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Development of a refined poly(propylene) growth model for silica supported metallocene catalyst systems
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2000
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Chemical KineticsEngineeringGrowth ModelChemistryEdx AnalysisChemical EngineeringElectron MicroscopyPolymerization ProcessPolymer ChemistryMaterials ScienceMolecular SieveCatalytic MaterialCatalyst RecyclingCatalysisPlasticityDepolymerizationPolymer ScienceCatalyst PreparationPolymerization KineticsPolymer ReactionMetallocene Catalyst SystemsPolymer Synthesis
The poly(propylene) growth process on silica supported metallocene catalysts has been examined by means of electron microscopy and kinetic investigations. It was possible to extend the polymerization process and to identify different polymerization phases with different characteristic kinetic data by lowering the reaction temperature in the slurry phase. EDX analysis of microtome sections of a polymerized model system led to the development of a refined polymer growth model. It was found that the addition of activating hydrogen reduces the initial diffusion limitations as well as a prepolymerization step with 1-octene in the bulk phase.