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PROPERTIES OF POLYURETHANE THIN FILMS

I. Diaconu1, D. Dorohoi2,*

Affiliation

  1. Medical Bioengineering Dept. of University of Medicine and Pharmacy, Iasi, Romania
  2. Faculty of Physics, Al.I.Cuza University, Iasi, Romania

Abstract

On the basis of the electrostatic field induced strain, dielectric and stress-strain measurements, the electromechanical properties of a polyurethane elastomer film based polyester were investigated. Up to about 7 MV/m, the induced strain showed a quadratic dependence on the applied electric field strength, which is consistent with an electrostrictive response. A strain of about 7.5 %, higher than those previously reported in the literature, was obtained. A remarkable apparent electrostrictive coefficient of about 7x10-16 m2/V2 was found. The response time of the induced strain was found less than 700 ms, which means that the deformation of film is quite fast. On the basis of the measured values of Young’s modulus and dielectric constant, the contribution of the Maxwell effect of 3.07 % was deduced. The investigated polyurethane shows some important characteristics needed in applications as actuators, sensors and transducers..

Keywords

Polyurethane elastomer, Electrostatic field induced strain, Maxwell effect, Dielectric and mechanical properties.

Submitted at: June 9, 2004
Accepted at: March 23, 2005

Citation

I. Diaconu, D. Dorohoi, PROPERTIES OF POLYURETHANE THIN FILMS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 2, pp. 921-924 (2005)