Accession Number:

ADA429645

Title:

"Telechelic" Ferroelectric Fluoro Terpolymers With High Chemical Reactivity and Large Electromechanical Response at Ambient Temperature

Descriptive Note:

Conference paper

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s):

• Chung, T. C.
• Petchsuk, A.

Report Date:

2003-06-01

Pagination or Media Count:

14.0

Abstract:

This paper discusses a new family of telechelic ferroelectric polymorphs fluoroterpolymers having OH and COOH terminal groups. The polymer backbone comprises of vinylidene difluoride VDF, trifluoroethylene TrFE, and a small amount of chlorinecontaining third monomers. The slightly bulky chlorine atoms serve as the kinks, which alters the chain conformation from all-trans Beta-phase to tttgtttg- gamma -phase, without reducing crystallinity. Consequently, the terpolymers exhibit low Curie temperature, high dielectric constant 80 and large electrostrictive response 5 at ambient temperature. On the other hand, the reactive terminal groups provide the terpolymers chemical reactivity to form super-structures that may further enhance their electric performance.

Descriptors:

• *ELECTROMECHANICAL DEVICES
• *CHEMICAL REACTIONS
• *FERROELECTRIC MATERIALS
• *POLYMORPHISM
• TEMPERATURE
• POLYMERS
• ATOMS
• DIELECTRIC PROPERTIES
• ELECTRIC POWER
• CURIE TEMPERATURE
• FLUORIDES
• CHLORINE
• FLUORINE COMPOUNDS
• CONFORMITY
• VINYL PLASTICS

Subject Categories:

• Industrial Chemistry and Chemical Processing
• Polymer Chemistry
• Non-electrical Energy Conversion

Distribution Statement:

APPROVED FOR PUBLIC RELEASE