Thermomechanical properties in a thin film of shape memory polymer of polyurethane series

Hisaaki Tobushi; Hisashi Hara; Etsuko Yamada; Shunichi Hayashi

doi:10.1117/12.232168

9 February 1996 Thermomechanical properties in a thin film of shape memory polymer of polyurethane series

Hisaaki Tobushi, Hisashi Hara, Etsuko Yamada, Shunichi Hayashi

Proceedings Volume 2716, Smart Structures and Materials 1996: Smart Materials Technologies and Biomimetics; (1996) https://doi.org/10.1117/12.232168
Event: 1996 Symposium on Smart Structures and Materials, 1996, San Diego, CA, United States

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 T_g and low above T_g. The value of loss tangent is large in the vicinity of T_g. (2) The stress-strain curves vary significantly in the early cycles but slightly thereafter under cyclic deformation above T_g. (3) During the heating process after loading above T_g followed by unloading below T_g, strain is recovered in the vicinity of T_g. (4) Shape fixity with loading above T_g followed by unloading below T_g does not vary under thermomechanical cycling. (5) Creep strain is recovered after unloading above T_g. Creep residual strain below T_g is recovered in the vicinity of T_g 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.

Citation Download Citation

Hisaaki Tobushi, Hisashi Hara, Etsuko Yamada, and Shunichi Hayashi "Thermomechanical properties in a thin film of shape memory polymer of polyurethane series", Proc. SPIE 2716, Smart Structures and Materials 1996: Smart Materials Technologies and Biomimetics, (9 February 1996); https://doi.org/10.1117/12.232168

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