ASSESSMENT OF ELECTRICALLY ACTIVE DEFECT PARAMETERS IN POLYARYLENPHTHALIDES

Trapping state parameters in thin films of polyarylenephthalide polymers with different chemical structures were studied using the thermally stimulated current (TSC) method. As the objects of our research we used polyarylenephthalide polymers - polydiphenylphthalide (PDP) [1] and phthalide-based statistical co-polyarylene ether ketones (co-PAEK) [2]. It was revealed in the paper that the energy of trapping state activation essentially depends on the concentration of phhalide-containing fragments.

Electrical conductivity of poly(N-vinylcarbazole)-based polysodium-2,9,16,23-tetramethylamine tetracyclohexane tetrazaporphyrin composites

Efforts to improve dc-conductivity in poly(N-vinylcarbazole) (PVK) are addressed through composites. Such systems included phthalocyanine-based additives with both electronic and ionic character. We present a polysodium- 2,9,16,23-tetramethylamine tetracyclohexanetetrazaporphyrine, acting as the conductive additive in a PVK-binder. A paramagnetic behaviour appears in the additive when heated in the range 70-100°C, which induced further conductivity in the sample. Dc-electrical conductivity was studied for different PVK-additive compositions, in isothermal conditions, using a sandwich Pt/sample/Pt cell. By applying the Poole-Frenkel theory a trapping state was evidenced showing temperature and electric field dependence. An electric field of 9x104V/m establishes a frontier from which the conductivity mechanism is changed. Mobility of charge carriers was calculated according to the Mott-Gurney´s equation