| 초록 |
Cellulose, an environmentally friendly material, is the richest and the oldest natural polymer. Cellulose can be regenerated or derivatized to yield various useful products due to its renewability, biodegradability, biocompatibility and derivatizability. Recently, more focus has been concentrated a new solvent system of cellulose. Moreover, to improve solubility of cellulose, methods of chemical modification have been studied. cellulose acetate (CA) is one of the most utilized derivatives. If cellulose can be prepared into nanofiber form, it can be applied to various advanced material fields because of its several useful properties. The nanofiber of polymer is easily prepared by electrospinning. Electrospun fibers may have an unusually small diameter, ranging downward from 5 microns to 0.05 microns. The small diameter provides a high surface area to volume ratio, and a high length to diameter ratio. These characteristics are useful in variety of applications, such as separation membrane, wound dressing materials, artificial blood vessels, in nanocomposites, as a non-woven fabric, and many other applications. In this work, the cellulose nanofibers were prepared by deacetylation after electrospinning of cellulose acetate(CA)/acetone solution. The deacetylation of CA nanofibers was achieved by alkali solution at constant temperature. The morphology of CA nanofibers was observed with a scanning electron microscope (SEM). The structures of CA deacetylated with alkali solution were confirmed with a Fourier transform infrared spectroscopy (FT-IR) and a wide angle X-ray diffractormeter (WAXD).
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