Additive manufacturing of high-β phase poly(vinylidene fluoride) via precipitation printing

Ruowen Tu; Ethan Sprague; Henry Sodano

doi:10.1117/12.2612443

20 April 2022 Additive manufacturing of high-β phase poly(vinylidene fluoride) via precipitation printing

Ruowen Tu, Ethan Sprague, Henry Sodano

Proceedings Volume 12043, Active and Passive Smart Structures and Integrated Systems XVI; 120430D (2022) https://doi.org/10.1117/12.2612443
Event: SPIE Smart Structures + Nondestructive Evaluation, 2022, Long Beach, California, United States

Abstract

Additive manufacturing of poly(vinylidene fluoride) (PVDF) as a piezoelectric material gained wide research interests over the past decade. Promoting the most polar β phase of PVDF during or after the printing process is the key focus to enhance its piezoelectricity. In this paper, a novel additive manufacturing technique termed precipitation printing is developed to produce high-β phase PVDF with the advantages of achieving geometry complexity and fabrication scalability, which is based on the different solubility of PVDF in two mutually miscible solvents. Through dispensing the PVDF/N,N-dimethylformamide (DMF) solution into a water bath, PVDF is continuously precipitated to form a solid structure while DMF diffuses into water. The β phase fraction of printed PVDF is improved to 64.2%. By further hot pressing of precipitation printed PVDF to reduce internal porosity, the piezoelectric d31 and d31 coefficients are measured to be 1.95 pC/N and -6.42 pC/N, respectively. Precipitation printing is also demonstrated to fabricate piezoelectric PVDF energy harvesters, such as a stretching mode strip energy harvester and a heel insole energy harvester. Therefore, precipitation printing provides a new additive manufacturing technique for producing high-β phase PVDF with strong piezoelectric effect, which can be potentially used to produce sensors, energy harvesters and actuators.

Conference Presentation

Citation Download Citation

Ruowen Tu, Ethan Sprague, and Henry Sodano "Additive manufacturing of high-β phase poly(vinylidene fluoride) via precipitation printing", Proc. SPIE 12043, Active and Passive Smart Structures and Integrated Systems XVI, 120430D (20 April 2022); https://doi.org/10.1117/12.2612443

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