Title : ( Synthesis of Stereoblock Elastomeric Poly(propylene)s Using a (2-PhInd)2ZrCl2 Metallocene Catalyst in the Presence of Co-Catalyst Mixtures: Study of Activity and Molecular Weight )
Authors: Gholam-reza Nejabat , M. Nekoomanesh , H. Arabi , Hamid Salehi-Mobarakeh , Gholamhossein Zohuri , Mojtaba Omidvar , Stephen A. Miller ,
Full TextAbstract
The effect of adding various aluminumalkyls (R¼Et, i-Bu) on the polymerization of propylene is studied using a (2-PhInd)2ZrCl2 pre-catalyst. A mild deactivating effect is found upon addition of TIBA, whereas TEA shows a sharp deactivating effect. Increasing amounts of AlR3 results in a significant activity increase for TIBA, but an activity plateau for TEA. AlR3 imposes remarkably different effects on the molecular weight and stereochemical microstructure of polymers. As the TIBA concentration increases, Mv increases at first, growing from 49 000 to 72 000, but subsequently drops to 40 000. For TEA, Mv decreases sharply, plummeting from 49 000 to 17 000. Both TIBA and TEA increase the mmmm pentad content from 7.9 to 23.5% and 17.6%, respectively.
Keywords
, (2-PhInd)2ZrCl2, Co-Catalyst Mixtures, elastomeric poly(propylene), microstructure
@article{paperid:1032424,
author = {Gholam-reza Nejabat and M. Nekoomanesh and H. Arabi and Hamid Salehi-Mobarakeh and Zohuri, Gholamhossein and Mojtaba Omidvar and Stephen A. Miller},
title = {Synthesis of Stereoblock Elastomeric Poly(propylene)s Using a (2-PhInd)2ZrCl2 Metallocene Catalyst in the Presence of Co-Catalyst Mixtures: Study of Activity and Molecular Weight},
journal = {Macromolecular Reaction Engineering},
year = {2012},
volume = {6},
number = {6},
month = {June},
issn = {1862-832x},
pages = {523--529},
numpages = {6},
keywords = {(2-PhInd)2ZrCl2; Co-Catalyst Mixtures; elastomeric poly(propylene); microstructure},
}
%0 Journal Article
%T Synthesis of Stereoblock Elastomeric Poly(propylene)s Using a (2-PhInd)2ZrCl2 Metallocene Catalyst in the Presence of Co-Catalyst Mixtures: Study of Activity and Molecular Weight
%A Gholam-reza Nejabat
%A M. Nekoomanesh
%A H. Arabi
%A Hamid Salehi-Mobarakeh
%A Zohuri, Gholamhossein
%A Mojtaba Omidvar
%A Stephen A. Miller
%J Macromolecular Reaction Engineering
%@ 1862-832x
%D 2012
