Effects of addition of hindered phenol compounds to a segmented polyurethane with shape memory on mechanical yielding
| Autor: | Koh-hei Nitta, Takanobu Kawamura, Mizue Kuriyagawa, Shunichi Hayashi |
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| Rok vydání: | 2010 |
| Předmět: |
Yield (engineering)
Materials science Mechanical Engineering Composite number Shape-memory alloy Crosshead Matrix (chemical analysis) chemistry.chemical_compound chemistry Mechanics of Materials Ultimate tensile strength General Materials Science Deformation (engineering) Composite material Polyurethane |
| Zdroj: | Journal of Materials Science. 46:1264-1271 |
| ISSN: | 1573-4803 0022-2461 |
| DOI: | 10.1007/s10853-010-4910-9 |
| Popis: | 金沢大学理工研究域自然システム学系 金沢大学大学院自然科学研究科 The mechanical yielding behavior of the shape memory polyurethane (SMP) and its composite samples were investigated to verify the effect of addition of hindered phenol. The composite samples were prepared using SMP as matrix and hindered phenol (AO-80) as filler, and then tensile tests were carried out at a range of temperatures and with different fixed crosshead speeds. According to the tensile data at 25 °C, the yield stress was increased by adding AO-80. In terms of the Eyring theory, the activation volume of deformation units decreased with increase of the amount of AO-80 added. This is because the packing of the hard segments is enhanced by addition of AO-80. Consequently, it was suggested that the yield process is caused by the rotation of hard segment domains within the deformed plastic domains composed of glassy soft segments. © 2010 Springer Science+Business Media, LLC. |
| Databáze: | OpenAIRE |
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