Shape‐Memory PVDF Exhibiting Switchable Piezoelectricity

In this study, a material is designed which combines the properties of shape‐memory and electroactive polymers. This is achieved by covalent cross‐linking of polyvinylidene fluoride. The resulting polymer network exhibits excellent shape‐memory properties with a storable strain of 200%, and fixity as well as recovery values of 100%. Programming upon rolling induces the transformation from the nonelectroactive α‐phase to the piezoelectric β‐phase. The highest β‐phase content is found to be 83% for a programming strain of 200% affording a d 33 value of −30 pm V −1 . This is in good accordance with literature known values for piezoelectric properties. Thermal triggering this material does not only result in a shape change but also renders the material nonelectroactive.