Shape-memory polymers

✍ Scribed by Marc Behl; Andreas Lendlein

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 543 KB
• Volume: 10
• Category: Article
• ISSN: 1369-7021
• DOI: 10.1016/s1369-7021(07)70047-0

✦ Synopsis

Shape-memory polymers are an emerging class of active polymers that have dual-shape capability. They can change their shape in a predefined way from shape A to shape B when exposed to an appropriate stimulus. While shape B is given by the initial processing step, shape A is determined by applying a process called programming. We review fundamental aspects of the molecular design of suitable polymer architectures, tailored programming and recovery processes, and the quantification of the shape-memory effect. Shape-memory research was initially founded on the thermally induced dual-shape effect. This concept has been extended to other stimuli by either indirect thermal actuation or direct actuation by addressing stimuli-sensitive groups on the molecular level. Finally, polymers are introduced that can be multifunctional. Besides their dual-shape capability, these active materials are biofunctional or biodegradable. Potential applications for such materials as active medical devices are highlighted.