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Flavone complexes of Ti and Zr active in ethylene polymerization

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Flavone complexes of Ti and Zr active in ethylene polymerization

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Título Flavone complexes of Ti and Zr active in ethylene polymerization
Autor Gheno, Grasiela
Basso, Nara Regina de Souza
Ceschi, Marco Antonio
Livotto, Paolo Roberto
Nascimento, Alanjone Azevedo
Rocha, Zênis Novais da
Galland, Griselda Ligia Barrera
Abstract Two new complexes of Ti and Zr were synthesized with 3-hydroxyflavone bidentate ligand and investi-gated in homogeneous ethylene polymerization. Both complexes were characterized by UV–VIS,1H and13C NMR, and electrochemical studies. The geometries and energies of all possible isomeric species werestudied by full unconstrained optimizations performed at Density Functional Theory (DFT) level. Thepolymerization reactions were performed at different experimental conditions with methylaluminox-ane (MAO), as the cocatalyst. Both complexes were active in ethylene polymerization in all the conditionsused. However, zirconium complex showed the best activity comparing to the titanium complex at 2500Al/M ratio. The polymers obtained were high density polyethylene with ultra high molecular weights.
Contido em Applied Catalysis A: general. Amsterdam. Vol. 467, no. 2 (Oct. 2013), p. 439-449
Assunto Polietileno
Polimerizacao
Polímeros
[en] 3-Hydroxyflavone
[en] Catalyst
[en] Complex
[en] Polyethylene
[en] Synthesis
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/83600
Arquivos Descrição Formato
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