Anionic Aliphatic Polyesteramide Copolymers: Evaluation of Dielectric Properties

This study looks at the effects on the dielectric behavior as result of the incorporation of ester sequences along the nylon 6 chains. The aliphatic polyesteramide copolymers and nylon 6 homopolymer were synthesized via anionic ring-opening copolymerization using the rotational molding technique by varying the ratio of the ε-caprolactam (CLA) and ε-caprolactone (CLO) comonomers. The ester units are correlated with biodegradable potential of polymers and the polar amide groups are able both to confer the polymer semicrystalline character and to be sensitive to the electric stimulus. The dielectric properties of the anionic nylon 6 and polyesteramides have been carried out as a function of frequency (100 Hz-106 Hz), at ambient temperature. Regarding to dielectric permittivity, ε*(f), it was observed that the samples exhibit same behavior at increasing of the frequency. Experimental data revealed that the real part of electric modulus, M'(f) of the copolymers are many lower than those corresponding of the homopolymer. The presence of a single arc in the complex impedance plane plots confirms that, within the studied frequency range, the samples have a highly capacitive behavior. The results related to dielectric, crystalline and thermal properties of copolymers were compared with those obtained for homopolymer.