SOME PROPERTIES OF COMPOSITES BASED ON TETRAFLUOROETHYLENE-HEXAFLUOROPROPYLENE COPOLYMER WITH WHITE RICE HUSK ASH AND KINETICS OF ITS THERMOOXIDATIVE DEGRADATION

摘要

Some properties of composites based on tetafluoroethylene-hexafluoropropylene copolymer filled with different quantities of white rice husk ash have been studied. With increase of filler content, the tensile strength and elongation of the composites sharply decreased while the Young modulus did not change significantly. The thermooxidative degradation kinetics of tetrafluoroethylene-hexafluoropropylene copolymer and its composites was studied by non-isothermal differential thermal analysis at different heating rates. The values of apparent activation energy E, pre-exponential factor A in the Arrhenius equation, as well as the changes of entropy ΔS*, enthalpy ΔH* and free Gibbs energy ΔG* for the formation of the activated complex from the reagent were calculated.