Electroactive shape memory composites with TiO2 whiskers for switching an electrical circuit

Electroactive shape memory composites with TiO2 whiskers for switching an electrical circuit In this paper, electrically actuated shape memory composites were prepared by compounding shape memory polyurethane (SMPU) with conductive antimony-doped tin oxide/TiO2 (ATO/TiO2) whiskers. The resultant composites, ATO/TiO2/SMPU, can be activated by electric voltages because of heating Joule and enhancement of heating efficiency by the conductive network resulting from the overlaps of whiskers. In addition to conductivity, ATO/TiO2/SMPU composites featured lighter color than most electroactive shape memory composites, which exhibit black color due to the addition of carbon materials. The composites exhibited uniform electrical resistance and rapid heat transfer performances. When the composites with 50wt% ATO/TiO2 whiskers were used in a switch electric circuit as the switch, the circuit can turn off within 30s. ATO/TiO2 whiskers improved Young's moduli by at least 390% and recovery stresses by more than 250% compared with pristine SMPU. Although the recovery rates were unsatisfactory in the first test cycle, composites with 40wt% ATO/TiO2 whiskers and 50wt% ATO/TiO2 whiskers still showed recovery rates higher than 96% and 94% in the third cycle, respectively. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Materials & design Elsevier

Electroactive shape memory composites with TiO2 whiskers for switching an electrical circuit

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Publisher
Elsevier
Copyright
Copyright © 2018 Elsevier Ltd
ISSN
0264-1275
eISSN
0141-5530
D.O.I.
10.1016/j.matdes.2018.02.005
Publisher site
See Article on Publisher Site

Abstract

In this paper, electrically actuated shape memory composites were prepared by compounding shape memory polyurethane (SMPU) with conductive antimony-doped tin oxide/TiO2 (ATO/TiO2) whiskers. The resultant composites, ATO/TiO2/SMPU, can be activated by electric voltages because of heating Joule and enhancement of heating efficiency by the conductive network resulting from the overlaps of whiskers. In addition to conductivity, ATO/TiO2/SMPU composites featured lighter color than most electroactive shape memory composites, which exhibit black color due to the addition of carbon materials. The composites exhibited uniform electrical resistance and rapid heat transfer performances. When the composites with 50wt% ATO/TiO2 whiskers were used in a switch electric circuit as the switch, the circuit can turn off within 30s. ATO/TiO2 whiskers improved Young's moduli by at least 390% and recovery stresses by more than 250% compared with pristine SMPU. Although the recovery rates were unsatisfactory in the first test cycle, composites with 40wt% ATO/TiO2 whiskers and 50wt% ATO/TiO2 whiskers still showed recovery rates higher than 96% and 94% in the third cycle, respectively.

Journal

Materials & designElsevier

Published: Apr 5, 2018

References

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