Shunichi Hayashi

TL;DR: In this paper, the thermomechanical properties of a thin film of shape memory polymer of polyurethane series were investigated experimentally, based on the experimental results, the dynamic mechanical properties, cyclic deformation properties at high temperature, thermal cycling properties, creep and stress relaxation are discussed.

TL;DR: A nonlinear thermomechanical constitutive model of shape memory polymer (SMP) is developed by modifying a linear model that expresses well the thermomechamical properties of polyurethane-shape memory polymer, such as shape fixity, shape recovery and recovery stress.

TL;DR: In this article, a thermomechanical constitutive model was developed by modifying a standard linear viscoelastic model for shape memory polymer of polyurethane series, in order to describe the thermodynamic properties of shape memory.

TL;DR: In this paper, the shape fixity and recovery in a polyurethane polysilicon film was investigated by the thermomechanical cycling tests with loading at various temperatures, and the results were summarized as follows: (1) Strain is recovered at temperatures in the vicinity of the glass transition temperature Tg for loading above Tg, but it is recovered in the midpoint temperature of glass transition for loading below Tg.

TL;DR: A shape memory polymer foam which takes on a deformed shape and an as-molded shape was shown to recover its original shape when the polymer foam is heated to a temperature higher than the glass transition point (Tg) of the polymer as discussed by the authors.