零切变粘度η_0是聚丙烯熔体流变性能的一个基本物理量,零切变粘度-分子量关系不仅具有理论上的兴趣,而且也有较大的实用意义。在文献中零切变粘度通常都是用毛细管粘度计数据外推求得的,但是由于聚丙烯熔体有较强的非牛顿性,即使在毛细管粘度计测量下限测得的粘度仍表现出明显的切变速率依赖性。因此,难于用外推的方法 Zero-shear viscosity η_0 is a rheological property of polypropylene melt a basic physical quantity, zero-shear viscosity-molecular weight relationship is not only of theoretical interest, but also of great practical significance. Zero shear viscosities are generally extrapolated using capillary viscometer data in the literature, but due to the greater non-Newtonian nature of the polypropylene melt, the viscosities measured at the lower limit of the capillary viscometer still show significant Shear rate dependence. Therefore, it is difficult to extrapolate the method