Persistent internal polarization in poly(ethylene terephthalate) films. VI. Orientation and conductivity in amorphous material

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Abstract
Amorphous films of poly(ethylene terephthalate), commercially extruded but unoriented, are nevertheless shown to possess orientations that can be thermally depolarized. Conductivity studies on such films, subsequent to depolarization, have shown that, as with the commercial, oriented material, protons are the charge carriers. Comparison with commercial films shows that intentional biaxial orientation decreases both the pre-exponen-tial and exponential terms in the conductivity equation.

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