A preparation method for constructing superhydrophobic interface of polylactic acid film based on stereocomplex crystal

A technology of polylactic acid film and stereocomposition, applied in the field of bionic interface, can solve the problems of not achieving high and low adhesion, expensive, limited to small size, etc.

Active Publication Date: 2018-09-25
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The phase inversion method overcomes the problems of the template replication method and the surface etching method, that is, the steps are cumbersome, expensive, limited to small sizes, etc.
At present, polymers that can generate micro-nano and patterns during the phase inversion process are relatively rare, and only the surface with the "lotus leaf effect" has been obtained, and the surface with the "petal effect" has not been obtained, let alone high and low adhesion. controllable transformation
In addition, the surface of polylactic acid membrane is usually more hydrophilic, and the surface of hydrophobicity is rarely reported.

Method used

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  • A preparation method for constructing superhydrophobic interface of polylactic acid film based on stereocomplex crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step (1). Dissolve 9.6 g of L-polylactic acid and 6.4 g of D-polylactic acid (16 g in total) in 84 g of methylpyrrolidone, and stir at 80° C. for 12 h at a stirring speed of 200 rpm to obtain a uniform initial casting solution;

[0025] Step (2). Vacuum and defoaming the obtained initial film casting solution, then pour it on a clean and clean ground glass surface, scrape it with a scraper to make a 100 μm thick primary film, and immerse the primary film in 25°C coagulation bath pure water within 10s , immersed for 10min to fully precipitate the polylactic acid;

[0026] Step (3). The fully cured polylactic acid film in step (2) is peeled off from the ground glass, soaked in deionized water for 24h, the residual solvent is removed, and then air-dried for later use;

[0027] The polylactic acid film obtained under this condition has a hydrophobic contact angle of 148o on the side in contact with the glass plate, and the adhesion to water droplets is 140μN.

[0028] The ...

Embodiment 2

[0030] Step (1). Dissolve 12.6g L-polylactic acid and 5.4g D-polylactic acid (18g in total) in 82g dimethylacetamide, stir at 85°C for 14h, and the stirring speed is 120rpm to obtain a uniform initial cast film liquid;

[0031] Step (2). Vacuuming and defoaming the obtained initial film casting solution, then pouring it on a clean and clean ground glass surface, scraping with a scraper to make a 200 μm thick primary film, and immersing the primary film in a coagulation bath at 15°C within 10s, The coagulation bath is a mixture of water / methylpyrrolidone, with a volume ratio of 9:1, and immersed for 35 minutes to fully precipitate the polylactic acid;

[0032] Step (3). The fully cured polylactic acid film in step (2) is peeled off from the ground glass, soaked in deionized water for 24h, the residual solvent is removed, and then air-dried for later use;

[0033] The polylactic acid film obtained under this condition has a hydrophobic contact angle of 149o on the side in conta...

Embodiment 3

[0035] Step (1). Dissolve 14.4g L-polylactic acid and 3.6g D-polylactic acid (18g in total) in 82g methylpyrrolidone / dimethylacetamide mixed solvent, stir at 75°C for 8h, and the stirring speed is 220rpm, Obtain a uniform initial casting solution;

[0036] Step (2). Vacuuming and defoaming the obtained initial film casting solution, then pouring it onto a clean and clean ground glass surface, scraping with a scraper to make a 300 μm thick primary film, immersing the primary film in a coagulation bath at 28°C within 10s, The coagulation bath is a mixture of water / methylpyrrolidone, with a volume ratio of 8:2, and immersed for 40 minutes to fully precipitate the polylactic acid;

[0037] Step (3). The fully cured polylactic acid film in step (2) is peeled off from the ground glass, soaked in deionized water for 24h, the residual solvent is removed, and then air-dried for later use;

[0038] The polylactic acid film obtained under this condition had a hydrophobic contact angle o...

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Abstract

The invention relates to a preparation method for constructing a polylactic acid film super-hydrophobic interface based on stereocomplex crystals. A super-hydrophobic surface has wide application in real life. A super-hydrophobic surface with extremely low adhesion force to liquid drops, such as a lotus leaf surface, has a self-cleaning function; a super-hydrophobic surface with extremely strong adhesion force to the liquid drops, such as a roseleaf surface, is frequently used in transporting of trace liquid drops. The chemical components and roughness of a material surface are key factors affecting the infiltration performance of the interface. For a certain limited material, the hydrophobicity is often improved in a way of constructing a multi-scale micro-nano structure on the surface. The stereocomplex crystals can be formed by using L-polylactic acid and R-polylactic acid, and the phenomena that micron scale spheres and nano-scale grooves are formed in a solvent inducing phase inversion process; the multi-scale micro-nano structure is constructed on the surface of a polylactic acid film, and thus the super-hydrophobic polylactic acid film interface with controllable adhesion force is obtained.

Description

technical field [0001] The invention belongs to the technical field of bionic interfaces, and relates to a preparation method for constructing a surface of a polylactic acid film with super-hydrophobicity and controllable adhesion based on a stereocomposite crystal. Background technique [0002] There are many biological surfaces with special wetting properties in nature. The surface of the lotus leaf is widely known. Water droplets fall on the surface and roll off quickly, showing a self-cleaning effect, which is called the "lotus leaf effect". Different from this, the surface of rose petals has strong adhesion to water droplets, raindrops fall on the surface of the petals, keep the shape of the water droplets and firmly adhere to the surface of the petals, shine in the sun, attract bees and butterflies, which is called "petal effect". ". In addition to the surface of lotus leaves and petals, rice leaves, locust leaves, water strider legs, gecko feet, etc. all show specia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L67/04
CPCC08J5/18C08J2367/04C08J2467/04C08L67/04C08L2203/16C08L2205/025
Inventor 薛立新高爱林赵永青傅寅翼
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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