THERMAL-ANALYSIS OF POLY(VINYLIDENE FLUORIDE) (PVDF) IN COMPOSITES WITH POLYPYRROLE (PPY)

The melting behavior and dynamic mechancial properties of poly(vinylid ene fluoride) (PVDF) in composites with polypyrrole (PPy) have been in vestigated using DSC/DTA and a Rheovibron viscoelastometer. Composites with varying percentages of PPy (5-50%) were synthesized using a solu tion-casting method with FeCl3 as the oxidant. It was observed that th e melting point of PVDF increased as the percent of PPy was increased. A plot of tan delta vs. temperature showed the shift of the alpha rel axation peak to higher temperature. These results, together with our e arlier studies on the basis of XRD and IR, indicate molecular interact ion, an antiplasticization effect of PPy, and partial phase transforma tion of PVDF to phase I (beta form). (C) 1994 John Wiley & Sons, Inc.