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Synthesis and Characterization of Long‐Chain‐Branched Polyolefins with Metallocene Catalysts: Copolymerization of Ethylene with Poly(ethylene‐ co ‐propylene) Macromonomer
Author(s) -
Kolodka Edward,
Wang WenJun,
Zhu Shiping,
Hamielec Archie
Publication year - 2003
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200390047
Subject(s) - macromonomer , ethylene , branching (polymer chemistry) , polymer chemistry , copolymer , catalysis , metallocene , polymer , materials science , chemistry , organic chemistry , polymerization
Poly(ethylene‐ co ‐propylene) macromonomer (EPM) was synthesized in a high‐temperature continuous stirred tank reactor (CSTR) with [C 5 Me 4 (SiMe 2 N t Bu)]TiMe 2 (CGC‐Ti) as the catalyst system. PE samples with EPM long chain branching (LCB) were produced by semi‐batch copolymerization of ethylene and EPM with CGC‐Ti. The LCB frequencies were up to 21.8 EPM side chains per PE backbone. The effects of temperature and ethylene pressure on the degree of EPM grafting and catalyst activity were examined.Incorporation of EPM into a growing PE chain forming an LCB polymer.