Influence of water on dielectric relaxations of a mica-glass fiber/epoxy composite

Author

Fois, Magali ; Guuinic, Philippe ; Lacabanne, Colette

Author_Institution

Lab. de Phys. des Polymeres, Univ. Paul Sabatier, Toulouse, France

fYear

1996

fDate

25-30 Sep 1996

Firstpage

539

Lastpage

544

Abstract

The influence of water on dielectric properties of a mica-glass fiber/epoxy composite has been studied with Thermally Stimulated Currents (TSC) in the temperature range [-130°C,+30°C]. Global spectra were recorded for hydrated and dehydrated states of the same sample. In the hydrated sample, two relaxation modes at 0°C and -35°C (β) were observed. The 0°C mode has been ascribed to the relaxation of free water molecules trapped into clusters. The β mode is found in the dehydrated sample global spectrum. In the two cases, a compensation phenomenon in the same temperature range is observed. Water acts like an antiplasticizer for this mode

Keywords

dielectric losses; dielectric relaxation; glass fibre reinforced plastics; mica; solvation; thermally stimulated currents; β mode; -130 to 30 C; antiplasticizer; clusters; compensation phenomenon; dehydrated sample; dielectric relaxation; free water molecule relaxation; global TSC spectra; hydrated sample; mica-glass fiber/epoxy composite; relaxation modes; thermally stimulated currents; water influence; Aging; Composite materials; Density estimation robust algorithm; Dielectric materials; Dielectric measurements; Glass; Nonhomogeneous media; Polymers; Temperature distribution; Water;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1996. (ISE 9), 9th International Symposium on

Conference_Location

Shanghai

Print_ISBN

0-7803-2695-4

Type

conf

DOI

10.1109/ISE.1996.578154

Filename

578154