Rheology of metallocene‐catalyzed monomodal and bimodal polyethylenes
作者： A Munoz‐Escalona , P Lafuente , JF Vega , A Santamaría , None
DOI: 10.1002/PEN.11617
关键词:
摘要: The effect of molecular architecture on the dynamic viscoelastic properties new metallocene high density polyethylenes has been analyzed. Bimodal weight distribution show features different from conventional polydisperse and bimodal polyethylenes. Higher values Newtonian viscosity (η o ) at same average (M w stronger frequency dependence (η') than in HDPE-s have observed; this leads to lower characteristic for onset non-Newtonian behavior (ω higher power law index (a). These are probably due presence very small amounts long chain branching (LCB). implications these results polymer processing analyzed comparing extrusion rheometer data, which conclusion that difficulties catalyzed can be overcome with distributions.
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