Synthesis and characterization of long-chain-branched polyolefins with metallocene catalysts: copolymerization of ethylene with poly(ethylene-co-propylene) macromonomer

摘要

Poly(ethylene-co-propylene) macromonomer (EPM) was synthesized in a high-temperature continuous stirred tank reactor (CSTR) with C5Me4(Si-(Me2NBu)-Bu-t)TiMe2 (CGC-Ti) as the catalyst system. PE samples with EPM long chain branching (LCB) were produced by semi-batch copolymerization of ethylene and EPM with CGC-Ti. The LCB frequencies were up to 21.8 EPM side chains per PE backbone. The effects of temperature and ethylene pressure on the degree of EPM grafting and catalyst activity were examined. References: 14