Events

Description:

Synthesis of New Thermally Crosslinkable PP and PVDF Copolymers:  Applications in High Energy Density Thin Film Capacitors

Prof. T.C. Mike Chung
Dept. of Materials Science and Engineering
The Pennsylvania State University

Abstract

In this presentation, I will discuss two new polymer dielectrics based on cross-linked polypropylenes (PP-x) and PVDF-based fluoropolymers, representing two different polarization mechanisms, which are used in the fabrication of high energy density capacitors for energy storage and power conditions. Both polymers were prepared by our propriety chemical processes, including a combination of rac-metallocene catalyst and a T-reagent for PP-x polymers and the borane-mediated control radical polymerization for fluoropolymers. The details of synthesis and structure characterization will be discussed in my talk. The current state-of-the-art capacitor technology is based on metallized bi-axially oriented polypropylene (BOPP) films that exhibit many desirable properties, but only are capable of achieving low energy storage density (1-2 J/cm3). In the past few years, I have applied new PP-x polymers with good thin film forming and polymer chain orientation capabilities. The resulting polymer thin films show excellent mechanical and thermal stability, and exhibit high breakdown strength (>800 MV/m), fast charge-discharge cycles, and high energy density (>10 J/cm2) without increasing energy loss (<1%). On the other hand, we took another approach by investigating high dielectric fluoropolymers based on PVDF terpolymers with relaxed ferroelectric properties. These terpolymers possess nano-size polar crystals and high crystallinity and show high dielectric constant (>60, 1kHz) with Curie temperature (~30 oC). The terpolymer capacitor exhibits no remnant polarization at zero electric field, which is suitable for operating under both AC and DC sources, and displaying high energy storage density (>20 J/cm3) but with some energy loss (~20%).

Speaker Background

Professor Chung obtained his B. S. degree in Chemistry from Chung Yuan University (Taiwan) in 1976. He came to the U.S. for his graduate study in the Department of Chemistry, University of Pennsylvania in 1979. After finishing his Ph.D work in 1982 on conducting polymers (with Professor A. J. MacDiarmid, Nobel Laureate), he spent two years as a Research Scientist at the Institute for Polymers and Organic Solids (with Professor Alan J. Heeger, Nobel Laureate), University of California, Santa Barbara. Between 1984 and 1989, he was a Senior Research Staff member in Corporate Research, Exxon Company. In 1989 he joined the faculty of the Pennsylvania State University as an associate professor and became professor of Polymer Science in the Department of Materials Science and Engineering in 1993. Professor Chung is interested in the development of new polymer chemistry that can lead to new materials with unique chemical and physical properties. One major theme of his current research is the development of new materials that enable “green” energy technology. He is author of more than 240 papers, including 55 US and international patents.

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Date:

Wedneday, September 23

Location:

Michael's Restaurant at Shoreline Park
2960 N Shoreline Blvd
Mountain View, CA  94043
Directions  Map

Timing:

6 PM social hour
7 PM dinner
8 PM lecture

Cost:

 
Lecture-only is free.

Payment:

We accept cash or checks, but are unable to accept payment by credit card at this time. Payment is taken at the door.  No-shows are responsible for full payment of registration fee.

Registration:

Please register on the web page https://ggpf.mystagingwebsite.com/ or contact:
Clayton Henderson
email: Clayton.Henderson -at- HitachiGST.com
phone: (408) 717-6599

Deadline for registration:

5PM, Tuesday September 15 for early registration discount
5PM, Tuesday September 22 for registration (or until venue has reached capacity.)

Dinner Selections:

Salmon filet with beurre blanc
Chicken with herbed butter
Eggplant Parmagiana

You should receive confirmation of your registration; if not, please contact us again.