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Electrostriction of a Polyurethane Elastomer-Based Polyester

2006; IEEE Sensors Council; Volume: 6; Issue: 4 Linguagem: Inglês

10.1109/jsen.2006.877978

1558-1748

I. Diaconu, Dana Ortansa Dorohoi, Florin Topoliceanu,

Ferroelectric and Piezoelectric Materials

This paper is dealing with the electromechanical properties of a synthesized polyurethane elastomer film-based polyester. On the basis of the electrostatic-field induced strain, dielectric, and stress-strain measurements carried out under ambient conditions, the electromechanical parameters such as thickness strain, apparent electrostrictive coefficient, effective pressure, mechanical energy density, and Maxwell-effect contribution, were determined. Thickness strain versus the static electric field showed a quadratic dependence up to about 6.3 MV/m, which is consistent with an electrostrictive response. The maximum induced strain of 7% obtained at 16 MV/m is higher than those reported in the literature on unprestrained polyurethane film with noncompliant electrodes. Remarkable apparent electrostrictive coefficient $(sim 7.75 10^-16 hboxm^2/hboxV^2)$ and response time (600 ms) were found. Under the actual experimental conditions (rigid electrodes and maximum electrostatic field of 16 MV/m), the effective compressive pressure (0.9 MPa) and mechanical energy density (0.032 $hboxJ/cm^3$ ) values are quite noticeable. A small Maxwell-effect contribution of only 0.32% was found. The electromechanical parameters of this polyurethane elastomer indicate that this material is potentially useful for practical actuators and sensors.