Thermally stimulated current in elongated linear low density polyethylene irradiated by gamma-ray

We observed three TSC peaks at the temperature of 33 deg C, 42 deg C and 58 deg C from linear low density polyethylene which had been excited by γ-ray or electric field. Especially further experiment on elongated sample showed that the peak at 42 deg C increased until the draw ratio reached 200 %, but decreased above 200%. These peaks are closely related to the traps of the crystalline, amorphous and crystal interfacial regions. As a result of elongation non-uniformity of molecular chains caused physical cavities at the crystal interfacial region. There fore the depth of the trap changed and the rate of the release of the carriers were increased. Because of the elongation the splitted phenomena of the lamellae structure of the sample has been suggested by the infrared absorption spectra of the elongated linear low density polyethylene film at the room temperature. (Author)