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Effects of transitional phenomena on the electric field induced strain–electrostrictive response of a segmented polyurethane elastomer
Author(s) -
Su J.,
Zhang Q. M.,
Kim C. H.,
Ting R. Y.,
Capps R.
Publication year - 1997
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19970815)65:7<1363::aid-app14>3.0.co;2-w
Subject(s) - electrostriction , materials science , polyurethane , elastomer , electric field , dielectric , composite material , glass transition , strain (injury) , temperature coefficient , stress (linguistics) , field (mathematics) , transition temperature , condensed matter physics , polymer , piezoelectricity , physics , medicine , linguistics , philosophy , mathematics , optoelectronics , quantum mechanics , pure mathematics , superconductivity
The electromechanical properties of a segmented polyurethane elastomer were investigated as functions of temperature and frequency. Two transitional phenomena were observed in the temperature range from ‐50 to 85°C. In these transition regions, the electric field induced strain coefficient exhibits large increases, which indicate that the effect of the transition processes is significant. The experimental analysis suggests that the transitional processes in the polyurethane are related to the chain‐segment motions. From the elastic compliance and the dielectric constant data, the contribution of the uniform Maxwell stress was determined. It was found that the contribution of the Maxwell stress effect to the measured strain coefficient increased from about 10% below the glass transition temperature ( T g ) (∼ ‐25°C) to about 50 and 35% for the frequencies of 10 and 100 Hz, respectively, at ∼ 40°C, which is above T g . The large difference between the measured strain response and the calculated Maxwell stress effect indicates a significant contribution to the field‐induced strain from other mechanisms, such as electrostriction. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65: 1363–1370, 1997