Abstract
The shape fixity and recoverability in a thin film of shape memory polymer of the polyurethane series were investigated using the thermomechanical cycling tests with loadings at various temperatures. The results are summarized as follows. (1) During the heating process under no load, strain is recovered at temperatures in the vicinity of the glass transition temperature Tg in the case of loadings at Tg and Tg+20K, but in the case of loadings at Tg-20K it is recovered at temperatures in the vicinity of Tmg. (2) The rate of strain recovery is about 98%, except for the early cycles in the case of loadings at Tg and Tg+20K, while it decreases with increasing cycles in the case of loading at Tg-20K. (4) The thermomechanical properties of materials with different Tg are quite alike in spite of the difference in Tg.
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