DETERMINAITON OF COMONOMER DISTRIBUTION IN ETHYLENE/a-OLEFIN COPOLYMERS

摘要

Estimation of chemical composition distribution in ethylene/α-olefin copolymers using crystallization techniques is studied in this paper. Monte Carlo simulation was used to model the fractionation process in crystallization analysis fractionation (CRYSTAF). Five polyethylene/1-octene) samples synthesized with a single-site-type catalyst were used to verify the simulation results. It was proposed that the fractionation mechanism be controlled by the crystallization of the longest ethylene sequence in each chain. Good agreement between experimental and simulation results verified the validity of the proposed fractionation mechanism.