Abstract
The spherical magnesium chloride (MgCl 2)-supported methylaluminoxane (MAO) pre-catalysts were prepared using MgCl 2·2.6EtOH adduct as support material subjected to elimination of EtOH by thermal treatments. The pre-catalysts were characterized by X-ray diffraction (XRD), IR, 27Al solid-state NMR, scanning electron microscopy (SEM) and N 2 BET surface areas. Under the activation of triethylaluminum (TEA), polymerization of ethylene were carried out by contacting supported MAO with soluble dichloro(rac-ethylene-bis(1-indenyl))zirconium (rac-Et(Ind) 2ZrCl 2) prior to polymerization. As a result, the polymers with spherical form morphology and high bulk density (over 0.35 g/cm 3) were obtained. The addition of cross-linking agents (CAs) during the adsorption of MAO on the support (e.g. glycol, glycerol and triethanolamine) led to an increase in Al content from 3.8 to 9–12 wt.% and in the catalyst activity. The highest activity in ethylene polymerization (3.48×10 7 g polyethylene (PE)/(mol Zr h)) was achieved in the case of using glycerol as CA.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
