Journal of Polymer Science, Part A: Polymer Chemistry, Volume (51), No (51), Year (2013-1) , Pages (724-731)

Title : ( Synthesis and Microstructurral Study of Stereoblock Elastomeric Polypropylenes from Metallocene Catalyst (2-PhInd)2ZrCl2 Activated with Cocatalyst Mixtures )

Authors: G. H. Nejabat , M. Nekoomanesh , H. Arabi , H. Salehi-Mobarakeh , Gholamhossein Zohuri , M. Omidvar , S. A. Miller ,

Citation: BibTeX | EndNote

Various elastomeric polypropylenes (PPs) are synthe- sized through homogeneous propylene polymerization with met- allocene catalyst (2-PhInd)2ZrCl2 in the presence of different cocatalyst mixtures: triethylaluminum (TEA)/methylaluminoxane (MAO) or triisobutylaluminum (TIBA)/MAO in the range of AlAlR3/ AlMAO ¼ 0.0–0.9. The cocatalyst formulation impacts the resultant polymer microstructure and the thermal and dynamic mechanical properties of the produced PPs. 13 C NMR analysis of the polymers reveals essentially atactic PP, with mmmm ¼ 7.9%, when AlAlR3/ AlMAO ¼ 0.0. The mmmm pentad content is maximized when AlAlR3/AlMAO ¼ 0.8; for TIBA, mmmm ¼ 23.5%; and for TEA, mmmm ¼ 17.6%. Differential scanning calorimetry analysis and dynamic mechanical thermal analysis corroborate these findings. Specifically, Tm, DHm,and Tg are essentially maximized under these conditions, and the minimum damping is observed for AlAlR3/AlMAO ¼ 0.6–0.8. 1 H NMR analysis of themixtures of catalyst and cocatalysts (without monomer) shows very minor differences for [Zr]:AlAlR3 in the range of 1:1–1:5.V C 2012Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51,724–731

Keywords

, catalysts, elastomers, metallocene catalysts, polyolefins, poly(propylene)
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@article{paperid:1032609,
author = {G. H. Nejabat and M. Nekoomanesh and H. Arabi and H. Salehi-Mobarakeh and Zohuri, Gholamhossein and M. Omidvar and S. A. Miller},
title = {Synthesis and Microstructurral Study of Stereoblock Elastomeric Polypropylenes from Metallocene Catalyst (2-PhInd)2ZrCl2 Activated with Cocatalyst Mixtures},
journal = {Journal of Polymer Science, Part A: Polymer Chemistry},
year = {2013},
volume = {51},
number = {51},
month = {January},
issn = {0887-624x},
pages = {724--731},
numpages = {7},
keywords = {catalysts; elastomers; metallocene catalysts; polyolefins; poly(propylene) (PP).},
}

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%0 Journal Article
%T Synthesis and Microstructurral Study of Stereoblock Elastomeric Polypropylenes from Metallocene Catalyst (2-PhInd)2ZrCl2 Activated with Cocatalyst Mixtures
%A G. H. Nejabat
%A M. Nekoomanesh
%A H. Arabi
%A H. Salehi-Mobarakeh
%A Zohuri, Gholamhossein
%A M. Omidvar
%A S. A. Miller
%J Journal of Polymer Science, Part A: Polymer Chemistry
%@ 0887-624x
%D 2013

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