Dielectric Spectroscopy of Makrofol KG Using Heavy Ion Irradiation
High energy heavy ion irradiation of polymers affects their dielectric constant and loss factor. Structural changes produced in the polymer owing to the breaking of its long molecular chains by heavy ions are responsible for such modifications in the polycarbonate plastic. Dielectric constant and loss factor are studied by irradiating samples with 85 MeV 16O and 80 MeV 28Si ions with the fluence which varied from 1x1011 to 1x1013 ions/cm2. The study is carried out for different frequencies of the applied electrical field ranging from 1 kHz to 100 kHz both for the pristine and ion irradiated samples. In comparison, we find that the ε′r(ω) values for 16O irradiation sample decreases than those with the ε′r(ω) values for the 28Si irradiated sample at the same dose and temperature series. This indicates that various kind of chemical species are formed in polycarbonate on irradiation with Oxygen and Silicon ions. Activation energy in the case of pristine, 85 MeV 16O and 100 MeV 28Si ion irradiated samples are respectively found to be 102.1kJ/mol, 214.4 kJ/mol and127.6 kJ/mol.
Activation Energy, Dielectric Loss, Pelletron Accelerator
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