Abstract
Until now, getting non-porous pure PVDF in the piezoelectric β-phase involved the application of stresses that limit the production of piezoelectric films into a flat form. In this work we present a new method to obtain, directly from the melt, pure β-PVDF which also allows the production of films with a 3D shape. A hydrophilic ionic liquid (IL), C2mim BF4, is used to totally induce the direct crystallization of PVDF in the piezoelectric β-phase during the melt. Afterwards, this IL is completely removed by washing the film in water at 70 °C. The process results in the production of a non-porous pure PVDF film, totally crystallized in the β-phase. Finally and for the first time, the replication of a 3D shape given by a glass form could be demonstrated by using this polymer.
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