scholarly journals Substituent Effects on Silicon of Bridged Tetramethylcyclopentadienyl−Phenoxy Titanium Complexes for Controlling the Regiochemistry and Molecular Weight in 1-Olefin Polymerization

2010 ◽  
Vol 43 (11) ◽  
pp. 5162-5162
Author(s):  
Taichi Senda ◽  
Hidenori Hanaoka ◽  
Takahiro Hino ◽  
Yoshiaki Oda ◽  
Hayato Tsurugi ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Olefin Polymerization ◽  
Substituent Effects ◽  
Titanium Complexes

Substituent Effects on Silicon of Bridged Tetramethylcyclopentadienyl−Phenoxy Titanium Complexes for Controlling the Regiochemistry and Molecular Weight in 1-Olefin Polymerization

2009 ◽  
Vol 42 (21) ◽  
pp. 8006-8009 ◽  
Author(s):  
Taichi Senda ◽  
Hidenori Hanaoka ◽  
Takahiro Hino ◽  
Yoshiaki Oda ◽  
Hayato Tsurugi ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Olefin Polymerization ◽  
Substituent Effects ◽  
Titanium Complexes

Sterically expanded CGC catalysts: substituent effects on ethylene and α-olefin polymerization

2013 ◽  
Vol 42 (25) ◽  
pp. 9139 ◽  
Author(s):  
Jianfang Chai ◽  
Khalil A. Abboud ◽  
Stephen A. Miller
Keyword(s):  
Olefin Polymerization ◽  
Substituent Effects

scholarly journals Methylene-Bridged Tridentate Salicylaldiminato Binuclear Titanium Complexes as Copolymerization Catalysts for the Preparation of LLDPE through [Fe]/[Ti] Tandem Catalysis

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1114 ◽  
Author(s):  
Yani Luo ◽  
Jian Li ◽  
Derong Luo ◽  
Qingliang You ◽  
Zifeng Yang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Temperature ◽  
Gel Permeation Chromatography ◽  
13C Nmr Spectroscopy ◽  
Molar Ratio ◽  
Tandem Catalysis ◽  
Titanium Complexes ◽  
Scanning Calorimetry ◽  
Molecular Weights ◽  
Branching Degree

A novel tandem catalysis system consisted of salicylaldiminato binuclear/mononuclear titanium and 2,6-bis(imino)pyridyl iron complexes was developed to catalyze ethylene in-situ copolymerization. Linear low-density polyethylene (LLDPE) with varying molecular weight and branching degree was successfully prepared with ethylene as the sole monomer feed. The polymerization conditions, including the reaction temperature, the Fi/Ti molar ratio, and the structures of bi- or mononuclear Ti complexes were found to greatly influence the catalytic performances and the properties of obtained polymers. The polymers were characterized by differential scanning calorimetry (DSC), high temperature gel permeation chromatography (GPC) and high temperature 13C NMR spectroscopy, and found to contain ethyl, butyl, as well as some longer branches. The binuclear titanium complexes demonstrated excellent catalytic activity (up to 8.95 × 106 g/molTi·h·atm) and showed a strong positive comonomer effect when combined with the bisiminopyridyl Fe complex. The branching degree can be tuned from 2.53 to 22.89/1000C by changing the reaction conditions or using different copolymerization pre-catalysts. The melting points, crystallinity and molecular weights of the products can also be modified accordingly. The binuclear complex Ti2L1 with methylthio sidearm showed higher capability for comonomer incorporation and produced polymers with higher branching degree and much higher molecular weight compared with the mononuclear analogue.

Titanium Complexes Bearing a Hemilabile Heteroscorpionate Ligand:  Synthesis, Reactivity, and Olefin Polymerization Activity

2005 ◽  
Vol 24 (21) ◽  
pp. 4915-4925 ◽  
Author(s):  
Stefano Milione ◽  
Valerio Bertolasi ◽  
Tomás Cuenca ◽  
Alfonso Grassi
Keyword(s):  
Olefin Polymerization ◽  
Titanium Complexes ◽  
Ligand Synthesis

Preparation of octahydro- and tetrahydro-[1,10]phenanthroline zirconium and hafnium complexes for olefin polymerization

2015 ◽  
Vol 44 (8) ◽  
pp. 3845-3855 ◽  
Author(s):  
Eun Yeong Hwang ◽  
Geun Ho Park ◽  
Chun Sun Lee ◽  
Yi Young Kang ◽  
Junseong Lee ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Olefin Polymerization ◽  
Binding Mode ◽  
Low Molecular Weight ◽  
Zirconium Complex

A zirconium complex with an unusual binding mode was constructed from octahydro[1,10]phenanthroline, which is a potent catalyst for the production of wax-like low-molecular weight polyethylene (Mn: ∼5000).

Synthesis of Imino-Enamido Hafnium and Zirconium Complexes: A New Family of Olefin Polymerization Catalysts with Ultrahigh-Molecular-Weight Capabilities

2011 ◽  
Vol 30 (6) ◽  
pp. 1695-1709 ◽  
Author(s):  
Ruth Figueroa ◽  
Robert D. Froese ◽  
Yiyong He ◽  
Jerzy Klosin ◽  
Curt N. Theriault ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Olefin Polymerization ◽  
Polymerization Catalysts ◽  
New Family ◽  
Zirconium Complexes ◽  
Ultrahigh Molecular Weight

Asymmetric bis-salicylaldiminato binuclear titanium complexes for ethylene polymerization and copolymerization

2021 ◽  
Author(s):  
Yawen Qin ◽  
Tingcheng Li ◽  
Xiong Chen ◽  
Jian Li ◽  
Xiang Meng ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Ethylene Polymerization ◽  
Titanium Complexes ◽  
Broad Molecular Weight Distribution

Polyolefins with high molecular weight and broad molecular weight distribution have attracted great attention due to their ease of processing and wide applications. In this paper, methylene-bridged asymmetric disalicylaldimine ligands...

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