Effect of crystallization conditions on the morphological structure of ethylene-1-butene copolymers obtained by different ziegler-natta catalyst systems

1991 ◽  
Vol 31 (16) ◽  
pp. 1189-1193 ◽  
Author(s):  
E. Pérez ◽  
R. Benavente ◽  
A. Bello ◽  
J. M. Pereña ◽  
C. Aguilar ◽  
...  
Keyword(s):  
Morphological Structure ◽  
Natta Catalyst ◽  
Crystallization Conditions ◽  
Catalyst Systems ◽  
Ziegler Natta Catalyst

The nature of the active centres in Ziegler-Natta catalyst systems

1975 ◽  
Vol 17 (2) ◽  
pp. 355-365 ◽  
Author(s):  
O.A Ponomarev ◽  
K.S Minsher ◽  
V.M Pshenichnirov ◽  
Yu.A Sangalov
Keyword(s):  
Natta Catalyst ◽  
Catalyst Systems ◽  
Active Centres ◽  
Ziegler Natta Catalyst

Generation of Homogeneous (sp3-C1)-Bridged Cp/Amido and Cp/Phosphido Group 4 Metal Ziegler−Natta Catalyst Systems

2001 ◽  
Vol 123 (25) ◽  
pp. 6181-6182 ◽  
Author(s):  
Klaus Kunz ◽  
Gerhard Erker ◽  
Steve Döring ◽  
Roland Fröhlich ◽  
Gerald Kehr
Keyword(s):  
Group 4 ◽  
Natta Catalyst ◽  
Catalyst Systems ◽  
Group 4 Metal ◽  
Ziegler Natta Catalyst

Effect of alkylaluminum structure on Ziegler-Natta catalyst systems based on neodymium for producing high-cis polybutadiene

2008 ◽  
Vol 62 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Tereza C. J. Rocha ◽  
Fernanda M. B. Coutinho ◽  
Bluma G. Soares
Keyword(s):  
Natta Catalyst ◽  
Catalyst Systems ◽  
Ziegler Natta Catalyst

Polymerization of some terminal alkynes by Ziegler–Natta catalyst systems: Fe(RCOO)3–AlEt3

1999 ◽  
Vol 35 (5) ◽  
pp. 953-963 ◽  
Author(s):  
Alain Petit ◽  
Saad Moulay ◽  
Taı̈eb Aouak
Keyword(s):  
Terminal Alkynes ◽  
Natta Catalyst ◽  
Catalyst Systems ◽  
Ziegler Natta Catalyst

scholarly journals ESR Studies on Ziegler-Natta Catalyst Systems

1970 ◽  
Vol 73 (2) ◽  
pp. 276-279 ◽  
Author(s):  
Ichiro OKURA ◽  
Yoko SENDODA ◽  
Tominaga KEII
Keyword(s):  
Natta Catalyst ◽  
Catalyst Systems ◽  
Ziegler Natta Catalyst

Low Cis Polymerization of Butadiene Using TiCl4 and Bisupported with SiO2/MgCl2(Ethoxide Type)/TiCl4 Catalysts

2004 ◽  
Vol 77 (4) ◽  
pp. 736-744
Author(s):  
G. H. Zohuri ◽  
R. Mohebat ◽  
R. Jam Jah ◽  
S. Ahmadjo
Keyword(s):  
Chain Transfer ◽  
Molar Ratio ◽  
Polymerization Temperature ◽  
Gel Content ◽  
Natta Catalyst ◽  
Heterogenous Catalyst ◽  
Catalyst Systems ◽  
A Chain ◽  
Polymerization Conditions ◽  
Ziegler Natta Catalyst

Abstract To obtain low cis polymer of butadiene (PBR), heterogenous and homogeneous Ziegler-Natta catalyst of TiCl4 were used. SiO2 and Mg(OEt)2 were used as supports for the heterogenous catalyst, while TiCl2 was used as a soluble catalyst. Triisobutylaluminium (TIBA) was used as a cocatalyst. Optimum molar ratio of Al/Ti = 1.5 : 1 and Al:Ti = 13 : 1 were obtained for TiCl4/TIBA and SiO2/MgCl2 (ethoxide type)/TiCl4/TIBA catalyst systems, respectively, regarding productivity of the catalysts. Effect of the temperature of 25–65 °C on polymerization was studied for the bisupport one; while for the TiCl4 temperature control was difficult. This could be due to the obtained high gel content of polymer. The highest yield of PBR was obtained at 55 °C using the bisupported catalyst. Addition of H2 as a chain transfer agent decreased cis%, gel content and the yield of polymer obtained. Increasing polymerization temperature when H2 was used was negligible, which had an affect on the gel content of the polymer. Productivity of the bisupported catalyst was higher than the TiCl4 catalyst itself and the polymerization temperature was under control as well. Polymer with cis content of 4 to 65% was obtained using different catalyst and different polymerization conditions.

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