Conference 12042 > Paper 12042-27
Paper 12042-27

The origin of contraction of twisted polymer fiber muscles and whether the cause is entropic elasticity or thermal expansion

Abstract

In recent years, polymer fiber actuators obtained by twisting polymer fibers have attracted much attention. These actuators actuate due to the reversible axial thermal shrinkage and radial thermal expansion of untwisted fibers. This paper introduces some recently discovered experimental facts of thermal contraction and explains our new model regarding the actuation principle [Kimura et al., Sens. Actuators. B, 2021]. In particular, we deny that the entropy elasticity is the main cause of the thermal shrinkage of fibers, which has been considered until now, based on experimental facts, and provide a new idea that the amorphous expansion is driving force.

Presenter

Tokyo Institute of Technology (Japan)
He was born in Tokyo, Japan in 1996. He received a master’s degree from Tokyo Institute of Technology in 2021. He is currently Ph. D. student at Tokyo Institute of Technology. His research interest includes fiber science, carbon fiber, and composites.
Presenter/Author
Tokyo Institute of Technology (Japan)
Author
Nagoya Univ. (Japan)
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Toyohashi Univ. of Technology (Japan)
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Kyushu Univ. (Japan)
Author
DENSO Corp. (Japan)
Author
DENSO Corp. (Japan)
Author
Tokyo Institute of Technology (Japan)
Author
Tokyo Institute of Technology (Japan)