Polyetherimide is an amorphous thermoplastic resin with a high glass t
ransition temperature. It is characterized by high heat resistance and
mechanical properties, which make it suitable for industrial applicat
ion. Two different polyetherimides (varying by chemical formula) were
investigated, in terms of their dielectric strength and space charge b
ehaviour. The comparison reveals important variations in the electric
properties. (C) 1998 SCI.