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Ethene/Propene Copolymerizations from Metallocene‐Based Catalytic Systems: The Role of Comonomer Concentrations
Author(s) -
Galimberti Maurizio,
Piemontesi Fabrizio,
Baruzzi Giovanni,
Mascellani Nicoletta,
Camurati Isabella,
Fusco Ofelia
Publication year - 2001
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 - 10.1002/1521-3935(20010601)202:10<2029::aid-macp2029>3.0.co;2-q
Subject(s) - comonomer , metallocene , propene , polymer chemistry , reactivity (psychology) , ferrocene , polymerization , catalysis , chemistry , solvent , zirconium , dimethylsilane , organic chemistry , polymer , medicine , alternative medicine , electrode , pathology , electrochemistry
Ethene/propene copolymerizations were performed with rac ‐[ethylenebis(4,5,6,7‐tetrahydro‐1‐indenyl)]zirconium dichloride ( r ‐EBTHIZrCl 2 ) and tetraisooctylaluminoxane (TIOAO). Copolymerizations were carried out at three levels of comonomer concentrations, in a range from about 0.011 M to about 2.6 M . The reactivity ratios of copolymerizations ( r 11 , r 21 , r 22 and r 12 ) and the relative reactivity of the comonomers ( R ) were determined, for all the adopted experimental conditions. Tests and reported data indicate that they are substantially the same over a broad range of comonomer concentrations, thus making metallocene based catalytic systems potentially suitable for industrial application. The effect of the polymerization solvent, either aliphatic or aromatic, is also briefly discussed.