Title :
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
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;
Conference_Titel :
Electrets, 1996. (ISE 9), 9th International Symposium on
Conference_Location :
Shanghai
Print_ISBN :
0-7803-2695-4
DOI :
10.1109/ISE.1996.578154
