Abstract: Systematic measurement of dielectric constant (ε) and loss (tanδ) on powder pressed pellets of MH and AA,MAA and MBA copolymers in composition 50/50 have been carried out in the frequency range 200Hz-100kHz and in the temperature range from room temperature to 180oC covering through the glass transition temperature, Tg. Two sets of relaxation peaks one slightly above room temperature and the other slightly above Tg are noticed from tanδ versus temperature curves for different frequencies. The peaks are attributed to β- and α- relaxations. The enhanced dielectric property in MH-MAA in comparison with MH-AA is due to the presence of α-methyl group in the methacrylamide....
Keywords: Dielectric constant (ε), Dielectric loss (tanδ) , AC conductivity. Relaxation, segmental motion
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