Curie temperature transition according to microstructure of polymer chain in poly(VDF/TrFE/CTFE) terpolymer

In this study, terpolymer of vinylidene fluoride (VDF), trifluoroethylene (TrFE), and chlorotrifluoroethylene (CTFE) were prepared by suspension polymerization using di-tertiary-butyl peroxide (DTBP) as an initiator. The structural characteristics including microstructure and chain conformation of the polymers have been carefully elucidated as a function of the chemical composition using NMR, FT-IR. The intensity of absorption bands of the β-phase gradually decreases and the γ -phase increases with the increment of CTFE mol%. The analysis results of DSC shows that the Curie phase transition temperature (T_c) of the terpolymer gradually shifts to ambient temperature and trace becomes smaller and broader with the increment of CTFE mol%. Also, activation energies of the samples were calculated by Freeman-Carroll method.