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Ultrahigh‐Molecular‐Weight Polyethylene by Using a Titanium Calix[4]arene Complex with High Thermal Stability under Polymerization Conditions
Author(s) -
Frediani Marco,
Sémeril David,
Comucci Alessandro,
Bettucci Lorenzo,
Frediani Piero,
Rosi Luca,
Matt Dominique,
Toupet Loïc,
Kaminsky Walter
Publication year - 2007
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200700075
Subject(s) - polyethylene , polymerization , catalysis , polymer chemistry , thermal stability , titanium , chemistry , natta , ethylene , coordination polymerization , kinetics , materials science , solution polymerization , organic chemistry , polymer , physics , quantum mechanics
The new complex 25,27‐dipropyloxy‐26,28‐dioxocalix[4]arene titanium (IV) dichloride ( 1 ) was evaluated as an ethylene polymerization catalyst. Activation with methylalumoxane resulted in an active system producing ultrahigh‐molecular‐weight polyethylene. As expected for a Ziegler‐Natta catalyst, the polymerization reaction follows first‐order kinetics. The most striking feature of the catalytic system ( 1 /MAO) is its remarkably high thermal stability. This peculiarity probably relies on the electronic stabilization of the metal center by the two coordinating propoxy groups.