High-Aligned PVDF Nanofibers with a High Electroactive Phase Prepared by Systematically Optimizing the Solution Property and Process Parameters of Electrospinning

Poly(vinylidene fluoride) (PVDF)-electrosprayed nanofibers have been the subject of much research due to their flexibility and piezoelectric properties compared other piezoelectrics, for example, ceramics or polymeric materials. The performance PVDF is mainly related presence ?-phase. This study aims determine influence working formulation parameters on generation ?-phase, morphology, crystal structure nanofibers. In addition, this innovatively analyzes effect dispersion state molecular chains in solvent electrospinning results. morphology were determined using scanning electron microscopy (SEM), differential calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR). Beadless are obtained when concentration reaches semi-diluted regime entangled dimethylformamide (DMF) DMF/acetone solution. optimization process (static collector, tip collector distance—25 cm, flow rate—1 mL/h, applied voltage—20 kV) allows increase ?-phase fraction from 68.3% ± 1.2% 94.5% 0.6% a 25 w/v% mixture (2/3 v/v). With these same rotating it was observed that at maximum 90.6% 1.1%, rotational speed 200 rpm. orientation quantitatively discussed first time; independent alignment