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Theoretical study of sorption-induced bending of polypyrrole films

✍ Scribed by Hidenori Okuzaki; Takayoshi Kuwabara; Toshio Kunugi

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
205 KB
Volume
36
Category
Article
ISSN
0887-6266

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✦ Synopsis

Polypyrrole films containing perchlorate were electrochemically synthesized and the bending and recovery motion of the films obtained has been investigated. It was found that the thickness of the film and ambient relative humidity (RH) were crucial to the motion of film: An increase of the film thickness decreased the displacement of the bending but increased the bending stress. On the other hand, an increase of the ambient RH decreased both functions. The motion of film was caused by the difference of expansion on both sides of the film owing to anisotropic sorption of water vapor, which could be expressed by the diffusion-limited bending model. The diffusion coefficients calculated from the bending and recovery motion at 25Β°C, RH 50% were 12.2 Ο« 10 Οͺ8 cm 2 s Οͺ1 and 3.5 Ο« 10 Οͺ8 cm 2 s Οͺ1 , respectively. The maximum expansion of the film surface calculated from the bending curve was about 0.36%.

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