Abstract
In this paper, the processing-structure-property (P-S-P) behavior and trade-offs observed with three LLDPE resins made from chromium, metallocene and Ziegler-Natta catalysts were examined and critically compared. The basic molecular and rheological properties were examined. The blown film performance of these resins was examined with respect to the effects of film thickness and molecular orientation on film properties. Also, the processability of these resins was compared through an examination of the typical extrusion and film blowing processing parameters. Finally, an attempt was made to highlight the advantages and disadvantages of each resin type as they apply to blown film applications. The results demonstrate that LLDPE resins from these various catalysts are dramatically different in nature, thereby resulting in different trade-offs with respect to their P-S-P behavior in film blowing.
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