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Titolo:
Hysteresis in bending electrostriction of polyurethane films
Autore:
Watanabe, M; Suzuki, M; Hirako, Y; Shirai, H; Hirai, T;
Indirizzi:
Shinshu Univ, Fac Text Sci & Technol, Ueda, Nagano 3868567, Japan Shinshu Univ Ueda Nagano Japan 3868567 chnol, Ueda, Nagano 3868567, Japan Nitta Ind Corp, Narayama Lab, Nara 6310801, Japan Nitta Ind Corp Nara Japan 6310801 orp, Narayama Lab, Nara 6310801, Japan
Titolo Testata:
JOURNAL OF APPLIED POLYMER SCIENCE
fascicolo: 6, volume: 79, anno: 2001,
pagine: 1121 - 1126
SICI:
0021-8995(20010207)79:6<1121:HIBEOP>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRIC-FIELD; ELASTOMER; BEHAVIOR;
Keywords:
bending electrostriction; hysteresis; polyurethane; actuator; ionic polarization;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Hirai, T Shinshu Univ, Fac Text Sci & Technol, 3-15-1 Tokida, Ueda, Nagano3868567,Japan Shinshu Univ 3-15-1 Tokida Ueda Nagano Japan 3868567 868567,Japan
Citazione:
M. Watanabe et al., "Hysteresis in bending electrostriction of polyurethane films", J APPL POLY, 79(6), 2001, pp. 1121-1126

Abstract

This report presents the mechanism and unique features of hysteresis in bending electrostriction of polyurethane films. The films were made of segmented polyester-polyurethanes and coated with a thin gold electrode on both surfaces. The application of a 2-MV/m electric field to the 0.2-mm-thick film caused a bending deformation, which showed hysteresis. The hysteresis wasclosely related to the absorption current, suggesting that its origin is ionic polarization attributed to ionic impurities in the polyurethane. The existence of ionic polarization after the removal of the electric field was shown by measuring a thermally stimulated discharge current. In addition, acouple of unique features of the hysteresis in the bending deformation aredescribed. One of the features is that the prior application of an electric field significantly improves the bending speed in the successive application. The other is that the prior application also controls the bending direction in the subsequent application of an electric field of opposite polarity. (C) 2000 John Wiley & Sons, Inc.

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Documento generato il 05/12/20 alle ore 14:18:20