape memory film. Background technique [0002] Porous shape memory materials (SMPs) include foams, scaffolds, meshes, and porous polymers with three-dimensional macrostructures. [0003] Compared with traditional bulk shape memory materials, porous shape memory materials not only combine the characteristics of light weight and large specific surface area of ​​porous materials, but also derive their unique advantages, such as porous structure can make heat transfer faster and more uniform Avoid temperature gradients in the thickness direction; a pore structure of a certain size has a toughening effect on the material; the most prominent point is that the shape and size of the pores also have shape memory properties. These advantages have a significant impact on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/26C08L71/02C08L67/04
CPCC08J9/26C08J2201/0464C08J2367/04C08J2371/02C08J2467/04C08J2471/02
Inventor 李勇进由吉春杨邱程赵婧馨
Owner HANGZHOU NORMAL UNIVERSITY
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