Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/22065
Title: Dependency of the shape memory properties of a polyurethane upon thermomechanical cyclic conditions
Authors: Hu, JL 
Ji, FL
Wong, YW
Keywords: Dynamic mechanical properties
Polyurethane
Shape memory
Thermomechanical properties
Issue Date: 2005
Publisher: John Wiley & Sons Ltd
Source: Polymer international, 2005, v. 54, no. 3, p. 600-605 How to cite?
Journal: Polymer International 
Abstract: The relationship between the shape memory properties and thermomechanical cyclic conditions was investigated with a type of shape memory polyurethane (SMPU). The thermal and dynamic mechanical properties of the polyurethane were examined by using differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). It was found that the SMPU exhibited good shape memory effects (SMEs) at deformation temperatures ranging from Tg to Tg + 25 °C. The strain recovery ratios increased with the increase of deformation speed and with the decrease in maximum strain. The recovery ratios also increased with increasing fixing speed. Therefore, in practical applications, in order to obtain better SMEs, the SMPU should be cooled to its frozen state as soon as possible after being deformed at a high temperature. The 'fixity' dramatically increased with the decrease in fixing temperature. To obtain optimal SMEs, the polymer has to be reheated up to the temperature at which the polymer deformed. In addition, the recovery ratios of the SMPU could increase slightly with the increase of recovery time.
URI: http://hdl.handle.net/10397/22065
ISSN: 0959-8103
DOI: 10.1002/pi.1745
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