Evaluation of degradation in polyimide by recovery voltage measurement

A. Yamaguchi, Wei Wei, N. Hirai, Y. Ohki, E. Zaima, S. Okabe

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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 H2O 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.

Original languageEnglish
Pages (from-to)216-220
Number of pages5
JournalConference on Electrical Insulation and Dielectric Phenomena (CEIDP), Annual Report
Publication statusPublished - 2001 Jan 1

ASJC Scopus subject areas

  • Building and Construction
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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