含PBT的成纤高聚物共混物研究 Ⅱ.共混物的挤出物胀大行为

Studies on Fiber-Forming Polymer Blends Containing PBT Ⅱ. Die Swell Behavior of Extruded Blends

本文测定了PBT/PP、PBT/PA6和PBT/PET三种共混体系共混物的挤出物胀大比。研究表明,各种共混物的挤出物胀大比在不同温度下均随切应力的增大而增大,并且在一定的切应力下有温度的依赖性,共混物的挤出胀大并非纯是弹性响应。

The die swell ratios of three blend systems, PBT/PP, PBT/PA6 and PBT/PET, have been measured using an Instron 3211 Capillary Rheometer. The results show that the die swell ratios of various blends increase with the increase of shear stress at different te mperatures, and exhibit the dependence on temperature under a certain shear stress The die swell behavior of blends is not a pure elastic responce.