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Ethylene Homopolymerizaton and Copolymerizaton by Vanadium(III) Complexes Containing Tridentate or Tetradentate Iminopyrrolyl Ligands
Mu, Jing-Shan; Shi, Xin-Cui; Li, Yue-Sheng
2011-06-15
Source PublicationJOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
ISSN0887-624X
Volume49Issue:12Pages:2700-2708
AbstractIminopyrrolyl vanadium(III) complexes 2a-b bearing tridentate ligands [C(4)H(3)NCH=NC(6)H(4)L]VCl(2)(THF)[L = 2-P(C(6)H(5))(2) (2a), 2-SMe (2b)] and complexes 2c-d with tetradentate ligands [(C(4)H(3)NCH = N)(2)R]VCl(THF) [R = 1,2-C(6)H(4) (2c), 1,2-C(2)H(4) (2d)] have been synthesized in high yields. With diethylaluminium chloride as a cocatalyst, complexes 2a-d were investigated as efficient catalysts for ethylene polymerization under various reaction conditions, and exhibited high catalytic activity and remarkable thermal stability. With these complexes, high molecular weight polymers with unimodal molecular weight distributions were obtained, indicating that the polymerization reaction took place in a single-site nature. Ethylene/1-hexene copolymerizations were also investigated in the presence of Et(2)AlCl. Both increasing ligand denticity and introducing softer atom into the sidearm of the ligands significantly influenced catalytic activity, comonomer incorporation, and the molecular weights of the resultant polymers, suggesting that both the steric and the electronic effects of the ligands played an important role in adjusting chain propagation and transfer rate. The chain transfer mechanisms involved in the copolymerization process were investigated by carefully analyzing the microstructure of the copolymers. The signals of vinyl, disubstituted and tri-substituted vinylene double bond end groups were detected in the copolymer obtained by 2a/Et(2)AlCl system but not in those by 2b-c/Et(2)AlCl systems, indicating that bulky electron- donating group, AP(C(6)H(5))(2), may lead to those unusual transfer reactions. (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: 2700-2708, 2011
KeywordHomogenous Catalysis Polyolefins Ziegler-natta Polymerization
DOI10.1002/pola.24702
Indexed BySCI
Language英语
WOS IDWOS:000290760100019
PublisherWILEY-BLACKWELL
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/72406
Collection中国科学院化学研究所
Corresponding AuthorLi, Yue-Sheng
AffiliationChinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
Mu, Jing-Shan,Shi, Xin-Cui,Li, Yue-Sheng. Ethylene Homopolymerizaton and Copolymerizaton by Vanadium(III) Complexes Containing Tridentate or Tetradentate Iminopyrrolyl Ligands[J]. JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY,2011,49(12):2700-2708.
APA Mu, Jing-Shan,Shi, Xin-Cui,&Li, Yue-Sheng.(2011).Ethylene Homopolymerizaton and Copolymerizaton by Vanadium(III) Complexes Containing Tridentate or Tetradentate Iminopyrrolyl Ligands.JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY,49(12),2700-2708.
MLA Mu, Jing-Shan,et al."Ethylene Homopolymerizaton and Copolymerizaton by Vanadium(III) Complexes Containing Tridentate or Tetradentate Iminopyrrolyl Ligands".JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY 49.12(2011):2700-2708.
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