Dielectric, Piezo- and Pyroelectric Properties of the Three Crystalline Forms of PVDF

摘要

There is considerable interest in the electrical properties of the semicrystalline polymer polyvinylidene fluoride (PVDF), because its piezo- and pyroelectric response are the highest of all polymers known today. The strength of the piezo- and pyroelectric response of PVDF depends strongly on its crystalline form. Of these there are three, known as alpha, beta, and gamma. The authors have investigated PVDF films in which one of the forms predominates by means of dielectric, piezo- and pyroelectric measurements. The measurements were performed in a range of temperatures at a frequency of about 0.3 Hz.