A novel cross-linked polyimide film: synthesis and dielectric properties

Deligoz H., Ozgumus S., Yalcinyuva T., Yildirim S., Deger D., Ulutas K.

POLYMER, cilt.46, sa.11, ss.3720-3729, 2005 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 46 Sayı: 11
  • Basım Tarihi: 2005
  • Doi Numarası: 10.1016/j.polymer.2005.02.097
  • Dergi Adı: POLYMER
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.3720-3729
  • Anahtar Kelimeler: polyimide, dielectric constant, AC conductivity, ELECTRICAL-PROPERTIES, CONSTANT POLYIMIDES, THIN-FILMS, RELAXATION, FLUORINE
  • İstanbul Üniversitesi Adresli: Evet

Özet

A novel cross-linked polyimide (CPI) has been prepared by imidization of cross-linked poly(amic acid) (CPAA). In this work, the Ac conductivity and dielectric properties of this polyimide are presented comparitively with those of conventional polyimide (PI), in the 0.2-100 kHz frequency range and 300-463 K temperature interval. Although the frequency and temperature dependencies of dielectric constant of both conventional and cross-linked polyimides show the same behaviour, the dielectric constant of CPI takes lower values. The Ac conduction studies suggest that electron hopping is responsible for conduction of the PI and CPI films. The activation energy calculated in 296-353 K temperature interval and the β-relaxation was also observed for CPI. © 2005 Elsevier Ltd. All rights reserved.