Abstract: The rheological properties of poly(trimethylene terephthalate) /montemorillonite(PTT/MMT) composites prepared by melt blending were studied using capillary rheometer. It showed that PTT and PTT/MMT melts were all pseudo-plastic fluids, and the addition of 1%~3% MMT could obviously improve the flow property of the composites. The non-Newtonian index of the composites was higher than that of PTT. The apparent viscosity of the composite was lower than that of PTT, and their flow behavior was better than that of PTT, so the composites could be processed at lower temperature. The viscous flow activation energy of the composite was higher than that of PTT, and it was more proper for the composite to improve their flow properties by increasing temperature.

Key words: poly(trimethylene terephthalate), montmorillonite, composite, rheological property