講者：曾怡享教授
演講題目：Moisture-induced Actuation of Polyimide-based Films
演講時間：5/5（五）15:30~17:20
演講地點：博雅館 201
主持人：吳紀聖教授
Bio:
I-Hsiang Tseng received her B.S. from Dept. of ChE at NTU (1997), M.S. at NCKU (1999), and Ph.D. from NTU (2003) with Professor Chi-Sheng Wu for research in the field of photocatalysis. From 2004 to 2009, she worked as a guest researcher in Polymeric Materials Group in Building & Fire Research Lab at National Institute of Standards and Technology (NIST) located in Gaithersburg, MD, USA, with the post-doctoral fellowship from MOE, Taiwan. She started the research in polymeric composites at NIST and focused the research interest in polyimide films at National Chin-Yi University of Technology, where she worked as a post-doctoral researcher and an assistant professor. She is currently serving as assistant professor of Dept. of ChE at Feng Chia University. Her research is focused on the design of micro-nanocomposite materials and their applications in photocatalysis and electronic devices.
Moisture-induced Actuation of Polyimide-based Films
I-Hsiang Tseng (曾怡享)
Department of Chemical Engineering, Feng Chia University, Taichung, Taiwan
Abstract:
A lot of efforts have been focused on the fabrication and modification of polyimide (PI) films to obtain improved mechanical, thermal, optical and barrier properties for advanced applications. On the other hand, the drawbacks of PI can also be engineered for specific applications. Recently, the folding of organo-soluble and free-standing polyimide (PI) films under the stimuli of fingertip-touching or air-blowing, just like the thigmonastic responses of the leaves of Mimosa Pudica, were discovered for the first time in our group. We discovered that the PI films at the dry status could rapidly and reversibly attract and release water molecules at the interface of the thin film in response to the changes of environmental humidity. The moisture-triggered heterogeneous deformation across the film led to self-folding of PI films. With the blending of suitable amounts of sulfonated-polyaniline (PANI-S) to the PI matrix, the resultant PANI-S/PI film could more effectively breath water from the air and simultaneously create more significant deformation and faster recovery. With the suitable designed patterns on the film, it can serve a highly sensitive and reliable actuator to grasp and release subjects as well as to fold into 3D structures, and to roll like a tank tread by providing trace moisture gradients. This robust PANI-S/PI film can be cast into any shape or coated on various substrates and thus is a promising material for smart delivery systems in industrial applications.