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Using alkylaluminium activators to tailor short chain branching distributions of ethylene/1-hexene copolymers produced with in-situ supported metallocene catalysts
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2000
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EngineeringOrganic ChemistryChemistryPolymersChemical EngineeringEthylene/1-hexene CopolymersAlkylaluminium ActivatorsNarrow MwdsHomogeneous CatalysisPolymer ChemistryMaterials ScienceBimodal ScbdsCatalysisShort ChainCatalytic SynthesisDifferent ScbdsDepolymerizationPolymer SciencePolymerization KineticsPolymer ReactionPolymer Synthesis
Copolymerizations of ethylene and 1-hexene were carried out with an in-situ supported metallocene catalyst. Copolymers were produced with different alkylaluminium activators and the effect on molecular weight distribution (MWD) and short chain branching distribution (SCBD) was examined. It was found that different activator types produce polymers with unimodal and narrow MWDs but with very different SCBDs. Each activator exhibits unique comonomer incorporation characteristics which can produce bimodal SCBDs with the use of a single activator. Therefore, by using individual and mixed activator systems, it is possible to control the SCBDs of the resulting copolymers while maintaining narrow MWDs.