Abstract
The thermal depolarization of amorphous PET (polyethylene terephthalate) electrets metallized on one side and corona charged at T/sub p/>70 degrees C exhibits, between 20 degrees C and 105 degrees C, three relaxations: alpha , rho /sub 1/ and rho /sub 2/. The origin of rho /sub 2/ is free charge injected from the electrodes, while rho /sub 1/ could be associated with a uniform bulk mechanism. The p/sub 1/ peak has a been located in electrets metallized on both sides and polarized, between 73 degrees C and 79 degrees C, only in the isothermic phase, so that at T/sub p/>79 degrees C it overlaps with rho . The stimulated crystallization by thermal steps in amorphous PET samples, metallized on both sides, indicates that rho /sub 1/ changes with the crystallinity and becomes the alpha /sub c/ relaxation of the crystalline PET. >
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