Abstract
A new family of
cellular polymers - that, upon appropriate charging, reveals interesting
piezoelectric properties - has been developed recently. Its major
characteristic is thermal stability up to high temperatures, which
broadens the potential field of application. These materials become
electrets upon charging under high levels of electric field.
Investigation of charging mechanisms is fundamental to reach
optimization of electret arid piezoelectric properties. This paper
presents results and considerations relevant to contact charging of
these new materials, pointing out the relation between partial discharge
and space charge formation, as well as time and temperature stability
of electret properties. The concepts of threshold for partial discharge
inception and space charge accumulation, the modeling of avalanches in
cavities, and the rate of charge generation are exploited trying to
explain charging mechanism and. therefore, they provide useful
indication for optimization of material manufacturing.
| Original language | English |
|---|---|
| Pages (from-to) | 2088 - 2095 |
| Number of pages | 8 |
| Journal | IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control |
| Volume | 52 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 2005 |
| MoE publication type | A1 Journal article-refereed |