Ferroelectric studies in stretched and corona charged SAN films

• Published in: 10th International Symposium on Electrets (ISE 10). Proceedings (Cat. No.99 CH36256) pp. 659 - 662
• Main Authors: Hundal, J.S., Nath, R.
• Format: Conference Proceeding
• Language: English
• Published: New York NY IEEE 1999
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Corona; Dielectric, piezoelectric, ferroelectric and antiferroelectric materials; Dielectrics; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; Ferroelectric films; Ferroelectric materials; Ferroelectricity and antiferroelectricity; Glass; Hysteresis; Physics; Polarization; Polymers; organic compounds; Storage area networks; Temperature distribution; Thermal factors; Polarization; Corona discharges; Polymers; Ferroelectric properties; Dielectric relaxation
• ISBN: 9780780350250; 0780350251
• DOI: 10.1109/ISE.1999.832132

Ferroelectric properties in the stretched and corona poled films of poly(styrene-co-acrylonitrile) were investigated. The D-E hysteresis loops were studied in the stretched SAN films (S=2.5X) corona poled at poling field E/sub p//spl ap/45 MV/m and poling temperature T/sub p/=85/spl deg/C in the temperature range 28 to 115/spl deg/C. The remanent polarization and coercive field were found to decrease with temperature. A phase transition from ferroelectric to paraelectric is believed to be taking place in the film in the vicinity of its glass transition temperature T/sub g//spl ap/112/spl deg/C. The dielectric relaxation of the order of 13 has been obtained in these films. The application of Frohlich theory to the thermally stimulated current results for the SAN films poled under identical conditions provides the value of orientational correlation factor g/spl ap/1.6 which corroborates the cooperative motion of dipoles in these films and explains its ferroelectric behaviour.