Alkoxy Silanes as External Donors for Polypropylene Procatalyst: Study on Polymerization Performance and Effect on Resin Properties

摘要

Effect of alkoxy silane [R₁Si(OR₂)₃] on propylene polymerization was studied by systematic variation of functional groups e.g R₂ = CH₃, R1 = ‒OCH₃, ‒CH₃, ‒(CH₂)₂CH₃, ‒(CH₂)₃N(CH₃)₂, ‒(CH₂)₃N(C₂H₅)₂. Increase in bulkiness of alkyl group from ‒OCH₃ to ‒(CH₂)₃N(C₂H₅)₂ leads to decrease in productivity of catalyst with increase in MFI. Kinetics study revealed reduction of Rp₀ and increase in decay kinetic constant with increase in bulkiness of functional groups_. Morphology study by SEM of polypropylene particles illustrated that resin particle shape (particle circularity, topography and flowability) have been comparative. Polypropylene particle size distribution study revealed shift toward higher particles size regime for bulkier groups.