Abstract
The effects of long chain branching (LCB) on the viscosity and first normal stress coefficient of metallocene polyethylene (mPE) are described. LCB increased the zero shear viscosity and the susceptibility to shear thinning. The first normal stress coefficient increased with degree of LCB at all rates. The materials with LCB followed the Cox–Merz rule and the Gleissle mirror relations while the linear material followed only the Cox–Merz rule. These results indicate that the behavior of long chain branched mPE in simple shear can be predicted using only linear viscoelastic properties.
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