Journal
POLYMER INTERNATIONAL
Volume 66, Issue 3, Pages 418-427Publisher
WILEY
DOI: 10.1002/pi.5275
Keywords
piezoresistivity; vapor-grown carbon fiber; micro beads foaming agent; tactile sensor; percolation threshold; recovery time
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Funding
- Kitagawa Industries Co. Ltd.
- Advanced Low Carbon Technology Research and Development Program (ALCA) of the Japan Science and Technology Agency (JST), Japan
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Due to the growing demand for tactile sensors, the possibility of detecting an external uniaxial pressure by the piezoresistive measuring of a conductive filler/elastomer composite was investigated. A series of piezoresistive models are discussed. Novel highly sensitive piezoresistive foams with excellent elasticity were fabricated using vapor-grown carbon fiber (VGCF), two-component silicone elastomer and a newtype of thermally expandable micro beads foaming agent to overcome the disadvantages of the silicone elastomer in the utilization of a tactile sensor. Deformations of the foams caused by uniaxial pressure were observed using scanning electron microscopy from cross-sections. Effects of the VGCF and the foaming agent on the piezoresistivitiy were investigated. The piezoresistive mechanisms of the foams are discussed according to the measurements, and good fit was found between the theoretical calculations and the experimental piezoresistivity measurements. It is found that the addition of the micro beads foaming agent can improve the piezoresistivity of the VGCF/silicone foam and increase the sensitivity and repeatability for its application in a tactile sensor. (C) 2016 Society of Chemical Industry
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