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Effect of anisotropic thermal expansion on the torsional actuation of twist oriented polymer fibres
ARC Centre of Excellence for Electromaterials Science and Australian Institute for Innovative Materials, University of Wollongong, Innovation Campus, Squires Way, North Wollongong, NSW, Australia.
School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW, Australia.
ARC Centre of Excellence for Electromaterials Science and Australian Institute for Innovative Materials, University of Wollongong, Innovation Campus, Squires Way, North Wollongong, NSW, Australia.
ARC Centre of Excellence for Electromaterials Science and Australian Institute for Innovative Materials, University of Wollongong, Innovation Campus, Squires Way, North Wollongong, NSW, Australia.
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2017 (English)In: Polymer, ISSN 0032-3861, E-ISSN 1873-2291, Vol. 129, p. 127-134Article in journal (Refereed) Published
Abstract [en]

Torsional actuation of twisted polymer fibres is the basis for high performance tensile actuation when these fibres are formed into coils. The thermally-induced torsional actuation of twisted polyamide-6 fibres can be predicted by a single helix approximation when the measured diameter and length direction thermal expansion coefficients are known. The single helix model illustrates the sensitivity of the magnitude of torsional actuation to the volume expansion anisotropy for a given volume change. The applicability of the model has been further assessed by investigating three polymer fibres that display different thermal expansion anisotropies. Commercially available polyethylene, polypropylene and polyamide-6 fibres were twisted to the maximum extent without coiling and then heat treated to fix the twisted structure. Heating the twisted fibres between 26 and 62 °C resulted in a partial untwist which was reversed during cooling. The single-helix model of the twisted fibres was used to accurately predict the torsional stroke based on the measured fibre length and diameter change during heating. Comparative torsional stroke of twisted polyamide-6, polyethylene and polypropylene was explained in terms of materials thermo-physical properties. Generated blocked torques was also correctly predicted by the single-helix model when combined with the measured fibre torsional stiffness. Variances between torsional stiffnesses were found to be dependent of different anisotropic thermal properties of tested fibres.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 129, p. 127-134
Keywords [en]
Twisted fibre, Torsion, Actuation
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-151322DOI: 10.1016/j.polymer.2017.09.052ISI: 000413400200013Scopus ID: 2-s2.0-85030178864OAI: oai:DiVA.org:liu-151322DiVA, id: diva2:1248846
Available from: 2018-09-17 Created: 2018-09-17 Last updated: 2018-09-26Bibliographically approved

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Aziz, Shazed
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