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, whic

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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Example Embodiment

[0028] Example 1

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

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

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

[0032] d) Put the glass sheet loaded with PVDF film (which has been coated with the block copolymer solution) in a vacuum drying oven at 130 °C, vacuumize for 20 minutes, then release the air, open the oven door and turn off the power supply of the drying oven , let the box cool down naturally for 3 hours. After this step, the b...

Example Embodiment

[0039] Example 2

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

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

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

[0043] d) Place the glass sheet loaded with the PES film (which has been coated with the block copolymer solution) in a vacuum drying oven at 100 °C, vacuumize for 30 minutes, then release the air, open the oven door and turn off the power supply of the drying oven , let the box cool ...

Example Embodiment

[0047] Example 3

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

[0049] b) Take a piece of nylon membrane (the area of ​​the membrane is about 6.25 square centimeters), soak it in silicone oil for 5 minutes, take it out, and then lay it flat 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 spread it evenly on the entire surface of the nylon membrane;

[0051] d) Place the glass sheet loaded with the nylon membrane (which has been coated with the block copolymer solution) in a vacuum drying oven at 160 °C, vacuumize for 20 minutes, then release the air, open the oven door and turn off the power supply of the oven , let the box cool down naturally ...

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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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