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Characterization of MAO‐Modified Silicas for Ethylene Polymerization
Author(s) -
Mortazavi Mohamad Mehdi,
Ahmadjo Saeid,
Santos Joao Henrique Zimnoch Dos,
Arabi Hassan,
Nekoomanesh Mehdi,
Zohuri Gholam Hossein,
Brambilla Rodrigo,
Galland Griselda Barrera
Publication year - 2013
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.39737
Subject(s) - methylaluminoxane , materials science , fourier transform infrared spectroscopy , polymerization , scanning electron microscope , thermogravimetric analysis , small angle x ray scattering , polymer chemistry , ethylene , calcination , gravimetric analysis , monomer , chemical engineering , nuclear chemistry , catalysis , scattering , chemistry , organic chemistry , composite material , polymer , metallocene , engineering , physics , optics
A series of methylaluminoxane (MAO)‐modified PQ and EP 12 silicas, calcined at 110, 250, and 450°C, were prepared. The resulting MAO‐modified supports were characterized by a set of complementary techniques: Fourier transform infrared spectroscopy (FT‐IR), scanning electron microscopy‐energy dispersive X‐ray spectroscopy (SEM‐EDX), small angle X‐ray scattering (SAXS), and thermal gravimetric analysis (TGA). The Al/Si ratios of the MAO‐modified PQ and EP12 silicas were in the ranges of 0.19–0.27 wt % and 0.17–0.30 wt %, respectively. MAO‐modified silicas were used in the polymerization of ethylene using an Et 2 IndZrCl 2 catalyst. The MAO‐modified PQ silica showed higher activity in comparison to the MAO‐modified EP12. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 4568–4575, 2013