Preparation and properties of PVA nanofibers with spiral ordered internal structure

The spinning solution of PVA(polyvinyl alcohol) was chosen as the spiral spinning research object. With enough needle length, the macromolecules were straightened and aligned under laminar flow theory. The spiral spinning needle controlled the spiral twisting of the straightened macromolecules. The motion trajectory of titanium dioxide(nanoparticles) in nanofibers was photographed by TEM(transmission electron microscope) under the action of spiral centripetal force, which directly verified the feasibility of the spiral spinning principle. The greater the number of spiral spinning needles, the tighter the spiral arrangement inside the nanofibers and the greater the crystallinity of the nanofibers. The SEM(scanning electron microscope) observation revealed that the diameter of nanofibers had a relationship with the number of spiral spinning needles. When the spiral number of spinning needle was 13, the tensile and bursting properties of the nanofiber membrane were optimal, but when the spiral number of spinning needle was 19, the pore structure, electrical resistance, and antibacterial properties of the nanofiber membrane were optimal.

Automated summary

The spinning solution of PVA(polyvinyl alcohol) was used as the research object for spiral spinning. Under laminar flow theory, the macromolecules were straightened and aligned by a spiral spinning needle, which controlled their twisting. TEM was used to photograph the motion trajectory of titanium dioxide nanoparticles in nanofibers, confirming the feasibility of the spiral spinning principle. The number of spiral spinning needles influenced the tightness of spiral arrangement and crystallinity of the nanofibers, while the diameter of the nanofibers had a relationship with the number of spinning needles. Optimal tensile and bursting properties were observed with 13 spinning needles, while optimal pore structure, electrical resistance, and antibacterial properties were observed with 19 spinning needles.