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Microwave-enhanced selective swelling pore-forming method for separation membrane

A selective and membrane-separating technology, applied in chemical instruments and methods, semi-permeable membrane separation, membranes, etc., can solve problems such as high temperature and time-consuming, and achieve the effect of simple preparation method and improved membrane production efficiency

Active Publication Date: 2019-08-16
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the shortcomings of high temperature and long time-consuming for selective swelling at present, and proposes a method of using microwave to strengthen selective swelling to quickly open holes

Method used

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  • Microwave-enhanced selective swelling pore-forming method for separation membrane
  • Microwave-enhanced selective swelling pore-forming method for separation membrane
  • Microwave-enhanced selective swelling pore-forming method for separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] 0.02gPS 55 -P2VP 18.5 The block copolymer was added to 2 g of chloroform solution and fully stirred to dissolve, and the prepared polymer solution was filtered with a filter head with a pore size of 200 μm to remove large particles of impurities; 70 μL of the above solution was spin-coated on the silicon wafer substrate at 2000 rpm for 60 seconds, and then Place it in an oven at 60°C for 3 hours to completely volatilize the solvent to obtain a dense block copolymer film; immerse the film in a container containing ethanol and treat it under 400W microwave conditions for 25s, and take out the film immediately after microwave treatment , placed to dry at room temperature.

[0060] figure 2 It is the SEM image of the surface of the porous block copolymer film prepared in this example. It can be seen from the figure that after 400W microwave treatment for only 25s, the surface of the film presents a low-level double continuous channel structure, and the film opening rate ...

Embodiment 2

[0063] 0.02gPS 55 -P2VP 18.5 The block copolymer was added to 2 g of chloroform solution and fully stirred to dissolve, and the prepared polymer solution was filtered with a filter head with a pore size of 200 μm to remove large particles of impurities; 70 μL of the above solution was spin-coated on the silicon wafer substrate at 2000 rpm for 60 seconds, and then Place it in an oven at 60°C for 3 hours to completely volatilize the solvent to obtain a dense block copolymer film; immerse the film in a container containing ethanol and treat it under 400W microwave conditions for 40s, and take out the film immediately after microwave treatment , placed to dry at room temperature.

[0064] image 3 It is the SEM image of the surface of the porous block copolymer film prepared in this example. It can be seen from the figure that after 400W microwave treatment for only 40s, the film surface presents a high degree of double continuous channel structure, and the film opening rate is ...

Embodiment 3

[0067] 0.02gPS 55 -P2VP 18.5 The block copolymer was added to 2 g of chloroform solution and fully stirred to dissolve, and the prepared polymer solution was filtered with a filter head with a pore size of 200 μm to remove large particles of impurities; 70 μL of the above solution was spin-coated on the silicon wafer substrate at 2000 rpm for 60 seconds, and then Place it in an oven at 60°C for 3 hours to completely volatilize the solvent to obtain a dense block copolymer film; immerse the film in a container containing ethanol and treat it under 800W microwave conditions for 25s, and take out the film immediately after microwave treatment , placed to dry at room temperature.

[0068] Figure 4 It is the SEM image of the surface of the porous block copolymer film prepared in this example. It can be seen from the figure that the surface of the film presents a high degree of double continuous pore structure after 800W microwave treatment for only 25s, and the opening ratio of t...

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Abstract

The invention provides a microwave-enhanced selective swelling pore-forming method for a separation membrane, which comprises the following steps: preparing a compact film by using an amphiphilic block copolymer; immersing the obtained compact film in an alcohol or carboxylic acid solvent, and treating the compact film by using microwaves with the power of 160-800 W for 15-60 s; and immediately taking out and drying the film at room temperature to obtain an amphiphilic block copolymer separation membrane with a bicontinuous porous structure. According to the method, the time required by selective swelling pore-forming of the amphiphilic block copolymer is greatly shortened, and the film preparation efficiency is improved. The method has universality and can be widely applied to the pore-forming process of various amphiphilic block copolymers. And by adjusting the microwave power and time, the pore-forming degree is precisely controlled.

Description

technical field [0001] The invention belongs to the technical field of porous material separation membranes, and in particular relates to a microwave-enhanced selective swelling opening method for separation membranes. Background technique [0002] Block copolymers are composed of two or more thermodynamically incompatible homopolymer segments connected by covalent bonds. It is precisely because of the thermodynamic incompatibility between the segments that block copolymers will Microphase separation occurs. The dispersed phase region formed by microphase separation is generally in the range of ~5-50nm. If the phase region is pore-induced in a certain way, a mesoporous structure with a pore diameter of ~5-50nm can be obtained. This feature endows block copolymers with wide applications in water treatment, especially in the field of ultrafiltration membranes for the separation of substances such as macromolecular proteins and nanoparticles. [0003] To apply the micro-phase...

Claims

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Application Information

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IPC IPC(8): B01D71/80B01D67/00
CPCB01D71/80B01D67/0023B01D2323/16B01D2323/34
Inventor 汪勇史贤松
Owner NANJING UNIV OF TECH
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