Short Circuit Depolarization Current Study in Polyvinyledenefluoride-Polymethylmethacrylate Double Layered Samples

Abstract

The depolarization current spectra for polyvinyledenefluoride (PVDF), poly methylmethacrylate (PMMA), and their double-layered samples have been recorded under different polarizing conditions. When double-layered sample is polarized at 323 K with high field, a new TSDC peak is observed that is inherent in PMMA and PVDF when considered individually. This is because of the trapping charge carriers at the PVDF–PMMA interface. The space charge peak is shifted toward the lower temperature side for the PMMA and PVDF samples; however, this trend of peak shifting was not found for double-layered samples. The trapping of charge carriers in the metal polymer interface is responsible for space charge peak. This trapping of charge carriers in polymer-polymer interface is interesting, and this process is responsible for interfacial polarization in double-layered samples.

Keywords:

• Dipolar polarization
• Interfacial polarization
• Space charge polarization
• TSDC

ACKNOWLEDGMENT

The financial support granted by the U.P. Council of Science and Technology, Lucknow (India), is gratefully acknowledged. We are also thankful to Dr. Vinay Gupta, Reader, Department of Physics and Astrophysics, North Campus, Delhi University, New Delhi, for providing the facility of vacuum coating and LCR meter. Discussions with Dr. Ranjit Singh, Prof. (Retd.), Rani Durgawati University, Jabalpur, regarding the preparation of the manuscript are gratefully acknowledged.

Notes

*DL: Double layer sample of PMMA and PVDF.