Method for preparing porous nanofibers by electrospinning combined with resolvent technology
An electrospinning and nanofiber technology, applied in fiber processing, fiber chemical characteristics, filament/wire forming, etc., can solve the problems of uncontrollable porous nanofiber hole size, narrow application range, low fiber strength, etc., and achieve fiber The effect of compact interior, high mechanical properties and broad application prospects
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Embodiment 1
[0049] Preparation of porous PVP nanofibers:
[0050] Add 0.61 g of spinnable polymer PVP into 10 ml of ethanol solvent, and mix evenly to obtain a polymer spinning solution;
[0051] Put the polymer spinning liquid into the propulsion pump, adjust the electrospinning voltage to 5kv, the propulsion speed to 0.005ml / min, the receiving distance to 5cm, the spinning temperature at 0°C, and the humidity at 10%, to carry out electrospinning. Obtain polymer PVP nanofiber;
[0052] The obtained PVP nanofibers are subjected to resolvent treatment, and the resolvent used is absolute ethanol; the time of resolvent treatment is 10s, the relative partial pressure of solvent vapor is 5% to 50%, and the temperature is 0°C to 50°C;
[0053] Freeze the PVP nanofibers treated with the reconstituted solvent below the freezing point and dry them under low pressure. The freezing temperature is -50° C., the drying pressure is 20 Pa, and the low pressure drying time is 10 hours to obtain porous PV...
Embodiment 2
[0055] Preparation of porous PVAC nanofibers:
[0056] Add 5.1 g of spinnable polymer PVAC into 10 ml of tert-butanol solvent, and mix well to obtain polymer spinning solution;
[0057] Put the polymer spinning solution into the propulsion pump, adjust the electrospinning voltage to 20kv, the propulsion speed to 0.023ml / min, the receiving distance to 15cm, the spinning temperature at 25°C, and the humidity at 30%, to carry out electrospinning. Obtain polymer PVAC nanofiber;
[0058] The obtained PVAC nanofibers are subjected to resolvent treatment, and the resolvent used is tert-butanol; the time of resolvent treatment is 800s, the relative partial pressure of solvent vapor is 20% to 90%, and the temperature is 25°C to 50°C;
[0059] The PVAC nanofibers treated with the reconstituted solvent were frozen below the freezing point and dried under low pressure. The freezing temperature was -5° C., the drying pressure was 9 Pa, and the low pressure drying time was 5 hours to obtai...
Embodiment 3
[0061] Preparation of porous TiO 2 Nanofibers:
[0062] Add 0.572g of spinnable polymer PVP to 9ml of ethanol solvent, add 0.5ml of ceramic material precursor butyl titanate and buffer agent glacial acetic acid 1ml, stir evenly, and obtain a spinning solution containing ceramic precursor;
[0063] Put the ceramic precursor spinning solution into the propulsion pump, adjust the electrospinning voltage to 30kv, the propulsion speed to 0.037ml / min, the receiving distance to 20cm, the spinning temperature at 45°C, and the humidity at 50%, to carry out electrospinning , to obtain butyl titanate / PVP composite nanofibers;
[0064] The obtained butyl titanate / PVP composite nanofiber is subjected to resolvent treatment, and the resolvent used is water; the time of resolvent treatment is 1000s, the relative partial pressure of solvent vapor is 5% to 90%, and the temperature is 20°C to 50°C;
[0065] The butyl titanate / PVP composite nanofibers treated with resolvent were frozen and dr...
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