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Melt Electrowriting of Electroactive Poly(vinylidene difluoride) Fibers

preprint
submitted on 11.10.2018 and posted on 15.10.2018 by Sammy Florczak, Thomas Lorson, Tian Zheng, Miroslav Mrlik, Dietmar Hutmacher, Michael Higgins, Robert Luxenhofer, Paul Dalton

Poly(vinylidene difluoride) (PVDF) has piezoelectric properties suitable for numerous applications such as flexible electronics, sensing and biomedical materials. In this study, individual fibers with diameters ranging from 17-55 μm were processed using melt electrowriting (MEW). Electroactive PVDF fibers can be fabricated via MEW, while the polymer could remain molten for up to ten hours without noticeable changes in the resulting fiber diameter. MEW processing parameters for PVDF were investigated, including applied voltage, pressure and temperature. A rapid fiber characterization methodology for MEW that automatically determines the fiber diameters from camera images taken of microscope slides was developed and validated. The outputs from this approach followed previous MEW processing trends already identified with different polymers, although overestimation of the < 25 micron fiber diameters was observed. The transformation of the PVDF crystalline phase to the electroactive beta-phase – without poling – was confirmed using piezo-force microscopy and revealed that the PVDF fibers possess piezoelectric responses showing d33~19 pm/V.

Funding

EACEA program BIOFAB (#2013/3137001-001), Volkswagen Stiftung (#93417), Deutsche Forschungsgemeinschaft (INST 105022758-1), Unibund of the Würzburg University (#16-51), ARC Centre for Excellence for Electromaterials Science and Australian National Fabrication Facility-Materials Node, ARC ITCC in Additive Biomanufacturing

History

Email Address of Submitting Author

robert.luxenhofer@uni-wuerzburg.de

Institution

Julius-Maximilians-University Würzburg

Country

Germany

ORCID For Submitting Author

0000-0001-5567-7404

Declaration of Conflict of Interest

no conflict of interest

Version Notes

manuscript submitted for peer review

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