Effect of long chain branching on rheological properties of metallocene polyethylene

Polyethylenes (PE) with long chain branching (LCB) densities up to 0.44 carbons/10 000 carbons and narrow molecular weight distributions were synthesized using a continuous stirred-tank reactor (CSTR) with the Dow Chemical's constrained geometry catalyst system, CGC-Ti/TPFPB/MMAO, in Isopar E solution at 500psig and 140–190°C. Rheological properties of these metallocene polyethylenes (mPE) were evaluated and correlated to the LCB density. …