2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 7: Yang Intl. Symp. / Multiscale Material Mechanics
| Editors: | Kongoli F, Aifantis E, Wang H, Zhu T |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 190 pages |
| ISBN: | 978-1-987820-48-5 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Enhanced Polarization and Fracture Strength in P(VDF-TrFE) Copolymer Films by Tailored Electric Cyclings
Fei Fang1; Wenqi Jing2; Wei Yang2;1, Beijing, China; 2TSINGHUA UNIVERSITY, Beijing, China;
Type of Paper: Regular
Id Paper: 447
Topic: 1
Abstract:
Ferroelectric polymers are flexible and easy to compliant with different forms of surfaces. Their low mechanical and acoustic impedance make them good candidates as sensors and transducers in the ultrasonic medical image, blood pressure, and pulse measurements, touch sensors in robotics, etc. [1-3]. For applications involving the external alternating electric field, ferroelectrics usually encounter the issue of electric fatigue after repetitive polarization switching. In this talk, we present a tailored electric cyclic process to enhance both the remnant polarization and fracture strength in Poly(vinylidene fluoride-trifluoroethylene) 65/35 mol % (P((VDF-TrFE 65/35)) copolymer films. The films suffer lower and higher field magnitude electric cycling successively.SEM and XRD results disclose the change of rod-like textures and crystallinity after electric cycling for the films. A microstructure evolution model, which addresses the effects of electric cycling on the ordering of the molecular chain structure, as well as on the fracture behavior, is proposed. The results indicate that electric cycling causes the molecular chains to be packed in a more ordered and closely packed structure. Consequently, the tensile strength is increased while the fracture strain is reduced for the copolymer films after electric cycling.