writer：Dong Wanga, Kai Wanga and Weilin Xua*
keywords：magnetic composite nanofibers; melt extrusion; immiscible blends; thermoplastics
source：期刊
Issue time：2012年
A novel technique of fabricating magnetic thermoplastic nanofibers by the control of the phase separation of immiscible
polymer blends during melt extrusion was presented. The magnetic poly(vinyl alcohol-co-ethylene) (PVA-co-PE)/Fe3O4
composite nanofibers were prepared via the melt extrusion of cellulose acetate butyratematrix and PVA-co-PE preloaded
with different amounts of Fe3O4 nanoparticles. The morphologies of magnetic composite nanofibers were characterized
by scanning electron microscopy. The uniform dispersion of Fe3O4 nanoparticles in nanofiber matrixes and crystal
structures were confirmed using transmission electron microscopy and wide angle X-ray diffraction. Thermogravimetric
analysis was employed to quantify the exact loading amount of Fe3O4 nanoparticles in the composite nanofibers. The
magnetic measurements showed that composite nanofibers displayed superparamagnetic behavior at room temperature.
With increasing content of Fe3O4 nanoparticles, the saturation magnetization of the magnetic composite
nanofiber significantly improved. The prepared magnetic composite nanofibers might have found potential applications
in the sensors and bio-molecular separation fields