Dielectric Response of Aramid Fiber-Reinforced PEEK

✍ Scribed by Nina Korbakov; Hannah Harel; Yuri Feldman; Gad Marom

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 298 KB
• Volume: 203
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200290000

✦ Synopsis

Abstract

Dielectric spectroscopy was applied for the first time to aramid fiber‐reinforced PEEK, wherein the effect of the fiber on the dielectric response was examined for both amorphous and crystalline poly(ether ether ketone) (PEEK) over wide temperature and frequency ranges. Whereas the temperature behavior of the dielectric losses of the materials exhibited the typical α and β processes of PEEK, the specific effect of the fibers in the crystalline PEEK was revealed in shifting the α process to a higher temperature. The unique effect of the fibers was expressed by a significantly higher activation energy and lower dielectric strength for the α relaxation, reflecting a higher constraint level that is imposed by the fiber. It is proposed that this additional constraint is associated with fiber generated transcrystallinity.
Scanning electron micrograph of transverse fracture surface of crystallized unidirectional aramid fiber‐reinforced PEEK.

magnified imageScanning electron micrograph of transverse fracture surface of crystallized unidirectional aramid fiber‐reinforced PEEK.