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.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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