Surface electrical properties of electrospun PVDF fiber mats

The effects of mass concentration and nature of spinning solution,polarities and ways of applied voltage during electrospinning of polyvinylidene fluoride(PVDF) on the resulting ultrafine fiber morphology,fiber diameter and the surface electrical properties of the fiber mat were investigated,and the feasibility of preparing PVDF electret by electrospinning was also discussed.The results showed that there was certain amount of residual charge stored on the surface of the electrospun fiber mats,and it was positively correlated to the mass concentration of solution.However,the charge dissipated very quickly,which could not be used to prepare electret directly.It was found through comparison that substrates (such as tinfoil,non-woven,plastic film) with different dielectric constants had direct effect on the surface residual potential.