Substituent Effects on Propylene Polymerization in Cyclic Bis(phenoxyaldimine) Titanium Catalysts

2020 ◽  
Vol 53 (24) ◽  
pp. 10803-10812
Author(s):  
Xiangxiang Zhao ◽  
Hao Li ◽  
Yiming Liu ◽  
Yuguo Ma
Keyword(s):  
Substituent Effects ◽  
Propylene Polymerization ◽  
Titanium Catalysts

Influence of Internal Donors on the Performance and Structure of MgCl2 Supported Titanium Catalysts for Propylene Polymerization

2008 ◽  
Vol 210 (1) ◽  
pp. 69-76 ◽  
Author(s):  
Gurmeet Singh ◽  
Sukhdeep Kaur ◽  
Umesh Makwana ◽  
Rajendra B. Patankar ◽  
Virendra K. Gupta
Keyword(s):  
Propylene Polymerization ◽  
Titanium Catalysts

scholarly journals Substituent Effects of Phenyl Group on Silylene Bridge in Stereospecific Polymerization of Propylene with C1-Symmetric Ansa-Silylene(fluorenyl)(amido) Dimethyl Titanium Complexes

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1075 ◽  
Author(s):  
Huajin Wang ◽  
Yanqing Li ◽  
Zhengguo Cai
Keyword(s):  
Substituent Effects ◽  
Phenyl Group ◽  
Propylene Polymerization ◽  
Element Analysis ◽  
Type Method ◽  
Titanium Complex ◽  
X Ray ◽  
Batch Type ◽  
Constrained Geometry ◽  
Stereospecific Polymerization

A C1-symmetric (methylphenyl)silylene-bridged (fluorenyl)(naphthylamido) titanium complex (1) and (diphenyl)silylene-bridged (fluorenyl)(naphthylamido) titanium complex (2) were synthesized and characterized by 1H NMR, element analysis, and X-ray crystal analysis. The coordination mode of the fluorenyl ligand to the titanium metal is an η3 manner in each complex. These complexes were applied for propylene polymerization using dried modified methyaluminoxane (dMMAO) as a cocatalyst under different propylene pressures in a semi batch-type method. The catalytic activity was strongly dependent on the structure of the complex and the propylene pressure, where complex 1 exhibited the highest activity (600 kg mol−1·h−1) under a propylene pressure of 8.0 atm to produce high molecular weight polypropylene. The polypropylenes obtained were syndiotactic-rich with an rr value of 0.50, indicating that the silylene bridge was not efficient for the isospecificity of a constrained geometry catalyst (CGC). The mechanical properties of the resulting polymers depended on their microstructure.

Propylene polymerization catalyzed by novel supported titanium catalysts MgCl2/NaCl/DNBP/TiCl4 with different NaCl content

2005 ◽  
Vol 235 (1-2) ◽  
pp. 209-219 ◽  
Author(s):  
Xue Jiang ◽  
Yong-ping Chen ◽  
Zhi-qiang Fan ◽  
Qi Wang ◽  
Zhi-sheng Fu ◽  
...  
Keyword(s):  
Propylene Polymerization ◽  
Titanium Catalysts

Substituent effects and solvents

1992 ◽  
Vol 89 ◽  
pp. 1567-1571
Author(s):  
O Pytela ◽  
M Ludwig
Keyword(s):  
Substituent Effects

Modification of Si/Mg Composite Supported Ziegler- Natta Ti-based Catalysts for Propylene Polymerization Using the Third Metal Elements

2019 ◽  
Vol 35 (3) ◽  
pp. 265-279
Author(s):  
WEI ZHU ◽  
◽  
ZHOU TIAN ◽  
PINGKAI JIANG ◽  
BOPING LIU ◽  
...  
Keyword(s):  
Propylene Polymerization ◽  
Metal Elements ◽  
The Third
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