Shape memory polymers (SMP) are materials that can change shape when exposed to an external stimulus, such as temperature, light, moisture or electricity [1]. Thermally-activated SMPs have a permanent shape that is provided by a crosslinked network. They can be deformed above a specific actuation temperature (T_(act)) of a second, reversible network and fixed into a temporary shape when cooled under stress to below T_(act). The temporary shape is stable until the sample is reheated to above T_(act) in the absence of an external stress, and then the material reverts to its permanent shape. SMPs have applications as medical devices (e.g., stents and sutures), actuators, sensors, artificial muscles, switches, smart textiles and self-deployable structures. A number of recent reviews have surveyed the materials and applications for SMPs.
展开▼
