✦ LIBER ✦

Dielectric properties of novel poly(aryl prehnitimide)s

✍ Scribed by Craig Zaluski; Gu Xu; Yu Qi; Zhi Yuan Wang

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 439 KB
Volume: 34
Category: Article
ISSN: 0887-6266
DOI: 10.1002/(sici)1099-0488(199603)34:4<731::aid-polb14>3.0.co;2-i

No coin nor oath required. For personal study only.

✦ Synopsis

Six different variants of a new type of polyimide, poly(ary1 prehnitimide)s, containing various moisture contents have been studied using dielectric relaxation spectroscopy. Dielectric loss measurements show the presence of a double peak near 200 K (depending on frequency) due to water relaxation. The two peaks have been designated y1 and yz. The yz peak appears as a shoulder on the y1 peak at lower temperatures and is very sensitive to moisture content. The y1 peak is less sensitive to moisture content and is associated with isolated water molecules coupled to the polymer chains. Both of the y-relaxation peaks were studied in detail to obtain the associated activation energies.

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