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Proceedings Paper

Thermomechanical properties in a thin film of shape memory polymer of polyurethane series
Author(s): Hisaaki Tobushi; Hisashi Hara; Etsuko Yamada; Shunichi Hayashi
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Paper Abstract

The thermomechanical properties of a thin film of shape memory polymer of polyurethane series were investigated experimentally. The results were summarized as follows: (1) Modulus of elasticity and yield stress are high below glass transition temperature Tg and low above Tg. The value of loss tangent is large in the vicinity of Tg. (2) The stress-strain curves vary significantly in the early cycles but slightly thereafter under cyclic deformation above Tg. (3) During the heating process after loading above Tg followed by unloading below Tg, strain is recovered in the vicinity of Tg. (4) Shape fixity with loading above Tg followed by unloading below Tg does not vary under thermomechanical cycling. (5) Creep strain is recovered after unloading above Tg. Creep residual strain below Tg is recovered in the vicinity of Tg during the heating process. (6) About a half of initial stress relaxes after a certain duration of time. Several applications of the polymers were introduced.

Paper Details

Date Published: 9 February 1996
PDF: 12 pages
Proc. SPIE 2716, Smart Structures and Materials 1996: Smart Materials Technologies and Biomimetics, (9 February 1996); doi: 10.1117/12.232168
Show Author Affiliations
Hisaaki Tobushi, Aichi Institute of Technology (Japan)
Hisashi Hara, Aichi Institute of Technology (Japan)
Etsuko Yamada, Aichi Institute of Technology (Japan)
Shunichi Hayashi, Mitsubishi Heavy Industries, Ltd. (Japan)


Published in SPIE Proceedings Vol. 2716:
Smart Structures and Materials 1996: Smart Materials Technologies and Biomimetics
Andrew Crowson, Editor(s)

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