Abstract
The dielectric loss tangent tan δ for the plasma polymerized styrene film has been investigated between room temperature and 250 °C over a frequency range of 102–104 Hz. As-polymerized films exhibited a noticeable peak on the tan δ temperature characteristic in vacuo. The temperature giving the maximum of tan δ shifted to a higher temperature with descending frequency and the peak disappeared once the sample was heated to 250 °C. These behaviors can not be understandable from the usual dielectric relaxation. As a candidate for their origin, the process of further polymerization of the residual low molecular moieties containing oxidized products by heating has been considered.
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