Microstructure of isotactic polypropylene obtained using Ziegler-Natta catalyst at high polymerization temperature

2015 ◽  
Vol 132 (36) ◽  
pp. n/a-n/a
Author(s):  
Ning Tan ◽  
Luqiang Yu ◽  
Zhong Tan ◽  
Bingquan Mao
Keyword(s):  
Isotactic Polypropylene ◽  
Polymerization Temperature ◽  
Natta Catalyst ◽  
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.

Tacticity distribution of isotactic polypropylene prepared with heterogeneous Ziegler–Natta catalyst. 1. Fractionation of polypropylene

Polymer ◽  
2004 ◽  
Vol 45 (9) ◽  
pp. 3091-3098 ◽  
Author(s):  
Ville Virkkunen ◽  
Pasi Laari ◽  
Päivi Pitkänen ◽  
Franciska Sundholm
Keyword(s):  
Isotactic Polypropylene ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

DNP-SENS Formulation Protocols To Study Surface Sites in Ziegler–Natta Catalyst MgCl2 Supports Modified with Internal Donors

2021 ◽  
Author(s):  
Alexander Yakimov ◽  
Jun Xu ◽  
Keith Searles ◽  
Wei-Chih Liao ◽  
Giuseppe Antinucci ◽  
...  
Keyword(s):  
Surface Sites ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Mechanical properties of isotactic 1-butene-ethylene copolymers from Ziegler-Natta catalyst

Polymer ◽  
2021 ◽  
Vol 216 ◽  
pp. 123408
Author(s):  
Odda Ruiz de Ballesteros ◽  
Finizia Auriemma ◽  
Rocco Di Girolamo ◽  
Anna Malafronte ◽  
Miriam Scoti ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ethylene Copolymers ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Insight into structural distribution of heterogeneous Ziegler–Natta catalyst from non-empirical structure determination

2020 ◽  
Author(s):  
Gentoku Takasao ◽  
Toru Wada ◽  
Ashutosh Thakur ◽  
Patchanee Chammingkwan ◽  
Minoru Terano ◽  
...  
Keyword(s):  
Structure Determination ◽  
Structural Distribution ◽  
Natta Catalyst ◽  
Insight Into ◽  
Ziegler Natta Catalyst
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