The heterogeneous modified-polypropene-supported Ziegler catalyst/MMAO system for producing ultrahigh molecular weight polyethene and poly(ethene-co-hex-1-ene) with a homogeneous comonomer distribution

摘要

A heterogeneous modified-polypropene-supported Ziegler catalyst (modified-PP-supported catalyst) combined with modified methylaluminoxane (MMAO) was successfully used for the production of ethene/hex-1-ene copolymers with a homogeneous distribution of hex-1-ene. The modified-PP-supported catalyst/MMAO also gave polyethene and ethene/hex-1-ene copolymers with ultrahigh molecular weight (M-bar_w>2 X 10~6). The MMAO concentration and hex-1-ene content in the feed were found to affect the activity, comonomer content in the resulting copolymer, and melting temperature, while no influence on the molecular weight and comonomer distribution was detected.