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Surface modification method for polyether sulfone filter membrane

A surface modification, polyethersulfone technology, applied in the field of anti-adhesion polyethersulfone filter membrane modification, can solve the problems of complex preparation method, expensive polyethersulfone sulfonation, harsh process conditions, etc. Improved anti-protein adhesion properties and mild reaction conditions

Inactive Publication Date: 2018-05-18
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By blending sulfonated polyethersulfone and polyethersulfone to form a membrane, a polyethersulfone separation membrane with good hydrophilicity can be obtained, which has been applied in engineering. The disadvantage is that polyethersulfone sulfonation is expensive, Harsh process conditions
The usual solution is to initiate the surface polymerization of sulfonic acid or carboxylic acid betaine monomers on the surface of the separation membrane, or cross-link polymerization of phosphorylcholine monomers and other monomers. The defect of this approach is that it is necessary to synthesize various amphoteric Ionic monomers, the preparation method is complicated, resulting in high prices of zwitterionic monomers, especially phosphorylcholine monomers are very expensive

Method used

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  • Surface modification method for polyether sulfone filter membrane
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A polyethersulfone filter membrane (8 cm x 8 cm) was placed in a plasma chamber (diameter 30 cm, height 20 cm, effective treatment area 10 cm x 10 cm). Vacuum, and then ventilate until the air pressure reaches 0.1 Pa. Turn on the power of the plasma equipment (power 50w, radio frequency 13.56MHz), wait for uniform purple plasma to appear, and treat the film surface for 5min. The filter membrane was allowed to stand in air for 10 min.

[0041] The filter membrane after plasma treatment was immersed in 0.4 mol / L glycidyl methacrylate solution, and the solvent was a mixed solution of water and ethanol (V:V=50:50). Nitrogen was used to remove the air in the reaction system, and then the temperature of the system was raised to 60 degrees centigrade. The temperature was kept constant and the surface-initiated graft polymerization of glycidyl methacrylate was carried out under stirring conditions, and the reaction was terminated after 4 hours. Fully wash with deionized water...

Embodiment 2

[0047] A polyethersulfone filter membrane (8 cm x 8 cm) was placed in a plasma chamber (diameter 30 cm, height 20 cm, effective treatment area 10 cm x 10 cm). Vacuum, and then ventilate until the air pressure reaches 1 Pa. Turn on the power of the plasma equipment (power 50w, radio frequency 13.56MHz), wait for uniform purple plasma to appear, and treat the film surface for 10min. The filter membrane was left to stand in the air for 20min.

[0048] The filter membrane after plasma treatment was immersed in 0.8 mol / L glycidyl methacrylate solution, and the solvent was a mixed solution of water and ethanol (V:V=50:50). Nitrogen was used to remove the air in the reaction system, and then the temperature of the system was raised to 60 degrees centigrade. The temperature was kept constant and the surface-initiated graft polymerization of glycidyl methacrylate was carried out under stirring conditions, and the reaction was terminated after 4 hours. Fully wash with deionized water,...

Embodiment 3

[0052] A polyethersulfone filter membrane (8 cm x 8 cm) was placed in a plasma chamber (diameter 30 cm, height 20 cm, effective treatment area 10 cm x 10 cm). Vacuum, and then ventilate until the air pressure reaches 0.05 Pa. Turn on the power of the plasma equipment (power 50w, radio frequency 13.56MHz), wait for uniform purple plasma to appear, and treat the film surface for 5min. The filter membrane was allowed to stand in air for 10 min.

[0053] The filter membrane after plasma treatment was immersed in 1mol / L glycidyl methacrylate solution, and the solvent was a mixed solution of water and ethanol (V:V=50:50). Nitrogen was used to remove the air in the reaction system, and then the temperature of the system was raised to 60 degrees centigrade. The temperature was kept constant and the surface-initiated graft polymerization of glycidyl methacrylate was carried out under stirring conditions, and the reaction was terminated after 4 hours. Fully wash with deionized water, ...

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Abstract

The invention discloses a surface modification method for a polyether sulfone filter membrane. The polyether sulfone filter membrane is treated by plasma, graft polymerization of glycidyl methacrylateon the membrane surface is triggered, then an epoxide ring opening reaction is triggered between the treated membrane and amino acid under a weakly basic condition, and the polyether sulfone filter membrane with the surface modified with amino acid zwitterions is obtained. The method has the advantages that the process is simple, the conditions are mild, and hydrophilicity and protein adhesion resistance of the polyether sulfone filter membrane are improved remarkably.

Description

technical field [0001] The invention belongs to the technical field of functional polymer materials, and in particular relates to a method for modifying an anti-adhesion polyethersulfone filter membrane. Background technique [0002] Polyethersulfone is an excellent separation membrane material, which has the advantages of high mechanical strength, good physical and chemical stability, excellent film-forming properties, low cost and easy availability, etc. It has been widely used in many filtration fields such as water treatment and biological separation. However, polyethersulfone has strong hydrophobicity, which can easily cause a large amount of protein and microorganisms to adsorb on the surface of the porous separation membrane, thereby blocking the membrane pores, causing serious membrane fouling, resulting in a decrease in membrane separation efficiency and affecting the service life of the separation membrane. [0003] It is an important way to improve the performance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D71/68B01D67/00
CPCB01D67/0093B01D71/68B01D71/82
Inventor 李新松刘小九
Owner SOUTHEAST UNIV
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