Therefore, we observed the internal structure, surface morphology and diameter changes of nanofibers through TEM and SEM. A small amount of bead-like structure can be observed in the blended nanofiber membrane prepared by the research group earlier, which may be due to the low viscosity of the spinning solution. Therefore, when preparing the coaxial nanofiber membrane, the concentration of PVA in the shell solution was adjusted to 7 %, the degree of molecular chain entanglement increases, the viscosity of the solution increases, and nanofibers with smoother surfaces are obtained.
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