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Living Copolymerization of Ethylene with Norbornene Mediated by Heteroligated (Salicylaldiminato) (beta-enaminoketonato)Titanium Catalysts
Long, Ying-Yun1,2; Ye, Wei-Ping1,2; Shi, Xin-Cui1,2; Li, Yue-Sheng1
2009-11-15
Source PublicationJOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
ISSN0887-624X
Volume47Issue:22Pages:6072-6082
AbstractThree heteroligated (salicylaldiminato)(beta-enaminoketonato)titanium complexes [3-Bu(t)-2-OC(6)H(3)CH=N(C(6)F(5))][(p-XC(6)H(4))N=C(Bu(t))CHC(CF(3))O]TiCl(2) (3a: X = F, 3b: X = Cl, 3c: X = Br) were synthesized and investigated as the catalysts for ethylene polymerization and ethylene/norbornene copolymerization. In the presence of modified methylaluminoxane as a cocatalyst, these unsymmetric catalysts exhibited high activities toward ethylene polymerization, similar to their parallel parent catalysts. Furthermore, they also displayed favorable ability to efficiently incorporate norbornene into the polymer chains and produce high molecular weight copolymers under the mild conditions, though the copolymerization of ethylene with norbornene leads to relatively lower activities. The sterically open structure of the beta-enaminoketonato ligand is responsible for the high norbornene incorporation. The norbornene concentration in the polymerization medium had a profound influence on the molecular weight distribution of the resulting copolymer. When the norbornene concentration in the feed is higher than 0.4 mol/L, the heteroligated catalysts mediated the living copolymerization of ethylene with norbornene to form narrow molecular weight distribution copolymers (M(w)/M(n) < 1.20), which suggested that chain termination or transfer reaction could be efficiently suppressed via the addition of norbornene into the reaction medium. Polymer yields, catalytic activity, molecular weight, and norbornene incorporation can be controlled within a wide range by the variation of the reaction parameters such as comonomer content in the feed, reaction time, and temperature. (C) 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 6072-6082, 2009
KeywordCatalysts Living Polymerization Polyolefin Ziegler-natta
DOI10.1002/pola.23648
Indexed BySCI
Language英语
WOS IDWOS:000271670000013
PublisherJOHN WILEY & SONS INC
Citation statistics
Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/66700
Collection中国科学院化学研究所
Corresponding AuthorLi, Yue-Sheng
Affiliation1.Chinese Acad Sci, State Key Lab Polymer Phys & Chem, Changchun Inst Appl Chem, Changchun 130022, Peoples R China
2.Chinese Acad Sci, Changchun Branch, Grad Sch, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
Long, Ying-Yun,Ye, Wei-Ping,Shi, Xin-Cui,et al. Living Copolymerization of Ethylene with Norbornene Mediated by Heteroligated (Salicylaldiminato) (beta-enaminoketonato)Titanium Catalysts[J]. JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY,2009,47(22):6072-6082.
APA Long, Ying-Yun,Ye, Wei-Ping,Shi, Xin-Cui,&Li, Yue-Sheng.(2009).Living Copolymerization of Ethylene with Norbornene Mediated by Heteroligated (Salicylaldiminato) (beta-enaminoketonato)Titanium Catalysts.JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY,47(22),6072-6082.
MLA Long, Ying-Yun,et al."Living Copolymerization of Ethylene with Norbornene Mediated by Heteroligated (Salicylaldiminato) (beta-enaminoketonato)Titanium Catalysts".JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY 47.22(2009):6072-6082.
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