聚丙烯/易水解聚酯共混体系的流变性能研究

Study on the Rheological Behaviour of PP/EHDPET Blends

研究了聚丙烯(PP)和易水解聚酯(EHDPET)单组分以及共混体系的流变性能,考察了温度、剪切速率、异相间的相互作用、共混组成比以及相形态等对熔体黏度以及非牛顿指数的影响。结果表明:在纺丝剪切速率范围,共混熔体的黏度随剪切速率的增加而降低,且低于纯PP和EHDPET。随EHDPET及相容剂含量的增加,熔体黏度增加,分散相的平均粒径变小,流动性变差。

Rheological behavior of polypropylene （PP） and easy hydrolysis degradable polyester （EHDPET） melt blends were studied. Effect of temperature, shear rate, interface interaction, the bulk rate of blend component and the morphological structure on the viscosity and non-Newtonian index were discussed. The result showed that within the limit of the spinning shear rate, the viscosity of blends decreased with the increase of shear rate, below that of the PP and EHDPET. And increasing with the content of EHDPET and the compatilizer, the viscosity increased, the smaller the mean diameter of the dispersed phase, the worse the fluidity.