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Electric field ruggedization assembled method and apparatus of polyelectrolyte complexes membrane

A polyelectrolyte and assembly device technology, which is applied in the field of membrane separation and can solve the problems of poor controllability of the membrane structure

Inactive Publication Date: 2008-04-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in fact, due to the branching, cross-linking, interpenetrating network structure, or ladder structure in the polyelectrolyte chain structure, some polymers have side groups and end groups, these factors will seriously affect the LBL process. The complete "parallel" electrostatic adsorption between the middle layer and the layer, so the layer boundary structure formed is not a completely ordered structure
Therefore, the static and dynamic LBL methods have poor controllability to the membrane structure, and there is still room for further improvement of the membrane performance.

Method used

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  • Electric field ruggedization assembled method and apparatus of polyelectrolyte complexes membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The support membrane is made of polyacrylonitrile (PAN) material, a flat ultrafiltration membrane with a molecular weight cut-off of 20,000 and a membrane area of ​​79cm 2 , the polycation material used is linear polyethyleneimine (PEI, molecular weight is 60,000), and the solvent of polyethyleneimine is absolute ethanol.

[0043] Assembly conditions and methods:

[0044] (1) Polyethyleneimine is made into a 0.5wt% solution with absolute ethanol, and left to defoam;

[0045] (2) In order to charge the surface of the polyacrylonitrile support membrane, conventional hydrolysis modification technology is adopted. Firstly, when the temperature is 65 ° C, the polyacrylonitrile ultrafiltration membrane is immersed in 2N NaOH solution for 30 minutes, and it is modified into Polyanion supported membrane;

[0046] (3) soak the membrane in deionized water, rinse the membrane surface and dry;

[0047] (4) Place the membrane in the membrane chamber, assemble it into an electric ...

Embodiment 2

[0053] The support membrane is made of polyacrylonitrile (PAN) material, a flat ultrafiltration membrane with a molecular weight cut-off of 20,000 and a membrane area of ​​79cm 2 , the polycation material used is linear polyethyleneimine (PEI, molecular weight is 60,000), polyanion is polyacrylic acid (PAA, molecular weight is 4 million), and the solvent of polyethyleneimine and polyacrylic acid is water.

[0054] Assembly conditions and methods:

[0055] (1) Polyacrylic acid is made into a 0.05wt% solution with deionized water, polyethyleneimine is made into a 0.5wt% solution with isopropanol, and left to defoam;

[0056] (2) In order to charge the surface of the polyacrylonitrile support membrane, conventional hydrolysis modification technology is adopted. Firstly, when the temperature is 65 ° C, the polyacrylonitrile ultrafiltration membrane is immersed in 2N NaOH solution for 30 minutes, and it is modified into Polyanion supported membrane;

[0057] (3) soak the membrane...

Embodiment 3

[0066] The support membrane is made of polyacrylonitrile (PAN) material, a flat ultrafiltration membrane with a molecular weight cut-off of 20,000 and a membrane area of ​​79cm 2 , the polycation material used is linear polyethyleneimine (PEI, molecular weight is 60,000), and the polyanion is polyacrylic acid (PAA, molecular weight is 4 million).

[0067] Assembly conditions and methods:

[0068] (1) Polyacrylic acid is made into a 0.05wt% solution with deionized water, polyethyleneimine is made into a 0.5wt% solution with isopropanol, and left to defoam

[0069] (2) In order to charge the surface of the polyacrylonitrile support membrane, conventional hydrolysis modification technology is adopted. Firstly, when the temperature is 65 ° C, the polyacrylonitrile ultrafiltration membrane is immersed in 2N NaOH solution for 30 minutes, and it is modified into Polyanion supported membrane;

[0070] (3) soak the membrane in deionized water, rinse the membrane surface and dry;

[...

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Abstract

The invention relates to an electric field strengthening assembly method and a device of a polyelectrolyte compound membrane, and belongs to the membrane separation technical field. The prior multi-layer electrostatic adsorption self assembly method is often required to compound 50 to 60 layers to get good membrane performance, the membrane making procedure is complicated, the period is long, and the adjustable and controllable performance of the membrane structure is poor. The electric field strengthening assembly method and the device induct direct current fields on both sides of a supporting body, during the static adsorption or dynamic filtration polyion liquor process, the polyion is combined with a base through the strengthening of the extra electric field force, and a multi-layer membrane assembly is realized and the orderliness and the regularity of the membrane structure are adjusted and controlled. The pervaporation testing of the front and the rear parts of the electric field strengthening assemble compound membrane shows that the separation factor of the compound membrane is improved, and the testing of an atom force microscope shows that the membrane surface tends to be flat under the strengthening effect of the electric field, and the orderliness and the regularity of the compound membrane are improved.

Description

technical field [0001] The invention relates to an electric field-strengthened assembly method and device for polyelectrolyte composite membranes, which are used to strengthen the assembly of polyelectrolyte composite membranes and regulate their membrane structure under the action of an electric field, and belong to the technical field of membrane separation. Background technique [0002] Polyelectrolyte composites are a class of membrane materials with a wide range of uses, and can be widely used in separation membranes, biosensors, surface modification, medicine and other fields. Polyelectrolyte, also known as polyion, refers to a polymer with many ionizable ionic groups in the main chain or side chain. Polyelectrolytes can be divided into polycations, polyanions, and polymers with dissociative groups with positive and negative charges, that is, amphoteric polymer electrolytes. The polyelectrolyte composite membrane is not only formed by two polymer polyions with opposit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00
Inventor 张国俊纪树兰高学刘忠洲田亮
Owner BEIJING UNIV OF TECH
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