Exploring ortho ‐(4,4′‐dimethoxybenzhydryl) substitution in iron ethylene polymerization catalysts: Co‐catalyst effects, thermal stability, and polymer molecular weight variations

2021 ◽  
Author(s):  
Tian Liu ◽  
Yanping Ma ◽  
Gregory Solan ◽  
Tongling Liang ◽  
Wen‐Hua Sun
Keyword(s):  
Thermal Stability ◽  
Molecular Weight ◽  
Ethylene Polymerization ◽  
Polymer Molecular Weight ◽  
Polymerization Catalysts ◽  
Co Catalyst

Bis-cycloheptyl-fused bis(imino)pyridine-cobalt catalysts for PE wax formation: positive effects of fluoride substitution on catalytic performance and thermal stability

2020 ◽  
Vol 49 (27) ◽  
pp. 9425-9437 ◽  
Author(s):  
Qiuyue Zhang ◽  
Ningning Wu ◽  
Junfeng Xiang ◽  
Gregory A. Solan ◽  
Hongyi Suo ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Molecular Weight ◽  
Ethylene Polymerization ◽  
Catalytic Performance ◽  
Cobalt Catalysts ◽  
Low Molecular Weight ◽  
Polymerization Catalysts ◽  
Positive Effects

The depicted ethylene polymerization catalysts exhibited optimal activities at 60 °C forming low molecular weight PE waxes; ortho-F substitution proved beneficial.

scholarly journals Chromium ethylene polymerization catalysts bearing sterically enhanced α,α′-bis(imino)-2,3:5,6-bis(pentamethylene)pyridines: Tuning activity and molecular weight

Polymer ◽  
2019 ◽  
Vol 171 ◽  
pp. 87-95 ◽  
Author(s):  
Chantsalnyam Bariashir ◽  
Zheng Wang ◽  
Gregory A. Solan ◽  
Chuanbing Huang ◽  
Xiang Hao ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ethylene Polymerization ◽  
Polymerization Catalysts

scholarly journals Enhancing thermostability of iron ethylene polymerization catalysts through N,N,N-chelation of doubly fused α,α′-bis(arylimino)-2,3:5,6-bis(hexamethylene)pyridines

2019 ◽  
Vol 9 (8) ◽  
pp. 1933-1943 ◽  
Author(s):  
Zheng Wang ◽  
Randi Zhang ◽  
Wenjuan Zhang ◽  
Gregory A. Solan ◽  
Qingbin Liu ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Catalytic Activity ◽  
High Molecular Weight ◽  
Ethylene Polymerization ◽  
High Catalytic Activity ◽  
Polymerization Catalysts ◽  
Fe Catalyst

At temperatures up to 80 °C, high catalytic activity and high molecular weight PE was achievable using the Fe-catalyst depicted.

scholarly journals From polyethylene waxes to HDPE using an α,α′-bis(arylimino)-2,3:5,6-bis(pentamethylene)pyridyl-chromium(iii) chloride pre-catalyst in ethylene polymerisation

2017 ◽  
Vol 46 (21) ◽  
pp. 6948-6957 ◽  
Author(s):  
Chuanbing Huang ◽  
Shizhen Du ◽  
Gregory A. Solan ◽  
Yang Sun ◽  
Wen-Hua Sun
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Ethylene Polymerization ◽  
Co Catalyst ◽  
Catalytic Activities ◽  
Ethylene Polymerisation

Depending on the aluminium-alkyl co-catalyst employed, the title Cr(iii) chlorides can exhibit high catalytic activities in ethylene polymerization, producing either high molecular weight PE or linear PE waxes.

Titanium pyridyl-phosphinimide complexes — Synthesis, structure, and ethylene polymerization catalysis

2006 ◽  
Vol 84 (5) ◽  
pp. 755-761 ◽  
Author(s):  
Chad Beddie ◽  
Pingrong Wei ◽  
Douglas W Stephan
Keyword(s):  
Molecular Weight ◽  
Key Words ◽  
Ethylene Polymerization ◽  
Olefin Polymerization ◽  
Polymerization Catalysts ◽  
Pyridyl Group ◽  
Molecular Weight Distributions ◽  
Polymerization Catalysis ◽  
Weight Distributions

A series of Ti–pyridyl-phosphinimide complexes of the form Cp′TiX2[NPR2(2-CH2Py)] (Cp′ = Cp, Cp*, R = i-Pr, t-Bu, X = Cl, Me) have been prepared and characterized. These complexes generate ethylene polymerization catalysts upon activation with MAO or B(C6F5)3. The resulting polymers exhibit broad molecular weight distributions. The role of the pyridyl group is discussed in light of stoichiometric reactions of CpTiCl2[NPR2(2-CH2Py)] with B(C6F5)3.Key words: phosphinimide complexes, pyridyl-phosphinimides, olefin polymerization.

