Fractionation and crystallization of isotactic poly(propylenes) prepared with a heterogeneous transition metal catalysts
Date
2009
Authors
Amer I.
Van Reenen A.
Journal Title
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Volume Title
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Abstract
A series of poly(propylenes) (PPs) were prepared by slurry polymerization using a MgCl2-supported transition metal catalyst. Two different external donors (EDs) were used: diphenyl dimethoxysilane (DPDMS) and methylphenyl dimethoxysilane (MPDMS). The molecular weight (MW) of the PPs was controlled using molecular hydrogen that was used as a transfer agent. To obtain materials with differing molecular weight and similar tacticities, polymers were fractionated with prep-TREF. DSC analyses of blends of TREF fractions showed that the crystallization behaviour of the polymer blends are strongly affected by the configuration (tacticity) and MW of the PP. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Description
Keywords
Crystallization behaviours, External donor, Isotactics, Molecular hydrogen, Slurry polymerization, Tacticities, Transfer agents, Transition metal catalysts, TREF, Catalysis, Catalysts, Crystallization, Hydrogen, Molecular weight, Polyethylenes, Polymers, Propylene, Transition metals, Polymer blends
Citation
Macromolecular Symposia
282
1
282
1