Premium
Direct Copolymerization of Propene and Ethene‐based Macromers to Produce Long Chain Branched Syndiotactic Polypropene
Author(s) -
Rulhoff S.,
Kaminsky W.
Publication year - 2006
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.200690051
Subject(s) - tacticity , propene , copolymer , polymer chemistry , metallocene , polymerization , materials science , alkoxy group , catalysis , polypropylene , xylene , chemistry , organic chemistry , polymer , toluene , alkyl
Copolymers of propene and ethene‐based macromers have been prepared in a direct copolymerization. First macromers in a range of 3000–11600 g/mol were synthesized by varying the polymerization temperature and ethene concentration with the metallocene catalyst [(CH 3 ) 2 CCp 2 ]ZrCl 2 /MAO. These vinyl terminated ethene oligomers were copolymerized with propene by C s symmetric catalyst [Ph 2 C(Cp)(Flu)]ZrCl 2 to a long‐chain branched syndiotactic polypropylene. The LCB‐sPP was separated from the bimodal product by a fractional crystallization with p‐xylene and 2 ‐ ethoxy ethanol at 130 °C. A detailed analysis of the purified copolymer was given by GPC, DSC and 13 C NMR spectroscopy.