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

Daisuke Kimura; Toshihira Irisawa; Kentaro Takagi; Kenji Tahara; Daichi Sakurai; Haruhiko Watanabe; Wataru Takarada; Masatoshi Shioya

doi:10.1117/12.2612843

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

Daisuke Kimura, Toshihira Irisawa, Kentaro Takagi, Kenji Tahara, Daichi Sakurai, Haruhiko Watanabe, Wataru Takarada, Masatoshi Shioya

Control Systems

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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 contraction and radial thermal expansion of untwisted fibers. In this study, thermal contraction of the two polyamides, PA6 and PA610, fibers were investigated. The fiber length of both fibers changed reversibly in response to temperature change, but there was no initial load dependence on the amount of contraction. These results indicate that this thermal contraction is not due to the entropic elasticity effect seen in rubber. In addition, the thermal contraction was larger for PA610, which has a larger thermal expansion coefficient in the amorphous state. This suggests that the thermal expansion of the amorphous state was converted by its fiber structure into expansion in the diameter direction and contraction in the fiber axial direction [Kimura et al., Sens. Actuators B Chem., 2021].

Original language	English
Title of host publication	Electroactive Polymer Actuators and Devices (EAPAD) XXIV
Editors	Iain A. Anderson, John D. W. Madden, Herbert R. Shea
Publisher	SPIE
ISBN (Electronic)	9781510649590
DOIs	https://doi.org/10.1117/12.2612843
Publication status	Published - 2022
Event	Electroactive Polymer Actuators and Devices (EAPAD) XXIV 2022 - Long Beach, United States Duration: Apr 6 2022 → Apr 11 2022

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	12042
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Electroactive Polymer Actuators and Devices (EAPAD) XXIV 2022
Country/Territory	United States
City	Long Beach
Period	4/6/22 → 4/11/22

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

Access to Document

10.1117/12.2612843

Cite this

Kimura, D., Irisawa, T., Takagi, K., Tahara, K., Sakurai, D., Watanabe, H., Takarada, W., & Shioya, M. (2022). The origin of contraction of twisted polymer fiber muscles: whether the cause is entropic elasticity or thermal expansion. In I. A. Anderson, J. D. W. Madden, & H. R. Shea (Eds.), Electroactive Polymer Actuators and Devices (EAPAD) XXIV Article 120420P (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 12042). SPIE. https://doi.org/10.1117/12.2612843

The origin of contraction of twisted polymer fiber muscles: whether the cause is entropic elasticity or thermal expansion. / Kimura, Daisuke; Irisawa, Toshihira; Takagi, Kentaro et al.
Electroactive Polymer Actuators and Devices (EAPAD) XXIV. ed. / Iain A. Anderson; John D. W. Madden; Herbert R. Shea. SPIE, 2022. 120420P (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 12042).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Kimura, D, Irisawa, T, Takagi, K, Tahara, K, Sakurai, D, Watanabe, H, Takarada, W & Shioya, M 2022, The origin of contraction of twisted polymer fiber muscles: whether the cause is entropic elasticity or thermal expansion. in IA Anderson, JDW Madden & HR Shea (eds), Electroactive Polymer Actuators and Devices (EAPAD) XXIV., 120420P, Proceedings of SPIE - The International Society for Optical Engineering, vol. 12042, SPIE, Electroactive Polymer Actuators and Devices (EAPAD) XXIV 2022, Long Beach, United States, 4/6/22. https://doi.org/10.1117/12.2612843

Kimura D, Irisawa T, Takagi K, Tahara K, Sakurai D, Watanabe H et al. The origin of contraction of twisted polymer fiber muscles: whether the cause is entropic elasticity or thermal expansion. In Anderson IA, Madden JDW, Shea HR, editors, Electroactive Polymer Actuators and Devices (EAPAD) XXIV. SPIE. 2022. 120420P. (Proceedings of SPIE - The International Society for Optical Engineering). doi: 10.1117/12.2612843

Kimura, Daisuke ; Irisawa, Toshihira ; Takagi, Kentaro et al. / The origin of contraction of twisted polymer fiber muscles : whether the cause is entropic elasticity or thermal expansion. Electroactive Polymer Actuators and Devices (EAPAD) XXIV. editor / Iain A. Anderson ; John D. W. Madden ; Herbert R. Shea. SPIE, 2022. (Proceedings of SPIE - The International Society for Optical Engineering).

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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 contraction and radial thermal expansion of untwisted fibers. In this study, thermal contraction of the two polyamides, PA6 and PA610, fibers were investigated. The fiber length of both fibers changed reversibly in response to temperature change, but there was no initial load dependence on the amount of contraction. These results indicate that this thermal contraction is not due to the entropic elasticity effect seen in rubber. In addition, the thermal contraction was larger for PA610, which has a larger thermal expansion coefficient in the amorphous state. This suggests that the thermal expansion of the amorphous state was converted by its fiber structure into expansion in the diameter direction and contraction in the fiber axial direction [Kimura et al., Sens. Actuators B Chem., 2021].",

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AU - Sakurai, Daichi

AU - Watanabe, Haruhiko

AU - Takarada, Wataru

AU - Shioya, Masatoshi

N1 - Funding Information: Part of this work was supported by JSPS KAKENHI, Grant Numbers JP 17H03204 and 20H00610. We would like to thank the Mikawa Textile Research Center for their cooperation in the preparation of the fibers. Publisher Copyright: © 2022 SPIE.

PY - 2022

Y1 - 2022

N2 - In recent years, polymer fiber actuators obtained by twisting polymer fibers have attracted much attention. These actuators actuate due to the reversible axial thermal contraction and radial thermal expansion of untwisted fibers. In this study, thermal contraction of the two polyamides, PA6 and PA610, fibers were investigated. The fiber length of both fibers changed reversibly in response to temperature change, but there was no initial load dependence on the amount of contraction. These results indicate that this thermal contraction is not due to the entropic elasticity effect seen in rubber. In addition, the thermal contraction was larger for PA610, which has a larger thermal expansion coefficient in the amorphous state. This suggests that the thermal expansion of the amorphous state was converted by its fiber structure into expansion in the diameter direction and contraction in the fiber axial direction [Kimura et al., Sens. Actuators B Chem., 2021].

AB - In recent years, polymer fiber actuators obtained by twisting polymer fibers have attracted much attention. These actuators actuate due to the reversible axial thermal contraction and radial thermal expansion of untwisted fibers. In this study, thermal contraction of the two polyamides, PA6 and PA610, fibers were investigated. The fiber length of both fibers changed reversibly in response to temperature change, but there was no initial load dependence on the amount of contraction. These results indicate that this thermal contraction is not due to the entropic elasticity effect seen in rubber. In addition, the thermal contraction was larger for PA610, which has a larger thermal expansion coefficient in the amorphous state. This suggests that the thermal expansion of the amorphous state was converted by its fiber structure into expansion in the diameter direction and contraction in the fiber axial direction [Kimura et al., Sens. Actuators B Chem., 2021].

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

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