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Preparation method of pH response type multi-scale structure polyvinylidene fluoride nanofiber membrane

A technology of polyvinylidene fluoride and nanofiber membranes, which is applied in non-woven fabrics, textiles and papermaking, etc., can solve the problems of polyvinylidene fluoride microfiltration membranes, structural limitations of liquid filtration accuracy and retention rate, etc., and achieve equipment Simple, convenient operation, process controllable effect

Active Publication Date: 2016-07-27
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] PVdF microfiltration membrane is a current research direction of microfiltration membrane. Its pore size is 0.1-1μm, but the accuracy and rejection rate of liquid filtration are limited by its formation structure, making polyvinylidene fluoride microfiltration membrane in some special It is difficult to be applied in fields such as liquid filtration and separation of substances with different molecular weights

Method used

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  • Preparation method of pH response type multi-scale structure polyvinylidene fluoride nanofiber membrane
  • Preparation method of pH response type multi-scale structure polyvinylidene fluoride nanofiber membrane
  • Preparation method of pH response type multi-scale structure polyvinylidene fluoride nanofiber membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Configuration of PVdF solution: Take 1.2096g of PVdF powder, add 9mL of DMF, stir at 35°C to dissolve completely, and prepare a PVDF solution with a mass fraction of 10%;

[0025] (2) Solution aging: after the PVdF powder is completely dissolved, add 0.0968 g of polyethylene polyamine (PVdF powder mass 8%), heat in an oil bath at 40°C and stir for 24 hours;

[0026] (3) Graft copolymerization with acrylic acid: Add 0.2419g acrylic acid (20% of the mass of PVdF powder) and 0.0242g potassium persulfate (2% of the mass of PVdF powder) to the spinning solution in the previous step, heat up to 50°C, dissolve After reaching uniformity, the temperature was raised to 70°C to initiate the reaction for h;

[0027] (4) Electrospinning: after the reaction in the previous step, cool down to 30°C, add 2.25mL of acetone (1 / 4 of the volume of DMF), 0.0605g of tetrabutylammonium bromide (5% of the PVdF powder mass), After being fully dissolved, the electrospinning method was used for...

Embodiment 2

[0029] (1) with embodiment 1;

[0030] (2) Solution maturing: After the PVdF powder is completely dissolved, add 0.1310 g of polyethylene polyamine (PVdF powder mass 10%), heat in an oil bath at 50°C and stir for 24 hours;

[0031] (3) Graft copolymerization with acrylic acid: Add 0.1310g acrylic acid (10% of PVdF powder mass) and 0.036g potassium persulfate (3% of PVdF powder mass) to the spinning solution in the previous step, heat up to 55°C, dissolve After reaching uniformity, the temperature was raised to 75°C to initiate the reaction for 3 hours;

[0032] (4) Electrospinning: After the reaction in the previous step, cool down to 40°C, add 3mL of acetone (1 / 3 of the volume of DMF), and 0.1310g of tetrabutylammonium bromide (10% of the mass of PVdF powder), and wait After fully dissolved, the electrospinning method was used for spinning, the spinning voltage was 35kV, the receiving distance was 20cm, and the liquid supply rate was 0.5ml / h, and the pH-responsive multi-scal...

Embodiment 3

[0034] (1) Configuration of PVdF solution: Take 2.073g of PVdF powder, add 9mL of DMF, stir at 40°C to dissolve completely, and prepare a PVDF solution with a mass fraction of 16%;

[0035] (2) Solution aging: after the PVdF powder is completely dissolved, add 0.2073g polyethylene polyamine (10% of the PVdF powder mass) to the solution, heat in an oil bath at 55°C and stir for 24h;

[0036] (3) Graft copolymerization with acrylic acid: add 0.2073g of acrylic acid (10% of the PVdF powder mass) and 0.0622g of potassium persulfate (3% of the PVdF powder mass) to the spinning solution of the previous step, and heat up to 55°C , dissolve until uniform and then raise the temperature to 75°C to initiate the reaction for 3h;

[0037] (4) Electrospinning: After the reaction in the previous step, cool down to 40°C, add 3mL of acetone (1 / 3 of the volume of DMF), and 0.3110g of tetrabutylammonium bromide (15% of the mass of PVdF powder). After fully dissolved, the electrospinning method ...

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Abstract

The invention relates to a preparation method of a pH response type multi-scale structure polyvinylidene fluoride (PVdF) nanofiber membrane. The nanofiber membrane is obtained by conducting copolymerization on a PVdF spinning solution treated with acrylic acid and polyethylene polyamine and then performing electrostatic spinning. The preparation method is characterized in by comprising the four steps of 1 PVdF solution preparation, 2 solvent curing, 3 graft copolymerization with the acrylic acid and 4 electrostatic spinning. The pH response type multi-scale structure polyvinylidene fluoride (PVdF) nanofiber membrane prepared by means of the preparation method has sensitive pH response characteristics and has a broad application prospect in the fields of chemical or biological separation, substance analysis and detection, separation and purification of precious metals and other fields.

Description

technical field [0001] The invention relates to the technical field of a preparation method of a nanofiber membrane, in particular to a preparation method of a pH-responsive multiscale structure polyvinylidene fluoride (PVdF) nanofiber membrane prepared by electrospinning technology, and belongs to the technical field of intelligent polymer fibers . Background technique [0002] Membrane separation method is a new type of separation technology, which has the advantages of outstanding selective permeation and low energy consumption. Membrane separation technology is also playing an increasingly important role in modern life and production due to its practicality, energy saving, high efficiency, simple process and adjustable advantages. In the past 20 years, the research on membrane materials has become more and more popular, among which smart membranes are particularly prominent. The so-called smart membrane is an environment-responsive membrane material that can respond to...

Claims

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Application Information

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IPC IPC(8): D04H1/728D04H1/4318C08F259/06C08F220/06
CPCC08F259/06D04H1/4318D04H1/728C08F220/06
Inventor 康卫民徐永正程博闻庄旭品厉宗洁赵卉卉史智洁马晓敏邓南平赵义侠李磊
Owner TIANJIN POLYTECHNIC UNIV
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