Abstract
The dielectric behaviour of epoxy and polyester laminates has been studied before and after exposing the samples to moisture (relative humidity 60 to 95%) and various exhalates (HCl, HNO3, HCOOH, CH3COOH, NH3 and SO2 vapours) which are normally released by electronic packaging materials. A strong dielectric dispersion at room temperature is observed after exposing the samples to moisture and various exhalates. The dissipation factor also increases quite appreciably, the increase being more at higher exposure times. The results have been explained in terms of the ionic conductivity due to the dissociation of the exhalates. Recovery studies have also been made and it was found that the changes were reversible except in the case of HCOOH and CH3COOH, for epoxy and in the case of NH3 for polyester. These results indicate some chemical changes in these cases.
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