Polymer Bulletin, Vol.50, No.3, 197-204, 2003
Rheological features and molecular architecture of polyethylenes
Compared to other polymers, highly increased melt viscosity, elasticity, and flow activation energy were observed in several chromium-based polyethylenes. Findings reported in the literature suggest that these effects could, at least theoretically, be accounted for by the polydispersity of these polyethylenes. However, the data presented here would appear to indicate a much stronger, evident connection with long chain branching than with polydispersity.