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Preparation method of amphiphilic triblock polymer blending modified polyvinylidene fluoride ultra-filtration membrane

A polyvinylidene fluoride, blending modification technology, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problems of cumbersome preparation methods of graft copolymers, difficult to control the graft rate, etc., and achieve high protein retention. efficiency and anti-fouling ability, reduce post-processing costs, and optimize the effect of anti-fouling ability

Active Publication Date: 2018-11-30
青岛海若智能技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method of graft copolymer is cumbersome, and the grafting rate is difficult to control, but the direct blending of amphiphilic block copolymer solves this problem

Method used

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  • Preparation method of amphiphilic triblock polymer blending modified polyvinylidene fluoride ultra-filtration membrane
  • Preparation method of amphiphilic triblock polymer blending modified polyvinylidene fluoride ultra-filtration membrane
  • Preparation method of amphiphilic triblock polymer blending modified polyvinylidene fluoride ultra-filtration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] a) Preparation of amphiphilic block copolymer PAMA: 5 g of methyl methacrylate, 0.29 g of RAFT reagent, and 47 mg of azobisisobutyronitrile were dissolved in 60 mL of toluene. Under the protection of argon, the reaction was stirred at 70°C for 24 hours, and the polymer solution after rotary evaporation of part of the solvent was dropped into ice n-hexane to precipitate, and the precipitate was collected by suction filtration, and vacuum-dried to constant weight to obtain PMMA-RAFT. Dissolve 5g of PMMA-RAFT, 10g of acryloylmorpholine, and 47mg of azobisisobutyronitrile prepared above in 60mL of 1,4-dioxane, stir and react at 70°C for 24h under the protection of argon, and remove part of the solvent by rotary evaporation , the polymer solution was added to n-hexane / ethyl acetate mixture to precipitate, and after the precipitate was collected, it was vacuum-dried to obtain light yellow solid PAMA. Wherein, the values ​​of X and Y are controlled according to the change of t...

Embodiment 2

[0027] a) with embodiment 1;

[0028] b) Preparation of PVDF / PAMA modified membrane: Weigh 10g of PVDF powder, 4g lithium chloride, 10% PAMA-70 and N, N-dimethylformamide respectively in a three-necked flask, Stir at 60°C for 12 hours. After it is completely dissolved, prepare a homogeneous film-casting solution with a mass concentration of 21.33%, let it stand at room temperature or vacuum defoam; pour the homogeneous film-casting solution evenly on a dry and clean glass plate 200 μm thick liquid film was scraped out, and after standing in the air for 10 seconds, the flat film was placed in a coagulation bath in parallel at a temperature of 25°C. The prepared flat film was soaked in distilled water for a period of time and then freeze-dried to obtain Amphiphilic block copolymer modified polyvinylidene fluoride ultrafiltration membrane, denoted as M-5k.

Embodiment 3

[0030] a) with embodiment 1;

[0031] b) Preparation of PVDF / PAMA modified membrane: Weigh 9.5g PVDF, 4g lithium chloride, 1.5g PAMA-70 and 63g N,N-dimethylformamide into a three-necked flask, and stir fully at 60°C for 12h , fully dissolved to obtain a homogeneous casting solution, which was left to stand at room temperature or vacuum defoamed; the homogeneous casting solution was poured evenly on a dry and clean glass plate, and a 200 μm thick liquid film was scraped out. After standing in the air for 30s, put the flat film in parallel into the coagulation bath, the coagulation bath is water, the temperature is 25°C, and when the film falls off the glass plate, soak the prepared flat film in distilled water for a period of time, freeze After drying, an amphiphilic block copolymer modified polyvinylidene fluoride ultrafiltration membrane is obtained.

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Abstract

The invention provides a preparation method of an amphiphilic triblock polymer blending modified polyvinylidene fluoride ultra-filtration membrane. According to the present invention, structure-controlled PACMO-b-PMMA-b-PACMO (PAMA) is prepared by using polymethyl methacrylate (PMMA) and polyacryloylmorpholine (PACMO) respectively as the hydrophobic chain segment and the hydrophilic chain segmentof an amphiphilic block polymer through a reversible addition-fragmentation chain transfer polymerization method, and an amphiphilic block copolymer modified ultra-filtration membrane is prepared by using the structure-controlled PACMO-b-PMMA-b-PACMO (PAMA) as a blending modifier through a non-solvent induced phase inversion method, wherein the PMMA chain segment and the PVDF chain segment are entangled in the blending modifier PAMA so as to make the modifier stable in the preparation and use process of the ultra-filtration membrane, and PACMO as the chain segment is enriched on the surface ofthe membrane and the surface of the membrane pore so as to improve the hydrophilicity of the membrane and reduce the deposition adhesion of contaminants on the surface of the membrane; the pore sizeand the porosity are effectively regulated by adjusting the contents of the film forming substance in the film casting liquid and the modifier; and the prepared ultra-filtration membrane has significantly improved permeability, high BSA rejection rate and high stain resistance.

Description

technical field [0001] The invention belongs to the field of polymer material science and relates to an amphiphilic three-block copolymer modified ultrafiltration membrane, in particular to an amphiphilic three-block polymer blend modified polyvinylidene fluoride ultrafiltration membrane Preparation. Background technique [0002] Addressing water pollution and safe water use is one of the most important challenges of our time. Water is the most precious life resource on earth, and the reproduction and growth of all living things are almost inseparable from the nourishment of water resources. Global water scarcity has been exacerbated in recent years as population growth, technological advances in industry and climate change pose an expanding set of threats to water security. To address this challenge, there is an urgent need to develop efficient and sustainable technologies to augment water supply using unconventional water sources (e.g., seawater, brackish water, and wast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/80B01D71/34B01D61/14B01D69/02B01D67/00
CPCB01D61/145B01D67/0002B01D69/02B01D71/34B01D71/80B01D2323/02B01D2323/38B01D2325/36
Inventor 赵军强韩洪蕊王齐齐李冬阳杨景赵义平陈莉
Owner 青岛海若智能技术有限公司
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