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Proceedings Paper

The bending mechanism of thermoplastic polyurethane under an applied electric field
Author(s): Kai Siu Lam; Yuen Wah Wong; Liang Shiang Tai; Y. M. Poon; Franklin G. Shin
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Paper Abstract

A thin strip of thermoplastic polyurethane (PU) was found to bend to the cathode side under the application of a DC electric field. As the field was reversed, the bending went to the anode side at first and then switched back to the cathode side. The mechanism responsible for this bending and switching phenomena was investigated by means of monitoring the charging and discharging current during the application of electric field. It was found that the bending direction and magnitude can be correlated to the direction and magnitude of current flow. A detailed analysis of the current response shows that it is most likely a space charge limited current. A model based on a charge accumulation at the sample surface will also be presented in this paper. It can explain the bending as well as switching effect of the PU film. In order to visualize the charge contents in the PU film, we apply the thermally stimulated discharge current (TSDC) technique for the measurement. Our preliminary result has confirmed the existence of charged layers at the surfaces of the PU film.

Paper Details

Date Published: 28 July 2003
PDF: 8 pages
Proc. SPIE 5051, Smart Structures and Materials 2003: Electroactive Polymer Actuators and Devices (EAPAD), (28 July 2003); doi: 10.1117/12.507923
Show Author Affiliations
Kai Siu Lam, Hong Kong Polytechnic Univ. (China)
Yuen Wah Wong, Hong Kong Polytechnic Univ. (China)
Liang Shiang Tai, Hong Kong Polytechnic Univ. (China)
Y. M. Poon, Hong Kong Polytechnic Univ. (China)
Franklin G. Shin, Hong Kong Polytechnic Univ. (China)


Published in SPIE Proceedings Vol. 5051:
Smart Structures and Materials 2003: Electroactive Polymer Actuators and Devices (EAPAD)
Yoseph Bar-Cohen, Editor(s)

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