Abstract
In this study, an amorphous poly(vinylidene fluoride-hexafluoropropylene) (P(VDF-HFP)) copolymer with a high yield strain (approximately 18 %) is proposed as a cladding material for highly flexible and reliable piezoelectric ribbon fibers. Macro preforms are fabricated for thermal drawing (TD) processes, in which a poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) film is sandwiched between two electrically conductive composite sheets (carbon black (CB)/polypropylene (PP)). The piezoelectric device is cladded with the P(VDF-HFP) copolymer. The preform geometries and TD parameters are optimized to overcome the incompatibility of flow characteristics among P(VDF-HFP), P(VDF-TrFE), and CB/PP composite at the drawing temperature, yielding fibers of length more than 80 m through TD. After annealing and poling, the fiber produces approximately 5 V (peak-to-peak) under 2.5 % tensile strain and 0.5 V (peak-to-peak) under bending deformation, with a 5-mm radius of curvature. Furthermore, the piezoelectric fiber shows no severe degradation in the output voltage after 10000 cycles of bending deformation with 1-mm radius of curvature. The piezoelectric ribbon fiber developed herein has potential as a flexible tensile, pressure, or bending sensor fiber for wearable applications.
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Acknowledgments
This research was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2021R1A2C2094534), Korea Medical Device Development Fund grant funded by the Korea government (the Ministry of Science and ICT, the Ministry of Trade, Industry and Energy, the Ministry of Health & Welfare, the Ministry of Food and Drug Safety) (Project Number: 1711138421, KMDF_PR_20200901_0194) and the Chung-Ang University Graduate Research Scholarship in 2020.
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Seungmin Lee received his B.S. degree in Mechanical Engineering from Chung-Ang University, Seoul, Republic of Korea, in 2020. He is currently a M.S. degree candidate in Chung-Ang University. His current research interests include piezoelectric sensors and actuators, especially in the form of fibers via thermal drawing technique.
Quang Van Duong received his B.E. degree in Materials Engineering, Hanoi University of Science and Technology, Hanoi, Vietnam, in 2014. In 2021, he received his Ph.D. degree in Mechanical Engineering from Chung-Ang University, Seoul, Korea. Since 2021, he has been Postdoctoral Researcher at Department of Mechanical Engineering, CAU. His current research interests are the development of soft sensors and actuators based on ferroelectric polymers.
Namhun Her is an undergraduate student in Mechanical Engineering from Chung-Ang University. His current research interests include piezoelectric fibers and multifunctional fibers via thermal drawing technique.
Anh Tuan Luu received his B.S. degree in material technology from Bach Khoa University, Ho Chi Minh City, Vietnam, in 2017. In 2019, he received his M.S. degree in Mechanical Engineering from Chung-Ang University, Seoul, Republic of Korea. His research interests include electroactive polymer actuators and sensors, piezoelectric nanofibers for self-powered multifunctional fabrics.
Nhi Tuyet Lam received her B.S. in Chemical Engineering from Can Tho University, Can Tho, Vietnam. She received her M.S. in Chemical Materials from Pusan National University, Busan, Republic of Korea. She is currently a Ph.D. candidate in Chung-Ang University, Seoul, Republic of Korea. Her research interests include fiber-based sensors and actuators with electroactive polymers.
Seung Tae Choi received the B.S. degree in mechanical design and precision engineering from Chung-Ang University, Seoul, Republic of Korea, in 1995, and the M.S. and Ph.D. degrees in mechanical engineering from Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea, in 1997 and 2002, respectively. In 2016, he joined Chung-Ang University, Seoul, Republic of Korea, where he is currently a Professor in the School of Mechanical Engineering. His current research interests include development of multifunctional fibers and ferroelectric polymer sensors and actuators.
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Lee, S., Duong, Q.V., Her, N. et al. High-flexibility piezoelectric ribbon fiber fabrication through multi-material thermal drawing. J Mech Sci Technol 36, 3089–3096 (2022). https://doi.org/10.1007/s12206-022-0539-2
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DOI: https://doi.org/10.1007/s12206-022-0539-2