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Phase separation membrane based on block copolymer self-assembly and interface induction as well as preparation method and application of phase separation membrane

A block copolymer and self-assembly technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problems of poor mechanical properties of the membrane, large amount of polymer, large pore size, etc., and achieve porosity reduction , simple operation, easy to repeat the effect

Pending Publication Date: 2021-07-09
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pure block copolymers prepared by this method have poor mechanical properties, large pore size, and a large amount of polymer

Method used

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  • Phase separation membrane based on block copolymer self-assembly and interface induction as well as preparation method and application of phase separation membrane
  • Phase separation membrane based on block copolymer self-assembly and interface induction as well as preparation method and application of phase separation membrane
  • Phase separation membrane based on block copolymer self-assembly and interface induction as well as preparation method and application of phase separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042](d) Weigh 20 mg of block copolymer polystyrene-block-poly-4-vinylpyridine (PS-b-P4VP) (molecular weight is 190000-b-64000g / mol) and 2 mg of 3-pentadecyl Phenol (PDP) was added to a mixed solvent of 60ml N,N-dimethylformamide (DMF) and 300ml chloroform, and stirred at room temperature for 12h at a stirring speed of 300r / min.

[0043] (e) Prepare a petri dish filled with deionized water, keep the water temperature at 10°C in an ice water bath, and the humidity is 40% RH, use a plastic dropper to draw the casting solution and drop it on the water surface so that it is on the surface of the deionized water For film formation, place in an open environment for 12 hours to fix the surface structure of the film.

[0044] (f) Then the film was picked up and soaked in methanol for 12 hours, and the obtained film was taken out with tweezers, and dried naturally.

[0045] Depend on figure 1 (a) shows that the surface of the membrane prepared in Example 1 not only has regular cylin...

Embodiment 2

[0047] Weigh block copolymer polystyrene-block-poly 4-vinylpyridine (PS-b-P4VP) (molecular weight is 190000-b-64000g / mol) 10mg adds 300mgN,N-dimethylformamide (DMF ) and 1500mg of chloroform mixed solution, room temperature ultrasonic to make it dissolve completely.

[0048] Depend on figure 2 (a) shows that the form of the block copolymer in the embodiment 2 is a micelle spherical shape under the solvent condition of 1:5 in DMF and chloroform, by figure 2 (b) shows that the size distribution of micellar spheres is centered at 20–25 nm.

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Abstract

The invention discloses a novel preparation method of a phase separation membrane based on block copolymer self-assembly and interface induction, and belongs to the field of porous material separation membranes. The block copolymer film is mainly a polymer surface structure formed by separating a hydrophilic phase and a hydrophobic phase of a block copolymer on an air-water interface. The preparation method of the block copolymer membrane comprises the following steps: selecting a polymer and a small-molecule additive with proper block proportion and molecular weight, dissolving the polymer and the small-molecule additive in a selective solvent, stirring for a certain time to form uniform and transparent viscous liquid; then sucking a proper amount of the viscous liquid by using a plastic dropper, and fixing the surface structure of the polymer membrane through non-solvent and solvent exchange for a period of time, meanwhile, dissolving the small-molecule additive to form pores according to a similar dissolvability principle, so that the selective separation effect is achieved. At present, most methods for preparing polymer membranes are tedious and high in energy consumption, the membrane preparation method is universal, simple and low in cost, and the prepared membrane has high mechanical performance.

Description

technical field [0001] The invention belongs to the field of porous material separation membranes, in particular to a novel preparation method based on block copolymer self-assembly and interface-induced phase separation membranes. Background technique [0002] With the increasingly serious problems of energy, water resources and environmental protection, membrane science and technology have gained more and more attention. Membrane science and technology is a multidisciplinary emerging technology. In recent years, on the basis of the development and interpenetration of various disciplines, membrane science has developed rapidly, and has become a new growth point for the development of chemistry and chemical engineering disciplines, and is also the focus of contemporary high-tech development. Membrane separation technology refers to the method of separating, grading, purifying and enriching two-component or multi-component solutes or solvents with artificially synthesized or...

Claims

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Application Information

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IPC IPC(8): B01D71/80B01D69/02B01D67/00B01D61/00C02F1/44C02F103/08
CPCB01D71/80B01D69/02B01D67/0006B01D61/00C02F1/44C02F2103/08Y02A20/131
Inventor 于海洲闫丽娟
Owner NANJING UNIV OF TECH