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Preparation method for block polymer co-assembled homopore membrane

A technology of block polymer and block copolymer, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. The implementation steps are simple, easy to scale and the effect of industrial production

Active Publication Date: 2015-07-15
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these post-modification ideas for homoporous membranes not only increase the process flow, but also cost time and money, and there is also the risk of changing the homoporous structure.

Method used

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  • Preparation method for block polymer co-assembled homopore membrane
  • Preparation method for block polymer co-assembled homopore membrane
  • Preparation method for block polymer co-assembled homopore membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for preparing a block polymer co-assembled homogeneous membrane, the steps are as follows:

[0033] (1) Polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) and polystyrene-block-poly(N-isopropylacrylamide) (PS-b-PNIPAm ) according to the proportion of 1wt% and 99wt% is dissolved in the middle of the mixed solvent composed of 30wt% 1,4-dioxane and 70wt% tetrahydrofuran to form a casting solution; wherein the total concentration of the polymer in the casting solution is 20wt %, wherein the molecular weight of PS-b-PNIPAm is 100000g / mol, the mass fraction of PNIPAm in PS-b-PNIPAm is 5wt%, wherein the molecular weight of PS-b-P4VP is 100000g / mol, P4VP is in PS-b-P4VP The mass fraction in is 35wt%;

[0034] (2) Standing and aging the above casting solution at room temperature of 25° C. for 6 hours;

[0035] (3) The aged casting solution is salivated into a 200 μm thick film by a scraper;

[0036] (4) above-mentioned film stays 300s in air;

[0037] (5) Immerse t...

Embodiment 2

[0042] A method for preparing a block polymer co-assembled homogeneous membrane, the steps are as follows:

[0043] (1) Polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) and polystyrene-block-poly(acrylic acid) (PS-b-PAA) according to 99wt% and 1wt % ratio is dissolved in the middle of the mixed solvent that is composed of 70wt% tetrahydrofuran and 30wt% dimethylformamide to form casting solution; wherein the total concentration of polymer in the casting solution is 35wt%, wherein PS-b-P4VP The molecular weight is 100000g / mol, the mass fraction of P4VP in PS-b-P4VP is 25wt%; the molecular weight of PS-b-PAA is 600000g / mol, and the massfraction of PAA in PS-b-PAA is 5wt%;

[0044] (2) Standing and aging the above casting solution at room temperature of 25° C. for 48 hours;

[0045] (3) The aged casting solution is salivated into a 200 μm thick film by a scraper;

[0046] (4) above-mentioned film stays 15s in air;

[0047] (5) Immerse the flat membrane in high-purity water ...

Embodiment 3

[0050] A method for preparing a block polymer co-assembled homogeneous membrane, the steps are as follows:

[0051] (1) Polystyrene-block-poly(N,N-ethyl dimethacrylate) (PS-b-PDMAEMA) and polystyrene-block-poly(2-vinylpyridine) (PS- b-P2VP) is dissolved into a mixed solvent composed of 50wt% 1,4-dioxane and 5wt% tetrahydrofuran according to the ratio of 50wt% and 50wt% to form a casting solution; wherein the total amount of the polymer in the casting solution Concentration is 15wt%, wherein the molecular weight of PS-b-PDMAEMA is 100000g / mol, the mass fraction of PDMAEMA in PS-b-PDMAEMA is 10wt%, wherein the molecular weight of PS-b-P4VP is 100000g / mol, P4VP is in PS- The mass fraction in b-P4VP is 35wt%;

[0052] (2) Standing and aging the above casting solution at room temperature of 25° C. for 24 hours;

[0053] (3) Casting the cast solution after aging into a thin film of 200 μm by a scraper;

[0054] (4) above-mentioned film stays 100s in air;

[0055] (5) Immerse the...

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Abstract

The invention relates to a preparation method for a block polymer co-assembled homopore membrane. The preparation method comprises the following steps: dissolving two block polymers with polystyrene serving as hydrophobic blocks in a mixed solvent to form membrane casting liquid, salivating the membrane casting liquid into a thin membrane through a membrane scraping machine after stewing and aging under room temperature, stewing for 15-300s in air, and immersing into a coagulating bath to form the homopore membrane. The block polymer co-assembled homopore membrane prepared by the method disclosed by the invention is characterized by being formed by co-mixing and assembling the two block polymers; compared with the prior art, the preparation method is a novel method for performing in-situ modification and functional design on the homopore membrane.

Description

technical field [0001] The invention relates to a method for preparing a block polymer co-assembled homogeneous membrane. Background technique [0002] Homoporous membrane refers to a high-performance membrane separation material with monodisperse distribution of pore size on the membrane. The outstanding performance of the homoporous membrane lies in its high-resolution screening ability, high water flux and good anti-pollution performance. Among many membrane separation materials, homoporous membrane is not only the first choice to achieve high-precision special separation, but also an ideal model for studying membrane and membrane processes. Among them, the two key technologies to realize the large-scale application of homoporous membranes are the controllable preparation and surface chemical modification of homoporous membranes. [0003] In 2007, Peinemann and Abetz developed a new film-forming method based on the traditional solution phase inversion method: that is, a...

Claims

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Application Information

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IPC IPC(8): B01D71/80B01D67/00
Inventor 易砖周勇高从堦
Owner ZHEJIANG UNIV OF TECH
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