| 초록 |
Poly(vinylidene fluoride) (PVDF) materials have distinct pyro-, ferro- and piezoelectric characteristics which can expand their usages to piezoelectric fibers, films, sensors, etc. We studied the electrospinnability of PVDF nanofibers via rheological analysis. The electrospinnability of PVDF is affected by various parameters such as the concentration of solutions, solvent types, and electrospinning voltages. The electrospinnability of the PVDF solutions was analyzed by plotting the the Cole-Cole plots. Besides, PVDF exists in several crystal phases depending on the spatial arrangement of -CF2- groups. Especially, a β crystal phase has all trans structure of the -CF2- groups in the same direction. To investigate the correlation between the β phase content and electrospinning voltage, the β phase fraction was calculated by XRD and FTIR spectra. We imagine that the β crystal phase would affect the electro-rheological properties as well as the piezoelectricity of the PVDF nanofibers. |
