STUDIES ON POLYMERS HAVING HIGH DIELECTRIC-CONSTANT .3. STUDIES ON DIELECTRIC AND CONDUCTIVE PROPERTIES OF POLYMERIC CHARGE-TRANSFER COMPLEXES .2. TCNQ SALTS OF BLOCK POLYMERS CONTAINING POLYCATION SEQUENCES

The synthesis of several new TCNQ (tetracyanoquinodimethane) salts of block ionene polymers where polycation sequences are broken by copolymerizing a long sequence of a polyether prepolymer, and their conductive and dielectric properties are reported. The polymers obtained are flexible and have improved mechanical properties. The complex TCNQ salts exhibit low specific resistivity (about 104Ωcm) and a high dielectric constant (about 103) at room temperature. The dispersion of the dielectric constant is observed in all polymers and the activation energies for the polarization process agree very closely with those of electrical conduction. These electrical properties of TCNQ salts of block ionene polymers can be properly explained in terms of the new structural model previously proposed for the TCNQ salts of ionene polymers. In the block polycation—TCNQ salts, TCNQ molecules are packed randomly in the complex polycation network and form conduction paths which differ from hitherto considered long columns with face-to-face stacked TCNQ molecules along the polymer chain, because the polycation sequences are broken by the introduction of polyether prepolymer units. Taking the conduction paths of short isolated ones as the microscale conducting particles dispersed in an insulating matrix, the dielectric property of the polymers is qualitatively explained by the Maxwell—Wagner type polarization. © 1978, The Society of Polymer Science, Japan. All rights reserved.