Polypropylene obtained through Zeolite Supported Catalysts
Bastos, Queli C.; Marques, Maria de Fátima V.
http://dx.doi.org/10.1590/S0104-14282004000400010
Polímeros: Ciência e Tecnologia, vol.14, n4, p.251-260, 2004
Abstract
Propylene polymerizations were carried out with φ2C(Flu)(Cp)ZrCl2 and SiMe2(Ind)2ZrCl2 catalysts supported on silica, zeolite sodic mordenite (NaM) and acid mordenite (HM). The polymerizations were performed at different temperatures and varying aluminium/zirconium molar ratios ([Al]/[Zr]). The effect of these reaction parameters on the catalyst activity was investigated using a proposed statistical experimental planning. In the case of f2C(Flu)(Cp)ZrCl2, SiO2 and NaM were used as support and the catalyst performance evaluated using toluene and pentane as polymerization solvent. The molecular weight, molecular weight distribution, melting point and crystallinity of the polymers were examined. The results indicate very high activities for the syndiospecific heterogeneous system. Also, the polymers obtained had superior Mw and stereoregularity.
Keywords
Isotactic polypropylene, syndiotactic polypropylene, metallocene catalyst, supports
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