A Review on Piezoelectricity, Polling and their Measuring Methods in Semi Crystalline Polymers

Piezoelectric materials have been used in manufacturing of piezoelectric sensors. Actually, sensors are the electromechanical converters which convert mechanical waves and forces into electrical signals and conversely. Piezoelectric property was firstly discovered in ceramics. However, because of the need to piezoelectric materials with large surfaces and high flexibility in many applications, and also because of the relatively low price and facile manufacturing technology of polymers in comparison with ceramics, polymers are the material of the choice that have been more studied. Piezoelectric polymeric sensors and actuators offer the advantage of processing flexibility because they are lightweight, tough, readily manufactured into large areas, and can be cut and formed into complex shapes. Accordingly, in this review article, at first piezoelectric property and characteristics requirements for piezoelectric polymers (the mechanism and key components required for developing piezoelectricity in semi crystalline polymers) are studied, and then various polling methods of piezoelectric polymers and different methods for measuring piezoelectric response are described.