Journal of Textile Research PVDF PVDF. Surface electrical properties of electrospun PVDF fiber mats. ZHANG Chuanwen YAN Yurong

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1 Journal of Textile Research Vol. 31 No. 5 May PVDF PVDF PVDF PVDF TQ A Surface electrical properties of electrospun PVDF fiber mats ZHANG Chuanwen YAN Yurong Materials Science and Engineering Institute South China University of Technology Guangzhou Guangdong China Abstract 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. Key words polyvinylidene fluoride PVDF electrospinning surface electrical property polary of applied voltage residual potential % 99% yryan@ scut. edu. cn

2 5 PVDF 11 9 Baldwin PVDF 2. 1 PVDF PVDF 3F N N- DMF PVDF / DMF 7% 9% 10% 11% 13% 1 Tab. 1 Influence of mass concentration on viscosity 15% of PVDF solutions and mean diameters of NDJ-79 electrospun PVDF fibers / % / mpa s / nm ESF-Y PVDF PVDF Philips XL-30FEG PVDF 100 nm 450 nm Digimizer SIMIC Electrostatic Fieldmeter FXM PVDF 1 PVDF 1 15 kv 15 cm 0. 8 ml / h

3 Fig. 1 PVDF Changes of viscosity and residual potential with mass concentration of PVDF solution 2 SEM Fig. 2 SEM images under different voltage applied ways. a Positive potential applied to needle + 15 kv b Negative potential applied to needle - 15 kv c Positive potential applied to collecting plate + 15 kv PVDF d Negative potential applied to collecting plate - 15 kv Tab. 2 Effects of polarities of voltage and applied positions on electrospun fibers / kv / nm / kv Digimizer 2 2

4 5 PVDF PVDF kv 11% 2 15 kv 9% 3 12 kv 15% 4 12 kv 13% 3 11% 15 kv Fig. 3 Decay curve of residual potential stored in fiber mat PVDF 3 Tab. 3 Effects of substrates on residual potential 5 h PP PVDF 8. 4 Tsai 6 14 PVDF / DMF 4 SEM Fig. 4 Graphs and SEM images of electrospun PVDF fiber mats collected on different substrates. a Photo collected by tinfoil b Photo collected by nonwoven c SEM image collected by tinfoil d SEM image collected by nonwoven / kv PP 2. 4 PVDF PVDF PP 4 3

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