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Method for preparing porous membranes based on selective swelling of block copolymers

A block copolymer and selective technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as by-products, lack of universal applicability, complicated operation process, etc., to achieve high Intensity, ease of handling, results with less use

Active Publication Date: 2012-11-07
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of these two methods need to remove the dispersed phase or part of it in the phase-separated copolymer to form pores, which is not universal, has great limitations, and the operation process is relatively complicated, and by-products will be produced

Method used

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  • Method for preparing porous membranes based on selective swelling of block copolymers
  • Method for preparing porous membranes based on selective swelling of block copolymers
  • Method for preparing porous membranes based on selective swelling of block copolymers

Examples

Experimental program
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Effect test

Embodiment 1

[0029] a) Weigh 0.02 g of polystyrene and poly(2-vinylpyridine) block copolymer (poly(2-vinylpyridine) volume ratio is 25%), dissolve it in 0.98 g of chloroform, and prepare Polymer mass fraction is the solution of 2%;

[0030] b) Take a piece of polyvinylidene fluoride (PVDF) membrane (the membrane area is about 6.25 square centimeters), soak it in water for 1 minute, take it out, and spread it on a smooth glass substrate;

[0031] c) Wipe off the water on the surface of the PVDF membrane, and then take 0.1 ml of the prepared block copolymer solution and apply it evenly on the entire surface of the PVDF membrane;

[0032] d) Place the glass sheet loaded with PVDF film (coated with block copolymer solution) in a vacuum drying oven at 130°C for 20 minutes, then deflate, open the door of the drying oven and turn off the power of the drying oven , so that the natural cooling of the box for 3 hours. Through this step, the block copolymer solution is dried to form a film on the P...

Embodiment 2

[0040] a) Weigh 0.5 g of block copolymer of polymethylstyrene and polydimethylaminoethyl methacrylate (the volume ratio of polydimethylaminoethyl methacrylate is 10%), dissolve it in 0.5 g of toluene, Be prepared as the solution that polymer mass fraction is 50%;

[0041] b) Take a piece of polyethersulfone (PES) membrane (the membrane area is about 6.25 square centimeters), soak it in glycerol for 5 minutes, take it out, and spread it on a smooth glass substrate;

[0042] c) Wipe off the glycerol on the surface of the PES membrane, and then take 0.05 ml of the prepared block copolymer solution and apply it evenly on the entire surface of the PES membrane;

[0043] d) Put the glass sheet loaded with PES film (coated with block copolymer solution) in a vacuum drying oven at 100°C, vacuumize for 30 minutes, then release the air, open the door of the drying oven and turn off the power of the drying oven , so that the natural cooling of the box for 2 hours. After this step, the ...

Embodiment 3

[0048] a) Weigh 0.01 g of polymethyl acrylate and poly(4-vinylpyridine) block copolymer (poly(4-vinylpyridine) volume ratio is 50%), and dissolve it in 0.99 g of dimethyl sulfoxide , to be prepared as a solution with a polymer mass fraction of 1%;

[0049] b) Take a piece of nylon membrane (the membrane area is about 6.25 square centimeters), soak it in silicone oil for 5 minutes, take it out, and spread it on a smooth glass substrate;

[0050] c) Wipe off the silicone oil on the surface of the nylon membrane, and then take 0.2 ml of the prepared block copolymer solution and apply it evenly on the entire surface of the nylon membrane;

[0051] d) Put the glass sheet loaded with nylon membrane (coated with block copolymer solution) in a vacuum drying oven at 160°C, vacuumize for 20 minutes, then release the air, open the door of the drying oven and turn off the power of the drying oven , so that the natural cooling of the box for 10 hours. After this step, the block copolymer...

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Abstract

The invention relates to a method for preparing porous membranes based on selective swelling of block copolymers. The method includes the steps of preparing a block copolymer (a block copolymer is formed by a block A and a block B) solution, preprocessing microfiltration basement membranes, coating the block copolymer solution on the processed microfiltration basement membranes, placing the microfiltration basement membranes coated with the block copolymer solution in a drying cabinet for vacuum heat treatment (a block copolymer layer solvent is volatilized to form membranes in the process), submerging the microfiltration basement membranes coated with the copolymer thin membranes in a solvent which has a selective swelling effect on one block of the block copolymer to be processed for a while, and taking out the microfiltration basement membranes coated with the copolymer thin membranes from the solvent for drying to obtain the compound porous membranes with block copolymer layers as separation layers and microfiltration basement membranes as supporting layers. The method is simple to operate, convenient and controllable. Chemical reaction is not involved, the prepared compound membranes have high mechanical strength, neat surface structure, and apparent potential of hydrogen (pH)-stimulus sensitivity, show good separation performances and have broad application prospects.

Description

technical field [0001] The invention relates to a composite porous membrane, in particular to a method for preparing a porous membrane using a mesoporous layer based on block copolymer selective swelling as a separation layer and a commonly used microfiltration base membrane as a support layer, that is, based on block copolymerization A method for preparing porous membranes by selective swelling of materials. Background technique [0002] Membrane separation is a new type of high-efficiency and energy-saving separation technology. With its advantages of high-efficiency separation, simple equipment, energy saving, normal temperature operation, and no pollution, it has become an effective means to solve major problems such as energy, resources, and environment faced by contemporary humans. It is of great significance to prepare separation membranes with narrow pore size distribution and high separation precision, and to improve the separation efficiency of separation membranes...

Claims

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Application Information

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IPC IPC(8): B01D71/80B01D69/12B01D69/10B01D67/00
Inventor 汪勇王召根邢卫红范益群汪朝晖
Owner NANJING UNIV OF TECH
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