Polymerization of propylene using the high-activity Ziegler-Natta catalyst system SiO2/MgCl2 (ethoxide type)/TiCl4/Di-n-butyl phthalate/triethylaluminum/dimethoxy methyl cyclohexyl silane

2003 ◽  
Vol 89 (5) ◽  
pp. 1177-1181 ◽  
Author(s):  
G. H. Zohuri ◽  
F. Azimfar ◽  
R. Jamjah ◽  
S. Ahmadjo
Keyword(s):  
High Activity ◽  
Catalyst System ◽  
Natta Catalyst ◽  
Butyl Phthalate ◽  
Ziegler Natta Catalyst

Copolymerization of ethylene/propylene elastomer using high-activity Ziegler-Natta catalyst system of MgCl2 (ethoxide type)/EB/PDMS/TiCl4/PMT

2002 ◽  
Vol 84 (4) ◽  
pp. 785-790 ◽  
Author(s):  
G. H. Zohuri ◽  
F. Sadegvandi ◽  
R. JamJah ◽  
S. Ahmadjo ◽  
M. Nekoomanesh ◽  
...  
Keyword(s):  
High Activity ◽  
Catalyst System ◽  
Ethylene Propylene ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Influences of silane/ether composite external donors on propylene polymerization with MgCl2-supported Ziegler-Natta catalyst in the presence of hydrogen

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Song-tao Tu ◽  
Jun-qin Lou ◽  
Zhi-sheng Fu ◽  
Zhi-qiang Fan
Keyword(s):  
Molecular Weight ◽  
Catalytic Activity ◽  
High Activity ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Catalyst System ◽  
Propylene Polymerization ◽  
External Donor ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

AbstractIn this work, the effects of two silane type external donors, Ph2Si(OCH3)2 (DPDMS) and dicyclopentyldimethoxysilane (DCPDMS) on propylene slurry polymerization in the presence of hydrogen with a MgCl2/TiCl4/DIBP - Al(C2H5)3 catalyst system were investigated, and the tacticity distribution and molecular weight distribution (MWD) of polypropylene (PP) were further regulated by using silane/ether (ROCH3, R = n-Bu, i-C8H17) composite external donors. The tacticity distribution of PP, as revealed by successive self-nucleation and annealing (SSA) thermo analysis of the polymer, is markedly changed by the external donors. DCPDMS shows much stronger effects than DPDMS. Addition of the ether as an auxiliary external donor in MgCl2/TiCl4/DIBP-TEA/silane (DPDMS or DCPDMS) lead to further increase in catalytic activity and isotacticity of PP, and changes in tacticity distribution. By using the composite external donors, PP with both higher isotacticity index, lower molecular weight or narrower molecular weight distribution was prepared at high activity. Effects of the external donors on the active center distribution were discussed based on the results of deconvoluting the MWD curve with multiple Flory “most-probable” distributions, and possible mechanism of the external donor effects was proposed.

scholarly journals Investigation of a Ziegler–Natta catalyst system derived from a mixture of lithium tetraalkylaluminate, aluminum chloride, and titanium tetrachloride and its usefulness in polymerizations involving styrene

1981 ◽  
Vol 59 (10) ◽  
pp. 1425-1432 ◽  
Author(s):  
Anu Mishra
Keyword(s):  
Aluminum Chloride ◽  
Titanium Tetrachloride ◽  
Active Catalyst ◽  
Catalyst System ◽  
Active Components ◽  
Vinyl Ethers ◽  
Natta Catalyst ◽  
Stereospecific Polymerization ◽  
Derivatives Of ◽  
Ziegler Natta Catalyst

Vinyl ethers, 1-olefins, and styrene were homo- and copolymerized by the use of catalyst derived from a mixture of lithium tetraalkylaluminate (LiAlR4), aluminum chloride (AlCl3), and titanium tetrachloride (TiCl4), in order to determine the nature of the active components present.It is postulated that the active catalyst in the stereospecific polymerization of vinyl ethers is ether-coordinated TiCl3•LiCl, while in the polymerization of 1-olefins and styrene, it is the alkylated derivatives of TiCl3•LiCl.For homo- and copolymerization of styrene, AlR3 seems to be the preferred alkylating agent. About 3 to 4 equivalents of AlR3 are needed for complete alkylation of TiCl3•LiCl, probably due to heterogeneity of the system.Highly isotactic polystyrene and copolymers of styrene with 1-olefins can be prepared in good yields by the use of this catalyst.

Synthesizing UHMWPE Using Ziegler-Natta Catalyst System of MgCl2(ethoxide type)/ TiCl4/tri-isobutylaluminum

2008 ◽  
Vol 274 (1) ◽  
pp. 148-153 ◽  
Author(s):  
Roghieh Jamjah ◽  
Gholam Hossein Zohuri ◽  
Mohsen Javaheri ◽  
Mehdi Nekoomanesh ◽  
Saeid Ahmadjo ◽  
...  
Keyword(s):  
Catalyst System ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Polyethylene Nanocomposites Obtained fromin‐situPolymerization Using Supported Ziegler‐Natta Catalyst System

2007 ◽  
Vol 44 (1) ◽  
pp. 11-15 ◽  
Author(s):  
Fu‐An He ◽  
Li‐Ming Zhang ◽  
Fan Yang ◽  
Li‐Shan Chen ◽  
Qing Wu
Keyword(s):  
Catalyst System ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Study of propylene polymerization catalyzed by a spherical MgCl2-supported Ziegler-Natta catalyst system: The effects of external donors

2004 ◽  
Vol 95 (3) ◽  
pp. 738-742 ◽  
Author(s):  
Zhenli Ma ◽  
Li Wang ◽  
Wenqin Wang ◽  
Lianfang Feng ◽  
Xueping Gu
Keyword(s):  
Catalyst System ◽  
Propylene Polymerization ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Copolymerization of Propylene and Polar Monomers by a New Ziegler-Natta Catalyst System with Diether as Internal Donor

2010 ◽  
Vol 31 (8) ◽  
pp. 1077-1082
Author(s):  
He HUANG ◽  
Liaoyun ZHANG ◽  
Huayi LI ◽  
Youliang HU
Keyword(s):  
Catalyst System ◽  
Internal Donor ◽  
Natta Catalyst ◽  
Polar Monomers ◽  
Ziegler Natta Catalyst

scholarly journals High activity and good hydrogen response silica-supported Ziegler-Natta catalyst for ethylene polymerization

2012 ◽  
Vol 30 (4) ◽  
pp. 561-567 ◽  
Author(s):  
Tao Jiang ◽  
Li-na Zhao ◽  
Ming-jian Luo ◽  
Hong-xia Chen ◽  
Guo-liang Mao ◽  
...  
Keyword(s):  
High Activity ◽  
Ethylene Polymerization ◽  
Natta Catalyst ◽  
Hydrogen Response ◽  
Ziegler Natta Catalyst

Effect of the cocatalyst on the copolymerization of ethylene and propylene with high activity Ziegler-Natta catalyst

1992 ◽  
Vol 29 (1-2) ◽  
pp. 185-191 ◽  
Author(s):  
J. Koivum�ki ◽  
J. V. Sepp�l� ◽  
L. Kuutti
Keyword(s):  
High Activity ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst
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