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
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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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