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Polarization Stability of Amorphous Piezoelectric Polyimides

Published online by Cambridge University Press:  10 February 2011

C. Park ,
Z. Ounaies ,
J. Su ,
J. G. Smith Jr.  and
J. S. Harrison
C. Park
Affiliation:
ICASE
Z. Ounaies
Affiliation:
Advanced Materials and Processing Branch, NASA Langley Research Center, Hampton VA, 23681–2199.
J. Su
Affiliation:
ICASE
J. G. Smith Jr.
Affiliation:
National Research Council
J. S. Harrison
Affiliation:
National Research Council
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Abstract

Amorphous polyimides containing polar functional groups have been synthesized and investigated for potential use as high temperature piezoelectric sensors. The thermal stability of the piezoelectric effect of one polyimide was evaluated as a function of various curing and poling conditions under dynamic and static thermal stimuli. First, the polymer samples were thermally cycled under strain by systematically increasing the maximum temperature from 50°C to 200°C while the piezoelectric strain coefficient was being measured. Second, the samples were isothermally aged at an elevated temperature in air, and the isothermal decay of the remanent polarization was measured at room temperature as a function of time. Both conventional and corona poling methods were evaluated. This material exhibited good thermal stability of the piezoelectric properties up to 100°C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 600: Symposium FF – Electroactive Polymers , 1999 , 153
Copyright
Copyright © Materials Research Society 2000

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