Modeling and Measurement of High Pressure Ethylene Polymerization long-Chain Branching and Molecular Weight Distributions

摘要

Polyethylene samples produced by the free-radical high-pressure process exhibit bimodal molecular weight distributions (MWDs), despite being made in a well-mixed continuous tand reactor. MWD simulations provide valuable insights to the relative importance of #beta#-scission and long-chain branching in the system. The rate coefficient for branching relative to propagation is 0.01-0.03, and 2-4