Abstract:

The thermally stimulated current of polypropylene is studied using methods of linear and step rising temperature, frozen charges, and residual polarization. For α and β peaks, the frozen charge method gives excellent resolving power and symmetry line shape. There are contributions of fast and slow polarization mechanisms to the thermally stimulated current, but the line shape is determined mainly by the slow mechanism. The slow polarizations originate from the interaction of the segment movement in a long chain with the bounded space charges.

Key words: Polypropylene, Thermally stimulated current, Slow polarization