Arylidene polymers. VI. Gamma irradiation effects on the electrical conductivity behavior, IR absorption spectra, and DSC measurements of some new synthesized poly(arylidenecycloalkanones)

摘要

AbstractGamma irradiation effects on the electrical conductivity behavior of some new synthesized poly(2,5‐arylidenecyclopentanone)1, poly(2,6‐arylidenecyclohexanone)2, and their co‐polymers3, have been investigated. Thermal studies over the temperature range 300‐500 K showed that the conductivity behavior follows a two‐term Arrhenius‐type equation. The first term has a small activation energy and predominates at lower temperature (extrinsic region), and the second term with higher activation energy predominates at higher temperatures (intrinsic region). Change in the activation parameters with the change in the γ‐ray dose and the nature of the polymers are discussed. The IR absorption spectra showed a decrease in the intensity of most bands of the γ‐irradiated samples. A mechanism based on the formation of trapped free radicals and their recombination has been suggested. DSC measurements indicated that the crystallization and the melting temperature transitions decreased in size considerably with the increase in the γ‐ray dose until they nearly disappeared