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Synthesis of Copolymers with Sterically Hindered and Polar Monomers
Author(s) -
Donner Matthias,
Fernandes Mercia,
Kaminsky Walter
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.200690055
Subject(s) - comonomer , norbornene , copolymer , polymer chemistry , polymerization , materials science , polymer , metallocene , monomer , ether , melting point , post metallocene catalyst , organic chemistry , chemistry , composite material
Different highly substituted C 1 symmetric metallocenes have been investigated for the copolymerization of ethene and norbornene. The influence of the feed ratio and the polymerization temperature were varied to characterize the polymer by means of microstructure, thermal properties and catalysts activity. The bulky structured ligands of the catalysts lead to highly stereoregular copolymers with semi‐crystalline phases even at low norbornene incorporation. Two different allyl ethers (allyl ethyl and allyl propyl ether) have been used to copolymerize with ethene using metallocene catalyst system ( rac ‐[Me 2 Si(2‐Me‐4‐(1‐Ph)Ind) 2 ]ZrCl 2 /MAO). In order to investigate the influence to ether incorporation to polymer properties, we have performed experiments varying comonomers concentration in feed, polymerization temperature and ratio Al (MAO) /Zr. The higher comonomer incorporation was followed by loss of cristallinity of the produced polymer. Additionally, the catalytic activity and melting point of the polymers also decrease with increase in comonomer concentration in feed.