Shape Memory Polymers:
Shape Memory Polymers is a smart material which changes in response to its environment, E.G. the wrapping on a DVD cover is a shape memory polymer. In short, Shape memory polymer is Shrink-Wrap.
Shrink Wrap is made from Polymers, here are some steps on how it is made; -Heat the Polyethene until it becomes a soft and floppy thick liquid. The molecules are now coiled together randomly -Cool the liquid quickly, as it cools, quickly stretch the polymer to make a thin film of solid, the molecules are now stretched -Heat the thin film. The stretched molecules suddenly return to their coiled shaped. The film shrinks and wraps tightly around the DVD case