Premium
Synthesis and catalytic behavior in ethene polymerization of half‐sandwich amido complexes activated with MAO
Author(s) -
Chirinos Juan,
Rajmankina Tamara,
Morillo Angel,
Ibarra Darmenia,
Parada Alvaro,
Arevalo José
Publication year - 2002
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(200207)203:10/11<1501::aid-macp1501>3.0.co;2-o
Subject(s) - methylaluminoxane , polymerization , cyclopentadienyl complex , polymer chemistry , catalysis , steric effects , sandwich compound , chemistry , polymer , molar mass , molar mass distribution , metallocene , materials science , organic chemistry , x ray crystallography , physics , diffraction , optics
The half‐sandwich complexes, [ η 1 : η 5 ‐C 9 H 6 (CH 2 ) 2 NEt]Ti(NEt 2 ) 2 and [ η 1 : η 5 ‐C 13 H 8 (CH 2 ) 2 NEt]Ti(NEt 2 ) 2 , were synthesized and characterized by spectroscopy techniques. These compounds were activated by methylaluminoxane (MAO) for homogeneous ethene polymerization. The effect of the ligand and Al/Ti molar ratio on the polymerization activity, the molecular masses and the thermal properties of the polymers were studied and compared with previous data obtained for the case of analogous cyclopentadienyl (Cp) complexes. The activity and molecular weight decreases in the following order: Cp‐half‐sandwich > indenyl‐half‐sandwich > fluorenyl‐half‐sandwich, as consequence of the interaction of steric and electronic effects.Catalytic activity for the polymerization of ethene with 3 /MAO and 4 /MAO as the function of the Al/Ti molar ratio.