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Preparation method of hydroxyl-containing block copolymer and anti-pollution, acid-alkali and swelling-resistant porous membrane

A technology of block copolymers and hydroxyl blocks, which is applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve problems such as inability to adapt to various pH environments, difficulty in assembling porous membranes, and intolerance to pollution. Achieve stable retention rate, high water flux recovery rate, and prolong service life

Active Publication Date: 2022-04-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the difficulty in assembling the original porous membrane, which cannot adapt to various pH environments and is not resistant to pollution.

Method used

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  • Preparation method of hydroxyl-containing block copolymer and anti-pollution, acid-alkali and swelling-resistant porous membrane
  • Preparation method of hydroxyl-containing block copolymer and anti-pollution, acid-alkali and swelling-resistant porous membrane
  • Preparation method of hydroxyl-containing block copolymer and anti-pollution, acid-alkali and swelling-resistant porous membrane

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preparation example Construction

[0034] In the preparation method of the present invention, the chemical equation of the block polymer reduction reaction is as follows:

[0035]

[0036] This equation explains the transformation of functional groups upon addition of reducing agents, and the disappearance of responsiveness and chargeability.

Embodiment 1

[0038] A kind of preparation method of hydroxyl-containing block copolymer and anti-pollution, acid-alkali and swelling-resistant porous membrane

[0039]1) Polymer reduction modification: reduction modification of copolymers containing ester groups: polymethyl methacrylate block accounts for 20%, polystyrene-block-polymethyl methacrylate with a molecular weight of 72600kg / mol Dissolve 1 g of the ester copolymer in 30 ml of anhydrous tetrahydrofuran at a concentration of 3%, and pass nitrogen for 30 minutes. Put 0.02 mol of lithium aluminum hydride in an equivalent amount of anhydrous tetrahydrofuran. Lithium aluminum hydride: ester group is equal to 10:1, and pass nitrogen 30 minutes. After 30 minutes, under a nitrogen atmosphere, slowly add the anhydrous tetrahydrofuran solution of polystyrene-block-polymethyl methacrylate copolymer dropwise to the anhydrous tetrahydrofuran solution system of lithium aluminum hydride, and the concentration is 1.5 %. The reaction system was...

Embodiment 2

[0044] A kind of preparation method of hydroxyl-containing block copolymer and anti-pollution, acid-alkali and swelling-resistant porous membrane

[0045] 1) Polymer reduction modification: Reduction modification of block copolymers containing ester groups: polyethyl methacrylate accounts for 10%, polystyrene-block-polymethacrylic acid with a molecular weight of 85000kg / mol Dissolve 1 g of ethyl ester copolymer in 10 ml of anhydrous nitrogen, nitrogen-dimethylformamide at a concentration of 3%, pass nitrogen gas for 30 minutes, place 0.02 mol of lithium aluminum hydride in an equivalent amount of anhydrous nitrogen, nitrogen-dimethylformamide In the amide, lithium aluminum hydride: ester group is equal to 20:1, and nitrogen gas is passed for 3 minutes. After 30 minutes, under a nitrogen atmosphere, the anhydrous nitrogen, nitrogen-dimethylformamide solution of polystyrene-block-polyethylmethacrylate copolymer was slowly added dropwise to anhydrous anhydrous lithium aluminum hy...

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PUM

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Abstract

The invention discloses a method for preparing a hydroxyl-containing block copolymer and a pollution-resistant, acid-alkali-resistant, swelling porous membrane. In the method, a block copolymer containing carbonyl or epoxy functional group repeating units in a certain block is reduced and modified, The χ value between the two blocks increases, and the chargeability and pH responsiveness of the polymer chain disappear. The method does not need to use a higher molecular weight block copolymer, and can form a stable porous membrane with a pollution-resistant pore size through the reduction modification of the original polymer.

Description

technical field [0001] The invention belongs to the field of high-performance separation membranes, and in particular relates to a preparation method of a hydroxyl-containing block copolymer and a pollution-resistant, acid-base and swelling-resistant porous membrane. Background technique [0002] Porous membrane is a kind of separation membrane with narrow pore size distribution and high porosity. Its unique characteristics of uniform pore size distribution and high porosity enable it to achieve simultaneous increase in selectivity and permeability. Among them, block copolymer self-assembly endows the film with excellent performance because it can make full use of the characteristics of the material itself. The self-assembly of block copolymers is divided into three methods: selective removal, selective swelling, and non-solvent phase inversion. The non-solvent phase inversion is simple to operate and easy to control. Therefore, large-scale preparation of porous membranes ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/80C08J5/18C08L53/00
CPCB01D71/80B01D67/00B01D67/0009B01D67/0016B01D69/02C08J5/18C08J2353/00
Inventor 易砖左圆圆吴涛
Owner ZHEJIANG UNIV OF TECH