Effects of Filler Shapes on the Rheological Behaviors of TPEE
Different shaped fillers exhibit different rheological responses to thermoplastic polyester elastomers(TPEE)composites.To study the rheological responses of filler shapes to TPEE,the TPEE composites with different filler shapes were prepared by adding the spherical heavy calcium carbonate(CaCO3)or lamellar talc powder to the TPEE matrix and the melt blending method.The effects of filler shapes on the shear rheology,circular channel flow behavior and die swelling of TPEE were studied by the capillary shear rheology method.The results show that,compared with the composites with spherical heavy CaCO3,the TPEE composites with lamellar talc powder have higher shear stress(or shear viscosity),smaller power-law exponent(n),more obvious pseudo plastic non-Newtonian fluid characteristics,higher wall slip rate,higher melt flow rate in the circular channel,more obvious"plug flow"behavior,smaller apparent viscous flow activation energy(Ea),and smaller die swelling ratio.The Ea of spherical heavy CaCO3/TPEE and lamellar talc powder/TPEE composites decrease with the increase of shear rate.
万方数据
维普
