Method for preparing polymer porous nanofiber through mixed phase separation
A nanofiber, polymer technology, applied in the direction of single-component synthetic polymer rayon, chemical post-treatment of synthetic polymer rayon, rayon made of cellulose derivatives, etc. High requirements, limited range of polymer selection, etc., to achieve the effect of wide application range and simple preparation method
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[0023] Example 1
[0024] Select ethylene glycol as the additive, N,N-dimethylacetamide as the solvent, the mass ratio of additive to solvent is 1:4, and the mass ratio of polyvinylidene fluoride to solvent is 1:5, and mix in a round bottom flask. Evenly, heat to 90°C, fully stir until the mixed system becomes a homogeneous solution, and then stand to defoam. Then the solution was electrospinned under the conditions of spinning voltage of 20kV, micro-syringe pump flow rate of 0.5mL / h, and spinning distance of 11cm, and the obtained fibers were received in an ice water bath. The obtained nanofibers were soaked in ethanol at 0°C for 60 minutes, ethylene glycol and N,N-dimethylacetamide were extracted, and then soaked in n-hexane for 30 minutes to replace the ethanol, and then the nanofibers were vacuum dried at 30°C. 6 After hours, porous polyvinylidene fluoride nanofibers are obtained. The average diameter of the fiber is about 450 nm, and the pore diameter ranges from 30 to 70 ...
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[0029] Example 2
[0030] Choose dimethyl sulfoxide as the additive, N,N-dimethylformamide as the solvent, the mass ratio of additive to solvent is 1:1, and the mass ratio of polyacrylonitrile to solvent is 1:3, in a round bottom flask Mix uniformly, heat to 90°C, stir well until the mixed system becomes a homogeneous solution, and then stand to defoam. Then the solution was electrospinned under the conditions of a spinning voltage of 16kV, a flow rate of a micro-syringe pump of 0.7mL / h, and a spinning distance of 5cm, and the resulting fibers were received in an ice water bath. The obtained fiber was immersed in ethanol at 0°C for 30 minutes, dimethyl sulfoxide and N,N-dimethylformamide were extracted, and then soaked in n-hexane for 20 minutes to replace the ethanol, and then the nanofibers were vacuumed at 40°C Drying for 8 hours to remove n-hexane to obtain polyacrylonitrile porous nanofibers. The average diameter of nanofibers is about 450nm, and the pore size ranges from ...
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[0032] Example 3
[0033] Choose dimethyl sulfone as the additive, N,N-dimethylformamide as the solvent, the mass ratio of additive to solvent is 1:1, and the mass ratio of polyacrylonitrile to solvent is 1:4, and mix in a round bottom flask Evenly, heat to 90°C, fully stir until the mixed system becomes a homogeneous solution, and then stand to defoam. Then the solution was electrospinned under the conditions of a spinning voltage of 10kV, a microsyringe pump flow rate of 0.5mL / h, and a spinning distance of 7cm, and the resulting fibers were received in a water bath at 10°C. The obtained fiber was soaked in ethanol at 10°C for 30 minutes, dimethyl sulfone and N,N-dimethylformamide were extracted, and then soaked in n-hexane for 15 minutes to replace the ethanol, and then the nanofibers were vacuum dried at 30°C The n-hexane was removed for 8 hours to obtain polyacrylonitrile porous nanofibers. The average diameter of nanofibers is about 700 nm, and the pore diameter ranges fro...
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