Abstract: Poly(tetrafluoroethylene-co-hexafluoropropylene)/nano calcium carbonate (FEP/nano-CaCO3) composites were prepared by melt blending method. The nonisothermal crystallization behavior of the FEP and FEP/nano-CaCO3 composites were investigated by differential scanning calorimetry (DSC). Moreover, the nonisothermal crystallization kinetics was carried out and analyzed by Jeziorny, Ozawa, and Mo methods. It was confirmed that the nonisothermal crystallization of FEP and FEP/nano-CaCO3 could be described by the above kinetic equation except Ozawa method. The analysis showed that the initial and maximum crystallization temperatures of FEP/nano-CaCO3 composites were higher than those of neat FEP at the same cooling rate, and the addition of nano-CaCO3 extended the crystallization half time. The nano-CaCO3 promoted the nucleation of FEP, however, decreased the overall crystallization rate of the FEP.

Key words: poly(tetrafluoroethylene-co-hexafluoropropylene), nano calcium carbonate, nonisothermal crystallization kinetics