Preparation method for controllable patterned electrospinning fiber aggregate
A technique for electrospinning, agglomeration, used in fiber processing, bundling of freshly blown filaments, textiles, and papermaking
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Embodiment 1
[0039] Weave the wires in a single braided manner to form a grid receiving template. The diameter of the wires is 0.1mm and the spacing between the wires is 0.14mm. Select this grid template as the collecting substrate ( figure 2 ). Dissolve 0.275g of polylactic acid (PDLLA, Mw=45kDa) in 8ml of N,N-dimethylformamide (DMF) and 2ml of tetrahydrofuran (THF), and stir at room temperature to form a uniform and stable solution. Put the polymer solution into the syringe, and connect the needle of the syringe to a high-voltage power supply. The solution supply flow is controlled at 0.2ml / h by the flow pump, the applied voltage is 5kv, and the distance between the high voltage end and the ground end is 10cm. Through this process, electrospun fiber aggregates with regular morphology similar to the substrate structure were collected ( Figure 7 , 8 ).
Embodiment 2
[0041]Fix a straight thin wire with a diameter of 0.15 mm on an insulating board as a template for wire bump collection. Dissolve 0.275g of polylactic acid (PDLLA, Mw=45kDa) in 8ml of N,N-dimethylformamide (DMF) and 2ml of tetrahydrofuran (THF), and stir at room temperature to form a uniform and stable solution. Put the polymer solution into the syringe, and connect the needle of the syringe to a high-voltage power supply. The solution supply flow is controlled at 0.2ml / h by the flow pump, the applied voltage is 5kv, and the distance between the high voltage end and the ground end is 10cm. Through this process, the fibers are only deposited on the thread protrusions and the collected fibers are oriented ( Figure 9 ).
Embodiment 3
[0043] Manufacture a series of square protrusions on the iron plate by wire cutting technology. The side length of the protrusions is 0.1mm, the height is 0.35mm, and the distance between the protrusions is 0.2mm. The conductive substrate with protrusions is used as a collection template ( Figure 4 ). Dissolve 0.275g of polylactic acid (PDLLA, Mw=45kDa) in 8ml of N,N-dimethylformamide (DMF) and 2ml of tetrahydrofuran (THF), and stir at room temperature to form a uniform and stable solution. Put the polymer solution into the syringe, and connect the needle of the syringe to a high-voltage power supply. The solution supply flow is controlled at 0.2ml / h by the flow pump, the applied voltage is 5kv, and the distance between the high voltage end and the ground end is 10cm. Through this process, electrospun fiber aggregates with regular morphology similar to the substrate structure were collected ( Figure 10 , 11 ).
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