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Xue M, Luo Y, Ren S, Li T, You Q, Xie G. Phenyl-bridged bis-salicylaldiminato binuclear titanium complexes for ethylene (co)polymerization. JOURNAL OF POLYMER RESEARCH 2023. [DOI: 10.1007/s10965-022-03410-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Luo Y, Li J, Luo D, You Q, Yang Z, Li T, Li X, Xie G. Methylene-Bridged Tridentate Salicylaldiminato Binuclear Titanium Complexes as Copolymerization Catalysts for the Preparation of LLDPE through [Fe]/[Ti] Tandem Catalysis. Polymers (Basel) 2019; 11:E1114. [PMID: 31266198 PMCID: PMC6681003 DOI: 10.3390/polym11071114] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 06/06/2019] [Accepted: 06/11/2019] [Indexed: 02/03/2023] Open
Abstract
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.
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Affiliation(s)
- Yani Luo
- Hubei Key Laboratory of Catalysis and Materials Science, School of Chemistry and Materials Science, South-Central University for Nationalities, Wuhan 430074, China
| | - Jian Li
- Hubei Key Laboratory of Catalysis and Materials Science, School of Chemistry and Materials Science, South-Central University for Nationalities, Wuhan 430074, China
| | - Derong Luo
- Hubei Key Laboratory of Catalysis and Materials Science, School of Chemistry and Materials Science, South-Central University for Nationalities, Wuhan 430074, China
| | - Qingliang You
- Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Chemical and Environmental Engineering, Jianghan University, Wuhan 430056, China
| | - Zifeng Yang
- Hubei Key Laboratory of Catalysis and Materials Science, School of Chemistry and Materials Science, South-Central University for Nationalities, Wuhan 430074, China
| | - Tingcheng Li
- Hubei Key Laboratory of Catalysis and Materials Science, School of Chemistry and Materials Science, South-Central University for Nationalities, Wuhan 430074, China
| | - Xiandan Li
- Hubei Key Laboratory of Catalysis and Materials Science, School of Chemistry and Materials Science, South-Central University for Nationalities, Wuhan 430074, China
| | - Guangyong Xie
- Hubei Key Laboratory of Catalysis and Materials Science, School of Chemistry and Materials Science, South-Central University for Nationalities, Wuhan 430074, China.
- Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Chemical and Environmental Engineering, Jianghan University, Wuhan 430056, China.
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Chen X, Zeng Y, Lan Z, You Q, Li T, Li X, Zhang D, Xie G. A Methylene-bridged salicylaldiminato tridentate [ONS] binuclear titanium complex for ethylene-norbornene copolymerization. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2018. [DOI: 10.1080/10601325.2018.1470467] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Xiong Chen
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan, China
| | - Yi Zeng
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan, China
| | - Zhi Lan
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan, China
| | - Qingliang You
- Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Chemical and Environmental Engineering, Jianghan University, Wuhan, China
| | - Tingcheng Li
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan, China
| | - Xiangdan Li
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan, China
| | - Daohong Zhang
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan, China
| | - Guangyong Xie
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan, China
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Luo D, Zeng Y, Chen X, Xia P, Xie G, You Q, Zhang L, Li T, Li X, Zhang A. Synthesis, characterization and olefin polymerization behaviors of phenylene-bridged bis-β-carbonylenamine binuclear titanium complexes. RSC Adv 2018; 8:6954-6964. [PMID: 35540336 PMCID: PMC9078301 DOI: 10.1039/c8ra00071a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 02/06/2018] [Indexed: 12/19/2022] Open
Abstract
Binuclear and multinuclear complexes have attracted much attention due to their unique catalytic performances for olefin polymerization compared with their mononuclear counterparts. In this work, a series of phenyl-bridged bis-β-carbonylenamine [O−NSR] (R = alkyl or phenyl) tridentate ligands and their binuclear titanium complexes (Ti2L1–Ti2L5) were synthesized and characterized by 1H NMR, 13C NMR, FTIR and elemental analysis. The molecular structure of ligand L2 (R = nPr) and its corresponding Ti complex Ti2L2 were further investigated by single-crystal X-ray diffraction, which showed that each titanium coordinated with six atoms to form a distorted octahedral configuration along with the conversion of the ligand from β-carbonylenamine to β-imino enol form. Under the activation of MMAO, these complexes catalyzed ethylene polymerization and ethylene/α-olefin copolymerization with extremely high activity (over 106 g mol (Ti)−1 h−1 atm−1) to produce high molecular weight polyethylene. At the same time, wider polydispersity as compared with the mononuclear counterpart TiL6 was observed, indicating that two active catalytic centers may be present, consistent with the asymmetrical crystal structure of the binuclear titanium complex. Furthermore, these complexes possessed better thermal stability than their mononuclear analogues. Compared with the complexes bearing alkylthio sidearms, the complex Ti2L5 bearing a phenylthio sidearm exhibited higher catalytic activity towards ethylene polymerization and produced polyethylene with much higher molecular weight, but with an appreciably lower 1-hexene incorporation ratio. Nevertheless, these bis-β-carbonylenamine-derived binuclear titanium complexes showed much higher ethylene/1-hexene copolymerization activity and 1-hexene incorporation ratios as compared with the methylene-bridged bis-salicylaldiminato binuclear titanium complexes, and the molecular weight and 1-hexene incorporation ratio could be flexibly tuned by the initial feed of α-olefin commoners and catalyst structures. Phenyl-bridged bis-β-carbonylenamine binuclear titanium complexes were synthesized, characterized and used to catalyze ethylene (co)polymerization with extremely high activity.![]()
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Affiliation(s)
- Derong Luo
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission, Ministry of Education Hubei Province, South-Central University for Nationalities Wuhan 430074 China
| | - Yi Zeng
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission, Ministry of Education Hubei Province, South-Central University for Nationalities Wuhan 430074 China
| | - Xiong Chen
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission, Ministry of Education Hubei Province, South-Central University for Nationalities Wuhan 430074 China
| | - Ping Xia
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission, Ministry of Education Hubei Province, South-Central University for Nationalities Wuhan 430074 China
| | - Guangyong Xie
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission, Ministry of Education Hubei Province, South-Central University for Nationalities Wuhan 430074 China
| | - Qingliang You
- Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Chemical and Environmental Engineering, Jianghan University Wuhan 430056 China
| | - Li Zhang
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission, Ministry of Education Hubei Province, South-Central University for Nationalities Wuhan 430074 China
| | - Tingcheng Li
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission, Ministry of Education Hubei Province, South-Central University for Nationalities Wuhan 430074 China
| | - Xiangdan Li
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission, Ministry of Education Hubei Province, South-Central University for Nationalities Wuhan 430074 China
| | - Aiqing Zhang
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission, Ministry of Education Hubei Province, South-Central University for Nationalities Wuhan 430074 China
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A novel tridentate [ONS] binuclear titanium complex bearing oxo-bridged macrocyclic structure for ethylene polymerization. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2017.12.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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He X, Deng Y, Jiang X, Wang Z, Yang Y, Han Z, Chen D. Copolymerization of norbornene and butyl methacrylate at elevated temperatures by a single centre nickel catalyst bearing bulky bis(α-diimine) ligand with strong electron-withdrawing groups. Polym Chem 2017. [DOI: 10.1039/c7py00081b] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bis(α-diimine) single nickel(ii) catalyst with strong electron-withdrawing group was applied to catalyze polymerization and copolymerization of norbornene and butyl methacrylate.
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Affiliation(s)
- Xiaohui He
- School of Materials Science and Engineering
- Nanchang University
- Nanchang 330031
- China
| | - Yingjiao Deng
- School of Materials Science and Engineering
- Nanchang University
- Nanchang 330031
- China
| | - Xiong Jiang
- School of Materials Science and Engineering
- Nanchang University
- Nanchang 330031
- China
| | - Zijie Wang
- School of Materials Science and Engineering
- Nanchang University
- Nanchang 330031
- China
| | - Yingping Yang
- School of Materials Science and Engineering
- Nanchang University
- Nanchang 330031
- China
| | - Zhilong Han
- School of Materials Science and Engineering
- Nanchang University
- Nanchang 330031
- China
| | - Defu Chen
- School of Civil Engineering and Architecture
- Nanchang University
- Nanchang 330031
- China
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