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Effects of nano graphene oxide as support on the product properties and performance of Ziegler–Natta catalyst in production of UHMWPE
Author(s) -
Kheradmand Amanj,
Ramazani S.A. Ahmad,
Khorasheh Farhad,
Baghalha Morteza,
Bahrami Hiva
Publication year - 2015
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.3453
Subject(s) - catalysis , materials science , thermogravimetric analysis , oxide , polymer , fourier transform infrared spectroscopy , dynamic mechanical analysis , graphene , polyethylene , magnesium , nuclear chemistry , chemical engineering , polymer chemistry , composite material , organic chemistry , chemistry , nanotechnology , metallurgy , engineering
The synthesis of mono‐ and bi‐supported Ziegler–Natta catalysts using magnesium etoxide Mg(OEt) 2 and graphene oxide (GO) as catalyst support for production of Ultra High Molecular Weight Polyethylene (UHMWPE) is reported in this investigation. Nano‐graphene oxide was prepared by the modified Hummer's method and its structure was analyzed by XRD and FTIR indicating the presence of hydroxyl groups on graphene oxide and the formation of an exfoliated structure. The activity of TiCl 4 /Mg(OEt) 2 , TiCl 4 /Mg(OEt) 2 ‐GO, and TiCl 4 /GO catalysts in terms of grams of PE produced per mmol of Ti per hour was experimentally obtained for catalysts with different ratios of co‐catalyst (triisobutylaluminium) to TiCl 4 . For all three series of catalysts, the activity curve showed an optimum point at a specific Al/Ti molar ratio. Catalyst activity was highest for TiCl 4 /Mg(OEt) 2 and lowest for TiCl 4 /GO. The characterization of UHMWPE products indicated that the viscosity average molecular weight (M v ) was highest for the polymer produced by TiCl 4 /Mg(OEt) 2 and lowest for the polymer produced by TiCl 4 /GO. Furthermore, thermogravimetric analysis (TGA), dynamic mechanical thermal analysis (DMTA), and mechanical tensile testing were conducted on the prepared polymers indicating that the polymer produced by TiCl 4 /GO had the highest thermal and mechanical properties, while these properties were at their minimum for polymers produced by TiCl 4 /Mg(OEt) 2 . Copyright © 2015 John Wiley & Sons, Ltd.