A kind of preparation method of polylactic acid porous shape memory film

A pore shape, L-polylactic acid technology, applied in the field of polymer materials, can solve the problems of long production cycle, limited production volume, no relevant reports, etc., and achieve the effects of good shape memory performance and ductility, and short production cycle.
CN107090097BActive Publication Date: 2020-06-16HANGZHOU NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HANGZHOU NORMAL UNIVERSITY
Publication Date
2020-06-16

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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.
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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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