Dielectric spectroscopy of polycarbosilazane-based CuCl2 metallopolymers

ABSTRACT A series of poly (carbosilazane-CuCl2) metallopolymers was prepared by the reaction of varying amounts (5% to 30%) of anhydrous CuCl2 with polycarbosilazane, [–(CH3)2SiNH(CH2)2NH–]n, matrix in tetrahydrofuran under continuous sonication. Dielectric measurements were performed at room temperature (25°C) in the frequency range 1 Hz to 106 Hz. It was found that the ac conductivity increases with increasing the CuCl2 up to 16% and then starts to dramatically decrease. The results reveal that all the dielectric parameters such as ac impedance, dielectric permittivity, and electric modulus behave similar to that observed in ac conductivity. (i.e., maximum or minimum depends on the considered dielectric parameter). It is suggested that at low concentration of metal content, all the CuCl2 is uniformly bound to the backbone of the polymer chains, where the conduction mechanism in the system is by electrons jumping (carrier hopping between the chains), whereas at high metal content the coordination capacit...