Title :
Evaluation of degradation in polyimide by recovery voltage measurement
Author :
Yamaguchi, A. ; Wei, Wei ; Hirai, Naoshi ; Ohki, Y. ; Zaima, E. ; Okabe, S.
Author_Institution :
Waseda Univ., Tokyo, Japan
Abstract :
Polyimide (PI) has been widely used for insulation in motors, integrated circuits, electric wire, cable, and so on, due to its high mechanical strength, thermal stability, chemical stability, and radiation resistance. We have examined the degradation of API (all-aromatic polyimide) and TPI (thermoplastic polyimide) soaked in H 2O or KOH by measuring recovery voltage. The peak value of the recovery voltage was found to depend on the soaking time. We have developed a theoretical equation of recovery voltage, and have found that the peak value of recovery voltage is a function of the dielectric constant. By measuring the recovery voltage, it is possible to diagnose the degradation of API and TPI
Keywords :
organic insulating materials; permittivity; polymers; H2O; KOH; all-aromatic polyimide; dielectric constant; insulation degradation; polyimide; recovery voltage; soaking time; thermoplastic polyimide; Cable insulation; Circuit stability; Dielectric measurements; Dielectrics and electrical insulation; Polyimides; Thermal degradation; Thermal resistance; Thermal stability; Voltage measurement; Wire;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 2001 Annual Report. Conference on
Conference_Location :
Kitchener, Ont.
Print_ISBN :
0-7803-7053-8
DOI :
10.1109/CEIDP.2001.963825
