Phase transition study of ferroelectric copolymers by infrared spectroscopy in the submillimetric region

Publisher Website
Google Scholar
Abstract
The infrared submillimetric technique is used to study phase transitions in Poly(vinylidene fluoride) and in Poly(vinylidene fluoride-trifluorethylene) copolymers. Copolymerization presents two important effects on the chain polarizability and thus on the submillimetric absorption spectra:The reduction of the chain polarizability linked to the introduction of TrFE units (less polar than the VDF ones); -From 20% to 40% in mole TrFE the copolymers present the TT conformation, more polar than the TG+TG- one presented for lower comonomer contents.The observed variations of the absorption coefficient (α) and of the imaginary part of the dielectric constant (ε“) are typically a combination of these effects associated to the presence of crystalline absorption bands.