Unlock instant, AI-driven research and patent intelligence for your innovation.

Modified polyvinylidene fluoride nanofiber smart film

A technology of polyvinylidene fluoride and nanofibers, which can be used in non-woven fabrics, textiles, and papermaking. It can solve unreported problems and achieve the effect of sensitive pH response and broad application prospects.

Inactive Publication Date: 2018-01-30
TIANJIN POLYTECHNIC UNIV
View PDF8 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation technology of pH-responsive electrospun nanofiber membranes has not been reported yet.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) The configuration process 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%;

[0026] (2) Solution aging process: After the PVdF powder is completely dissolved, add 0.2073g polyethylene polyamine (10% of the PVdF powder mass), heat in an oil bath at 55°C and stir for 24h;

[0027] (3) Graft copolymerization process with acrylic acid: add the acrylic acid (5% of PVdF powder quality) of 0.1037g and the potassium persulfate (2% of PVdF powder quality) of 0.0415g in the spinning solution of last step, be warming up to 55 ℃, dissolve until uniform, then raise the temperature to 75℃ to initiate the reaction for 3 hours, and graft PAAc on the PVdF macromolecular chain;

[0028] (4) Electrospinning process: after the reaction in the previous step, cool down to 35°C, add 3mL of acetone (1 / 3 of the volume of DMF), 0.3110g of tetrabutylammonium chloride (15% of the mass of ...

Embodiment 2

[0032](1) with embodiment 1;

[0033] (2) with embodiment 1;

[0034] (3) Graft copolymerization process with acrylic acid: add the acrylic acid (10% of PVdF powder quality) of 0.2073g and the potassium persulfate (2.5% of PVdF powder quality) of 0.0518g in the spinning solution of previous step, be warming up to 55 ℃, dissolve until uniform and then raise the temperature to 75℃ to initiate the reaction for 3h;

[0035] (4) Electrospinning process: after the reaction in the previous step, cool down to 35°C, add 3mL of acetone (1 / 3 of the volume of DMF), 0.3110g of tetrabutylammonium chloride (15% of the mass of PVdF powder), After being 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. Permanent PVdF nanofiber smart membrane.

Embodiment 3

[0037] (1) with embodiment 1;

[0038] (2) with embodiment 1;

[0039] (3) Graft copolymerization process with acrylic acid: add the acrylic acid (15% of PVdF powder quality) of 0.3110g and the potassium persulfate (3% of PVdF powder quality) of 0.0622g in the spinning solution of previous step, be warming up to 55 ℃, dissolve until uniform and then raise the temperature to 75℃ to initiate the reaction for 3h;

[0040] (4) Electrospinning process: after the reaction in the previous step, cool down to 35°C, add 3mL of acetone (1 / 3 of the volume of DMF), 0.3110g of tetrabutylammonium chloride (15% of the mass of PVdF powder), After being 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. Permanent PVdF nanofiber smart membrane.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a modified polyvinylidene fluoride nanofiber smart film. The film is characterized in that modified polyvinylidene fluoride forms a macromolecular substance, wherein the mainchain is polyvinylidene fluoride and the side chain is polyacrylic acid, and the range of the molecular weight ratio of the main chain to the side chain is 100:0.5 to 100:2; the modified polyvinylidene fluoride nanofiber smart film is composed of electrospinning branch-shaped polyvinylidene-fluoride-grafted polyacrylic acid nanofibers; when the pH value of the modified PVdF nanofiber smart film ischanged from 1 to 7, the swelling rate of the fiber film is increased from 100% to 800%. The prepared modified PVdF nanofiber smart film has broad application prospects in chemical or biological separation, analysis, detection, separation and purification of materials, controlled release of drugs, chemical sensors and other fields.

Description

technical field [0001] The invention relates to a modified polyvinylidene fluoride (PVdF) nanofiber smart membrane, which belongs to the technical field of polymer smart membranes. 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 playing an increasingly important role in modern life and production due to its advantages of practicality, energy saving, high efficiency, simple process and adjustability. Therefore, the research on membrane materials has become more and more popular in the past 20 years, among which Smart films are particularly prominent. The so-called smart membrane is an environmentally responsive membrane material that can respond to external environmental stimuli obtained by functionalizing and intelligentizing the membrane material. It is mainly reflected in the fact that the structure, p...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): D04H1/728D04H1/4318C08F8/26C08F114/22C08F259/08C08F220/06
Inventor 康卫民闫子硕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