formation of poly(vinylidene fluoride) nanofibers part ii: the elaboration of incompatibility in the electrospinning of its solutions

poly(vinylidene fluoride) (pvdf) fibers with two molecular weights were prepared via electrospinning process. in this process, the concentration of spinning depended drastically on the gelation process. also, it was experimentally smaller than obtained concentration in the solution entanglement number approach (sena). proof of this incompatibility was explained by the properties of pvdf and its solutions with dmf (i.e. pvdf crystallization, microgel formation and spinodal decomposition). these factors caused to early stabilize liquid jet. also, early gelation inhibited from the fiber formation by blockage of syringe needle with mw = 180,000 g/mol and early spinodal decomposition helps to fiber formation by isolated droplets of polymer-rich phase with mw=275,000 g/mol. finally, a mechanism was proposed for the electrospinning of these solutions.