| Ho Chi Minh City Univ. of Tech | Chung-Ang University |
| Faculty of Mechanical Engineering | School of Mechanical Engineering |
Scientific Seminar
Fluorinated Polymer-Based Sensors and Actuators
for Flexible Electronics Applications
Spearker: Prof. Seung Tae CHOI
School of Mechanical Engineering, Chung-Ang University (Email: stchoi@cau.ac.kr)
Date: Oct. 19, 2023
Time: 2:00 PM
Room: B11 Hall
Abstract
PVDF [Poly (vinylidene fluoride)]-based ferroelectric polymers are one of the most promising field-activated electroactive polymers (EAPs) due to their relatively easy processing, large and fast electro-mechanical response, high mechanical and chemical stability, and low acoustic impedance. Among various PVDF-based ferroelectric polymers, P(VDF-TrFE) [poly(vinylidene fluoride-trifluoroethylene)] composed of two monomers, VDF (vinylidene fluoride) and TrFE (trifluoroethylene), is the most widely used due to its high crystallinity and high piezoelectricity. On the other hand, P(VDF-TrFE) based ternary copolymers such as P(VDF-TrFE-CFE) [poly(vinylidene fluoride-trifluoroethylene 1, 1-chlorofluoroethylene)] and P(VDF-TrFE-CTFE) [poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene)] exhibit relaxor ferroelectric characteristics by introducing defects in the ferroelectric P(VDF-TrFE) copolymer with the third monomer CFE or CTFE, which break up the coherent polar regions into nano polar regions. These relaxor ferroelectric polymers can achieve more than 5% of transverse strain under an electric field of 150 V/μm, and are used as various actuator materials. In this lecture, I would like to introduce various sensors and actuators using conventional ferroelectric polymers and relaxor ferroelectric polymers. In particular, I would like to discuss the development and application of flexible haptic actuators using relaxor ferroelectric polymers. In addition, recently, various functional fibers have been developed using thermal drawing process, and I would like to discuss the continuous manufacturing method of various sensors and actuator fibers using fluorine-based polymers.
Profile of Professor Seung Tae CHOI
