Thermomechanical properties of shape memory polymer of polyurethane series and their applications

Hisaaki Tobushi; Hisashi Hara; Etsuko Yamada; Shunichi Hayashi

doi:10.1117/12.237154

26 April 1996 Thermomechanical properties of shape memory polymer of polyurethane series and their applications

Hisaaki Tobushi, Hisashi Hara, Etsuko Yamada, Shunichi Hayashi

Proceedings Volume 2779, 3rd International Conference on Intelligent Materials and 3rd European Conference on Smart Structures and Materials; (1996) https://doi.org/10.1117/12.237154
Event: 3rd International Conference on Intelligent Materials, 1996, Lyon, France

Abstract

The thermomechanical properties of a thin film of shape memory polymer of polyurethane series were investigated experimentally. The results are 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 recovers in the vicinity of T_g. (4) Shape fixity with loading after T_g followed by unloading below T_g does not vary under thermomechanical cycling. Several applications of the polymer are introduced.

Citation Download Citation

Hisaaki Tobushi, Hisashi Hara, Etsuko Yamada, and Shunichi Hayashi "Thermomechanical properties of shape memory polymer of polyurethane series and their applications", Proc. SPIE 2779, 3rd International Conference on Intelligent Materials and 3rd European Conference on Smart Structures and Materials, (26 April 1996); https://doi.org/10.1117/12.237154

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