Intellectual Property Office
Non-Confidential Disclosures
"Ferroelectric Fluoropolymers with Chemically Tunable Dielectric Constants
and Processes Thereof"
PSU Invention Disclosure No. 2006-3163
Field of the Invention/Key Words:
High dielectric constant polymers, ferroelectric fluoropolymers, capacitors, energy storage
Inventor:
Q. Wang, et al
Background:
As commercial and consumer requirements for compact electric power systems such as in hybrid electric vehicles and defibrillators grows substantially over the past decade, development of high energy density and light-weighted capacitors becomes one of the major enabling technology. High dielectric constant polymers are attractive for making energy storage devices smaller and lighter, while the flexibility of molecular design and synthesis make it possible to fine-tune the physical properties of polymers to meet the requirements of technologically significant applications.
Invention description:
The subject invention provides a novel synthetic process of making ferroelectric fluoropolymers that exhibit tunable and high dielectric constants at application temperatures ranging from 20 to 150o C. The resulting fluoropolymers have a composition containing vinylidene fluoride (VDF), trifluoroethlyene (TrFE) and chlorotrifluoroethylene (CTFE) as well as other suitable components. The inventors have shown that this preparation process offers a low-cost and scaleable process for ferroelectric fluoropolymers with precisely controlled molecular structures and physical properties. The researchers have shown that the dielectric constants and Curie temperatures of the resulting polymers can be accurately controlled over a wide range. The compositions of the resulting polymers were confirmed using 1H and 19F NMR and elemental analysis. These polymers’ room-temperature dielectric constants range from 12 to 50 measured at 1 kHz, while the dielectric losses are less than 0.05. The dielectric peaks are dependent upon frequency and temperature. Polymer thin films have been prepared with a thickness of twenty to forty (20-40) microns.
Advantages:
The higher dielectric constant of these polymers is advantageous for capacitors, especially those having a relatively small size and high capacitance requirement. Potential commercial applications include, but are not limited to, high-K gate dielectrics for integrated circuits and portable electronics, high energy density capacitors for stationary power generation, hybrid electric vehicles, alternative energy storage including energy harvesting, medical devices such as defibrillators, and telecommunication equipments such as mobile phones
Contact:
Matthew D. Smith
Sr. Licensing Officer
Intellectual Property Office
The Pennsylvania State University
113 Technology Center
University Park, PA 16802-7000
Phone: (814) 863-1122
Fax: (814) 865-3591
E-mail: mds126@psu.edu
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