Structure and Deformational Behavior of Poly(vinylidene fluoride) Hard Elastic Films

Ivan Dmitriev¹, Vili Bukošek², Viktor Lavrentyev¹, Galina Elyashevich¹*
¹ Institute of Macromolecular Compounds, Russian Academy of Sciences, 31 Bolshoi pr., Saint-Petersburg 199004, Russia;
² University of Ljubljana, Faculty of Natural Sciences and Engineering, Snežniška 5, Ljubljana 1001, Slovenia;
E-mail: elya@hq.macro.ru

Abstract
Effect of annealing on the structure and mechanical properties of melt extruded PVDF films was studied by X-ray scattering, tensile testing, cycling loading, ultrasonic propagation and dynamic mechanical analysis. It has been found that the annealed films prepared at a melt draw ratio higher than 30 and annealed at the temperature close to the melting point exhibit hard elastic properties. Elastic recovery of the annealed PVDF films was about 60%.

Keywords: Poly(vinylidene fluoride); extrusion; annealing; hard elastic films; lamellar structure.