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Fractionation and Crystallization of Isotactic Poly(propylenes) Prepared with a Heterogeneous Transition Metal Catalysts
Author(s) -
Amer Ismael,
van Reenen Albert
Publication year - 2009
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200950804
Subject(s) - tacticity , crystallization , polymer , glass transition , materials science , polymer chemistry , catalysis , chemical engineering , fractionation , slurry , polymerization , transition metal , chemistry , organic chemistry , composite material , engineering
Summary: A series of poly(propylenes) (PPs) were prepared by slurry polymerization using a MgCl 2 ‐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.