High Power Electronics Institute, RF of SUNY 150-4758A (ONR2c).
Abstract
An investigation is conducted to study and model the aging of polypropylene, a widely used polymer dielectric in energy storage and transport devices, under the sequential application of thermal and DC electrical stresses. Continuous thermal aging in air was carried out at temperatures of 90 deg C and 110 deg C for aging times of 100, 300, and 500 hours. The DC lifetimes of the control (thermally unaged) and thermally aged films were then obtained at four voltage stress levels of 16, 15, 14 and 13 kV. Testing of a sufficiently large number of randomly chosen specimens in a well designed test plan allows for the analysis of all the effects of stress factors independently and interactively. A complete statistical analysis of the data included nonparametric and parametric assessment of adequate life distributions and life-stress models (linear and nonlinear) utilizing Least Squares and Maximum Likelihood regression methods. Several diagnostic tests, including Electron Scattering for Chemical Analysis (ESCA), Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM), Fourier Transformed Infrared (FTIR) and Nuclear Magnetic Resonance (NMR) spectroscopy, Wide Angle X-ray Diffraction (WAXS), plus other mechanical and electrical characterizations including DC breakdown voltage, dielectric constant, dissipation factor, tensile stress and strain, and Young's Modulus, for the control and aged samples were carried out. Results were then compared to detect any correlating changes and interpreted in the light of available aging theories. jg p16
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1996
- Accession Number
- ADA303833
Entities
People
- George Lee
- Javaid Laghari
- Jim Sarjeant
Organizations
- University at Buffalo