“…Coaxial electrospinning involves the use of multiple polymer solutions to form fibers with core-sheath composite structures. Electrospinnable polymers include polystyrene (PS) [33], poly(methyl methacrylate) (PMMA) [34], poly(vinyl alcohol) (PVA) [2], polylactic acid (PLA) [35], polyvinylpyrrolidone (PVP) [25], polycaprolactone (PCL) [36], among others. Environmental and processing factors, such as relative humidity, temperature, polymer concentration, solvent, solution feed rate, applied voltage, needle tip diameter, tip-collector distance, etc., can influence the properties of electrospun nanofibers [32].…”