Structural dependence of the electrical conductivity of polyethylene terephthalate

The electrical properties of polymeric materials depend not only on the chemical composition but also on the structural features associated with the type and degree of molecular order. In the fabrication of polymeric films and fibers various thermal and mechanical treatments alter the physical structure, resulting in profound effects on the electrical properties such as conductivity, specific inductive capacity and dielectric loss. Herein are discussed the relationship between structural variables and the direct current conductance in films from polyethylene terephthalate. This polyester, which is the condensation polymer from ethylene glycol and terephthalic acid, is known commercially in the oriented, crystalline film form as "Mylar"∗ polyester film.