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A method for regulating the microporous structure of polylactic acid membranes by in-situ polymerization of bifunctional monomers

A bifunctional, in-situ polymerization technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as insufficient interaction force and achieve good hydrophilicity

Active Publication Date: 2017-09-19
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

However, due to the incomplete compatibility between the additive and the polymer, or the interaction between the two is not strong enough, the additive will migrate out with the solvent during the solvent-non-solvent exchange process.

Method used

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  • A method for regulating the microporous structure of polylactic acid membranes by in-situ polymerization of bifunctional monomers
  • A method for regulating the microporous structure of polylactic acid membranes by in-situ polymerization of bifunctional monomers
  • A method for regulating the microporous structure of polylactic acid membranes by in-situ polymerization of bifunctional monomers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] At a temperature of 80°C and an air humidity of 70%, in a three-necked flask, dissolve 18g of polylactic acid in 82g of N-methylpyrrolidone, and stir the mixture at a stirring speed of 240 rpm for a stirring time of After 12 hours, a film-forming precursor solution containing 18wt% polylactic acid was obtained. Nitrogen was blown into the film-forming precursor solution, 4 grams of glycidyl methacrylate (GMA) was added, and 0.04 grams of azobisisobutyronitrile was added to the flask half an hour later to allow in-situ polymerization to occur. After reacting for 36 hours, the nitrogen gas was cut off and the air was blown in to terminate the reaction. Under the condition of keeping 80° C., the polylactic acid casting solution was obtained by standing still for 8 hours. At a room temperature of 25°C and an indoor humidity of 70%, the casting solution was evenly poured on a glass plate, then immediately transferred to a deionized water coagulation bath at 25°C, and solidi...

Embodiment 2

[0028] At a temperature of 85°C and an air humidity of 70%, in a three-necked flask, dissolve 20 grams of polylactic acid in 80 grams of N-methylpyrrolidone, and stir the mixture at a stirring speed of 440 rpm. For 12 hours, a film-forming precursor solution containing 20wt% polylactic acid was obtained. Nitrogen was blown into the film-forming precursor solution, 8 grams of glycidyl methacrylate (GMA) was added, and 0.08 grams of azobisisobutyronitrile was added to the flask half an hour later to allow in-situ polymerization to occur. After reacting for 24 hours, the nitrogen gas was cut off and the air was blown in to terminate the reaction. Under the condition of maintaining 85° C., the polylactic acid casting solution was obtained by standing still for 8 hours. At a room temperature of 25°C and an indoor humidity of 70%, the casting solution was evenly poured on a glass plate, then immediately transferred to a deionized water coagulation bath at 30°C, and solidified to fo...

Embodiment 3

[0031] At a temperature of 78°C and an air humidity of 70%, in a three-necked flask, dissolve 17 grams of polylactic acid in 83 grams of N-methylpyrrolidone, and stir the mixture at a stirring speed of 240 rpm. For 12 hours, a film-forming precursor solution containing 17wt% polylactic acid was obtained. Nitrogen was blown into the film-forming precursor solution, 6 grams of glycidyl methacrylate (GMA) was added, and 0.06 grams of azobisisobutyronitrile was added to the flask half an hour later to allow in-situ polymerization to occur. After reacting for 30 hours, the nitrogen gas was cut off and the air was blown in to terminate the reaction. Under the condition of keeping 78° C., the polylactic acid casting solution was obtained by standing still for 8 hours. At a room temperature of 25°C and an indoor humidity of 70%, the casting solution was uniformly poured on a glass plate, then immediately transferred to a deionized water coagulation bath at 20°C, and solidified to for...

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Abstract

The invention discloses a method for regulating the micropore structure of a polylactic acid porous membrane through an in-situ polymerization method. In the method of the present invention, polylactic acid is first dissolved in an organic solvent, and after fully dissolving, a film-forming precursor solution is prepared; under nitrogen protection, a bifunctional monomer and an initiator are added to the film-forming precursor solution for in-situ polymerization, and the reaction ends After standing still for defoaming, the casting solution is obtained. The casting solution is poured onto a glass plate to obtain a nascent film, which is then immediately transferred to a deionized water bath, and after immersion for a certain period of time, a shaped polylactic acid film is obtained. By controlling the time of in-situ polymerization, the structure of the support layer of the PLA membrane can gradually change from a finger-like macroporous structure to a complete interpenetrating network structure, which has high flux, high-efficiency selective permeation and good hydrophilicity, and is suitable for As a hemodialysis membrane, it is used to separate medium molecular weight uremic solutes while retaining large molecular weight proteins.

Description

technical field [0001] The invention relates to the technical field of polymer material dialysis membranes, in particular to a polylactic acid membrane with an interpenetrating network microporous structure prepared by in-situ polymerization. Background technique [0002] Polylactic acid is obtained from corn, wheat, sugar beet and other starchy agricultural products, which are fermented to produce lactic acid and then polycondensed. Its raw materials are renewable, and its waste can be naturally degraded into carbon dioxide and water in nature, without causing any pollution to the environment. In addition, PLA is relatively inexpensive compared to fluorocarbon polymers and polysulfones. Therefore, the preparation of polylactic acid porous separation membranes by phase separation has gradually attracted people's attention. However, the current research on polylactic acid membranes is still focused on the mechanism analysis of its phase inversion process. The microporous st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/48B01D67/00B01D69/02
Inventor 薛立新高爱林朱丽静傅寅翼
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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