Cross-linked modified PVOF-HFP superfine fiber film and preparing method

A technology of superfine fiber and cross-linking modification, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of difficult peeling of metal aluminum foil, sticky hand feeling, etc. The effect of high liquid rate and high porosity

Inactive Publication Date: 2007-11-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The glass transition temperature of PVDF-HFP is about -40°C, which makes the electrospun PVDF-HFP ultrafine fiber membrane feel stickier than the electrospun PVDF membrane, and is not easy to peel off from the receiving metal aluminum foil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Dissolve 1.6g of PVDF-HFP with a relative molecular mass of 480,000 in a mixed solvent of 6mL DMF and 4mL acetone, stir at 45°C at a speed of 100rpm for 2h to completely dissolve to obtain a clear solution, and then add 0.36mL of a relative molecular mass To 330 PEGDMA, continue to stir for 1.5h. Electrospinning was carried out under the conditions of receiving distance 15cm, working voltage 15kV and flow rate 0.47mL / h. After 3h, the PVDF-HFP electrospun fiber membrane containing PEGDMA can be obtained. The PVDF-HFP / PEGDMA microfiber membrane was placed in a vacuum oven and dried at 25° C. and a vacuum of 200 Pa for 24 h. After there is no residual solvent in the ultrafine fiber membrane, put it into an electric blast drying oven and heat it at 125°C for crosslinking, and take it out after 2 hours of reaction to obtain a PVDF-HFP ultrafine fiber membrane modified by PEGDMA crosslinking.

Embodiment 2

[0012] Dissolve 2.0g of PVDF-HFP with a relative molecular mass of 480,000 in a mixed solvent of 7mL DMF and 3mL of acetone, stir at 50°C at a speed of 120rpm for 1.8h to completely dissolve to obtain a clear solution, and then add 0.50mL of a relative molecular mass 550 PEGDMA, continue to stir for 1.3h. It was electrospun under the conditions of receiving distance 20cm, working voltage 18kV, and flow rate 0.2mL / h. After 3h, the PVDF-HFP electrospun fiber membrane containing PEGDMA can be obtained. The PVDF-HFP / PEGDMA electrospun fiber membrane was placed in a vacuum oven and dried at 28° C. and a vacuum of 200 Pa for 20 h. After there is no residual solvent in the film, put it into an electric blast drying oven and heat it at 135°C for crosslinking, and take it out after 0.5h of reaction to obtain a PVDF-HFP ultrafine fiber membrane modified by PEGDMA crosslinking.

Embodiment 3

[0014] Dissolve 1.2 g of PVDF-HFP with a relative molecular mass of 480,000 in a mixed solvent of 8 mL of DMF and 2 mL of acetone. Stir at 50°C at 150 rpm for 1.5 h to completely dissolve to obtain a clear solution, then add 0.25 mL of PEGDMA with a relative molecular mass of 875 and 5.5 mg of AIBN, and continue stirring for 1.2 h. It was electrospun under the conditions of receiving distance 12cm, working voltage 12kV, and flow rate 0.4mL / h. After 3h, the PVDF-HFP electrospun fiber membrane containing PEGDMA can be obtained. The PVDF-HFP / PEGDMA electrospun fiber membrane was placed in a vacuum oven and dried at 25° C. and a vacuum degree of 200 Pa for 24 h. After there is no residual solvent in the film, put it into an electric blast drying oven and heat at 80°C for cross-linking, and take it out after 15 hours of reaction to obtain a PVDF-HFP ultrafine fiber film modified by PEGDMA cross-linking.

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Abstract

The present invention relates to a crosslinking modified PVDF-HFP superfine fibre membrane and its preparation method. The described crosslinking modified PVDF-HFP superfine fibre membrane is a superfine fibre membrane whose thickness is 10 micrometers-60 micrometers which is made up by using superfine fibres of PEGDMA whose mass content is 10-35% and PVDF-HFP whose mass content is 90-65% and whose diameter is 50nm-500nm. Its preparation method includes the following steps: in the DMF and acetone mixed solvent adding PVDF-HFP, PEGDMA and AIBN initiating agent to prepare electric spinning solution, utilizing said electric spinning solution to make electrostatic spinning so as to obtain the membrane formed from superfine fibre whose diameter is 50nm-500nm, then making the formed superfine fibre membrane undergo the processes of vacuum-drying, removing residual solvent and crosslinking reaction for 0.5-15h at 80-135deg.C so as to 8obtain the invented crosslinking modified PVDF-HFP superfine fibre membrane.

Description

technical field [0001] The invention relates to a cross-linked modified PVDF-HFP superfine fiber membrane and a preparation method thereof, belonging to the functional filtration membrane technology of vinylidene fluoride-hexafluoropropylene copolymer. Background technique [0002] Nanoscale polymer ultrafine fiber membranes can be prepared by electrospinning. Due to the characteristics of high porosity and small pore size, electrospun fiber membranes have broad application prospects in the fields of biomedicine, optoelectronics, and textile engineering. However, since the diameter of electrospun fibers is usually hundreds of nanometers, the mechanical properties of electrospun fiber membranes are generally poor, making it difficult to make them suitable for occasions with high mechanical properties requirements. [0003] The mechanical properties of the electrospun membrane can be slightly improved by chemical crosslinking. For example, cross-linking polyvinyl alcohol ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/32B01D69/08
Inventor 袁晓燕赵亮李晓然赵瑾
Owner TIANJIN UNIV
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