Polymer that exhibits a change in dielectric properties on application of pressure.
Polymer that shows a change in its dimensions when subjected to an electric field.
Source: PAC, 2004, 76, 889. 'Definitions of terms relating to reactions of polymers and to functional polymeric materials (IUPAC Recommendations 2003)' on page 901 (https://doi.org/10.1351/pac200476040889)