Speaker：Prof. Qibing Pei, University of California, Los Angeles

Panelist: Yuqing Zheng, Peking University

Time: 20:00 pm, November 25, 2022, GMT+8

Venue: iCANX platform https://www.ican-x.com/talks

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Abstract

Synthetic polymers can exhibit a wide range of electronic, photonic, and mechanical functions. This talk will introduce the functional dielectric polymers under investigation in the Soft Materials Research Laboratory, including (1) dielectric elastomers, (2) phase-changing dielectric polymers, and (3) relaxor ferroelectric polymers with large electrocaloric effect. The dielectric elastomers (DE) are characterized with large actuation strain, high energy and power densities. A processable, high-performance dielectric elastomer has been introduced with electromechanical properties tailored to obtain maximum areal strain greater than 100% without prestretching. A hybrid stacking process enables multilayer actuators that maintain the high actuation performance of single-layer films. The phase changing in crystalline dielectric polymers enables a bistable electroactive polymer (BSEP) which is rigid at ambient temperature and behaves like a dielectric elastomer above the polymer’s phase transition temperature. The BSEP combines shape memory property with dielectrically induced actuation. It has been explored for refreshable Braille displays, smart windows, and reversible adhesives. The electrocaloric polymers are useful to design solid-state cooling devices offering important advantages over traditional cooling technologies in compactness, flexibility, COP, and voidance of greenhouse gases.

Biography

Qibing Pei is a professor of Materials Science and Engineering and affiliate professor of Mechanical Engineering at the University of California, Los Angeles. He specializes in functional polymers and nanocomposites, with over 220 peer-reviewed journal publications and 45 issued US patents. He directs the UCLA Soft Materials Research Laboratory studying artificial muscles, flexible electronic materials, plastic scintillators, and electrocaloric cooling devices. He received his B.S. degree in chemistry from Nanjing University and Ph.D. from the Institute of Chemistry, Chinese Academy of Science. He was a postdoctoral fellow at Linköping University, Sweden, and worked at UNIAX Corporation (now DuPont Display) and SRI International. He has been a full professor at UCLA since 2004. He is a Fellow of SPIE, member of ACS and MRS, Advisory or Editorial Board Member of Smart Materials & Structures, Soft Robotics, Advanced Electronic Materials, and Scientific Reports.

Source: iCANX