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Influence of additive on structure of PVDF nanofibers electrospun via new spinneret design

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Correspondence to: M. Kotaki (E-mail: m-kotaki@kit.ac.jp)

ABSTRACT

Surface morphology and internal structure of polyvinylidene fluoride (PVDF) nanofibers were investigated in this study. PVDF nanofibers were electrospun by two types of spinnerets, nozzle and channel spinneret, with different contents of tetrabutylammonium chloride (TBAC) and at various take-up velocities. The new spinneret design, channel spinneret, resulted in thicker fibers while high β-phase content and small d-spacing were obtained, especially in the case of low TBAC content. And high TBAC content led to finer PVDF nanofibers with high β-phase content and small d-spacing compared to low TBAC content regardless of spinneret types, while an increase in take-up velocity did not have significant effect on both morphology and internal structure of PVDF nanofibers regardless of TBAC content. It suggests that electrostatic drawing acted dominantly rather than mechanically drawing in the system cooperating TBAC. However, the decreasing difference between two types of spinnerets was observed in terms of β-phase content with an increase in TBAC content. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1752–1758, 2013

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