Shape memory polymers
First introduced in Japan and then the United States 1984, shape memory polymers are polymers whose qualities have been altered to give them dynamic shape "memory" properties. Using thermal stimuli, shape memory polymers can exhibit a radical change from a rigid polymer to a very elastic state, then back to a rigid state again. In its elastic state, it will recover its "memory" shape if left unrestrained. However, while pliable it can be stretched, folded or otherwise conformed to other shapes, tolerating up to 200% elongation.
Source: crgrp.netAdded: 7 June 2006