Polymer, 2014, 55 2188-2196
Meice Wang, Dawei Fang, Nannan Wang, Shan Jiang, Jun Nie, Qiang Yu, Guiping Ma*
The polyvinylpyrrolidone (PVP)/poly(vinylidene fluoride) (PVDF) core-shell nanofiber mats with superhydrophobic surface have been prepared via electrospinning its homogeneous blending solutions, and the formation of the coreeshell structure was achieved by the thermal induced phase separation assisted with the low surface tension of PVDF. The electrospinnability of the blending solutions was also investigated by varying the blending ratio of the PVP and PVDF, and it enhanced with the increase of PVP content. SEM and TEM results showed that the fibers size was varied in the range of 100 nm-600 nm with **ooth surface and coreeshell structure. The composition of the shell layer was determined by the XPS ****ysis, and further confirmed by water contact angle (WCA) testing. As the fraction of PVDF exceeding PVP in the electrospinning solutions, the nanofiber mats showed superhydrophobic property with the WCA above 120o. It indicated that the PVDF was concentrated in the shell layer of the fibers. X Ray diffraction (XRD) and attenuated total reflection infrared spectroscopy (ATR-IR) ****ysis indicated that the PVDF was aggregated with the b-phase crystallite as dominant crystallite. The nanofiber mats with the gas breathability and watertightness ability due to the porous structure and superhydrophobic would be potential applied in wound healing.
