ISSN:
0887-6266
Keywords:
poly(aryl prehnitimide)s
;
bent diimide
;
ac impedance
;
dielectric constant
;
permittivity
;
loss tangent
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Six different variants of a new type of polyimide, poly(aryl 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 γ1 and γ2. The γ2 peak appears as a shoulder on the γ1 peak at lower temperatures and is very sensitive to moisture content. The γ1 peak is less sensitive to moisture content and is associated with isolated water molecules coupled to the polymer chains. Both of the γ-relaxation peaks were studied in detail to obtain the associated activation energies. © 1996 John Wiley & Sons, Inc.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
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