Spontaneous current of polyethersulfone investigated through the measurement of space charge distribution by the pulsed electroacoustic method and thermally stimulated current

In the temperature range from 0/spl deg/C to 230/spl deg/, the authors show that polyethersulfone (PES) has two TSC peaks, /spl alpha/ and /spl beta/. A spontaneous current is also observed even in the sample to which electric field has never been applied. The spontaneous current and TSC /spl alpha/ peak are caused by the non-uniformly distributed space charges in the sample which were created during the manufacturing process.