Thermally resilient cobalt ethylene polymerization catalysts under the joint influence of co-catalyst, gem-dimethyl substitution and ortho-cycloalkyl ring size

Polymer ◽  
2021 ◽  
Vol 222 ◽  
pp. 123684
Author(s):  
Randi Zhang ◽  
Yongfeng Huang ◽  
Yanping Ma ◽  
Gregory A. Solan ◽  
Xinquan Hu ◽  
...  
Keyword(s):  
Ethylene Polymerization ◽  
Ring Size ◽  
Polymerization Catalysts ◽  
Co Catalyst ◽  
Joint Influence

Synthesis of long chain aliphatic ester and its titanium complexes for ethylene polymerization

e-Polymers ◽  
2012 ◽  
Vol 12 (1) ◽  
Author(s):  
Umesh Makwana ◽  
Bhavesh K. Desai ◽  
Hiren M. Bhajiwala ◽  
Gurmeet Singh ◽  
Rajendra B. Patankar ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Nmr Spectroscopy ◽  
Energy Efficient ◽  
Ethylene Polymerization ◽  
Titanium Tetrachloride ◽  
Thermal Characteristics ◽  
Isopropyl Myristate ◽  
Co Catalyst ◽  
Aliphatic Ester ◽  
Long Chain

AbstractLong chain aliphatic ester, isopropyl myristate, was synthesized using energy efficient microwave irradiation technique. The iso propyl myristate forms complexes with titanium tetrachloride in different mole ratios. The nature of chemical bonding between the titanium and the ester functionality was investigated by FTIR and NMR spectroscopy. The performance of synthesized complexes with methylalumoxane as co-catalyst for ethylene polymerization was found to depend on the nature of complex and polymerization parameters. Molecular weight and thermal characteristics of polyethylene was also investigated.

Altering molecular weight distributions: Benzyl–phosphinimide titanium complexes as ethylene polymerization catalysts

2004 ◽  
Vol 82 (8) ◽  
pp. 1304-1313 ◽  
Author(s):  
Emily Hollink ◽  
Pingrong Wei ◽  
Douglas W Stephan
Keyword(s):  
Molecular Weight ◽  
Ethylene Polymerization ◽  
Active Species ◽  
Polymerization Catalysts ◽  
Subsequent Reaction ◽  
X Ray ◽  
Molecular Weight Distributions ◽  
Polymerization Catalysis ◽  
Weight Distributions ◽  
High Yields

The phosphines and corresponding phosphinimines R2BnPNSiMe3 (R = t-Bu, Cy), p-C6H4(CH2PR2)2 (R = t-Bu (1), Cy (2)), and p-C6H4(CH2PR2NSiMe3)2 (R = t-Bu (3), Cy (4)) were prepared in high yields. Subsequent reaction with Ti precursors afforded (R2BnPN)TiCp*Cl2 (Cp* = η-C5Me5; R = t-Bu (5), Cy (6)), (R2BnPN)TiCpCl2 (Cp = η-C5H5; R = t-Bu (7), Cy (8)), p-C6H4(CH2PR2NTiCp*Cl2)2 (R = t-Bu (9), Cy (10)), and p-C6H4(CH2PR2NTiCpCl2)2 (R = t-Bu (11), Cy (12)). Methylation of the above complexes gave (R2BnPN)TiCp*Me2 (R = t-Bu (13), Cy (14)), (R2BnPN)TiCpMe2 (R = t-Bu (15), Cy (16)), p-C6H4(CH2PR2NTiCp*Me2)2 (R = t-Bu (17), Cy (18)), and p-C6H4(CH2PR2NTiCpMe2)2 (R = t-Bu (19), Cy (20)). The activity of these species as catalyst precursors in ethylene polymerization catalysis was evaluated using Schlenk line and Buchi reactor techniques using activation by methylaluminoxane (MAO) or [Ph3C][B(C6F5)4]. All these catalysts showed good activities and yield polymers with relatively broad molecular weight distributions. The bimodal polymers derived from catalysts generated using MAO are proposed to result from additional active species, possibly as a result of reaction of MAO with the benzylic fragments. X-ray data are reported for 1, 4–8, 10, 12–14, 16, and 18–20.Key words: phosphinimides, polymerization, catalysis, polyethylene, titanium, polymer molecular weight distributions.

Titanium amidate complexes as active catalysts for the synthesis of high molecular weight polyethylene

2015 ◽  
Vol 93 (7) ◽  
pp. 775-783 ◽  
Author(s):  
Patricia Horrillo-Martinez ◽  
David C. Leitch ◽  
Scott A. Ryken ◽  
Robert K. Thomson ◽  
J. David Beard ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Ethylene Polymerization ◽  
Catalytic Polymerization ◽  
Binding Motifs ◽  
Co Catalyst ◽  
Multiple Binding ◽  
Polymeric Chains ◽  
Ultra High Molecular Weight

A series of titanium and zirconium bis(amidate) complexes of the type L2MX2, where L is an amidate ligand, and X is either –NMe2 or –Cl, were prepared in 60%–83% yield and fully characterized. Multiple binding motifs are observed as the amidate ligand can bind in κ1- and κ2-modes. These complexes were then subjected to screening the catalytic polymerization of ethylene. All catalysts, after reaction with suitable co-catalyst, were functional for ethylene polymerization, though not for the copolymerization of ethylene and longer linear 1-alkenes. Polyethylene was formed in the range of 1000–4000 kDa, and with PDI values as low as 1.3. These long polymeric chains are considered as ultra-high molecular weight polyethylene (UHMWPE).

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