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of dry toluene was added to the polymerization bottle. The
resulting solvent was then saturated with a prescribed ethylene
pressure. The co-catalyst (MAO) was then added in Al/Ni molar
ratios in the range of 600e1500 to the polymerization bottle via
a syringe. At this time, the solutions were thermostated to the
desired temperature and allowed to equilibrate for 15 min.
Subsequently, an o-dichlorobenzene solution of Ni catalyst was
added to the polymerization reactor. The polymerization, con-
ducted under a dynamic pressure of ethylene (absolute pressur-
e ¼ 1.2 bar), was terminated by quenching the reaction mixtures
with 100 ml of a 2% HCleMeOH solution. The precipitated polymer
was filtered, washed with methanol and dried under vacuum at
60 ꢀC to a constant weight.
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Acknowledgments
We thank the National Natural Science Foundation of China
(20964003) for funding. We also thank Key Laboratory of Eco-
Environment-Related Polymer Materials of Ministry of Education,
Key Laboratory of Polymer Materials of Gansu Province (Northwest
Normal University), for financial support. P.T.G. and M.M.M. thank
the Fundação para Ciência e Tecnologia for financial support
(Project PTDC/EQU-EQU/110313/2009, co-financed by FEDER).
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