Aging Effect and Induced Electric Phenomena on Dielectric Materials Irradiated With High Energy Electrons
Résumé
The high radiation dose received by space used
polymers may greatly alter their electric properties. This effect
could, for instance, reduce significantly radiation-induced conductivity (RIC) leading to high charging risks that were not
predicted from pristine sample. For an optimized qualification
and prediction, it is therefore highly important to characterize
the charging properties of polymers and their evolution as a
function of the received dose. This paper aimed at studying
aging of electric properties of four different polymers (Teflon
FEP, Kapton, polyepoxy DP 490 adhesive, and silicon QS1123
adhesive) at high dose level (105 and 106 Gy). We have been able
to demonstrate that aging could lead to the reduction of RIC on
some polymers (for polyepoxy and silicone adhesives, and FEP)
or inversely to the increase of RIC on others (e.g., Kapton).
Ionization effect must, however, be considered in the analysis
of the results. Relaxation processes could drastically affect the
charging profile and macroscopic electric properties.
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