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Copolymerization of CO2 and propylene oxide under rare earth ternary catalyst: design of ligand in yttrium complex
Quan, ZL; Wang, XH; Zhao, XJ; Wang, FS
2003-09-01
Source PublicationPOLYMER
ISSN0032-3861
Volume44Issue:19Pages:5605-5610
AbstractCopolymerization of carbon dioxide and propylene oxide was carried out employing (RC6H4COO)(3)Y/glycerin/ZnEt2 (R = -H, -CH3, NO2, -OH) ternary catalyst systems. The feature of yttrium carboxylates (ligand, substituent and its position on the aromatic ring) is of great importance in the final copolymerization. Appropriate design of substituent and position of the ligand in benzoate-based yttrium complex can adjust the microstructure of aliphatic polycarbonate in a moderate degree, where the head-to-tail linkage in the copolymer is adjustable from 68.4 to 75.4%. The steric factor of the ligand in the yttrium complex is crucial for the molecular weight distribution of the copolymer, probably due to the fact that the substituent at 2 and 4-position would disturb the coordination or insertion of the monomer, lead the copolymer with broad molecular distribution. Based on the study of ultraviolet-visible spectra of the ternary catalyst in various solvents, it seems that the absorption band at 240-255 nm be closely related to the active species of the rare earth ternary catalysts. (C) 2003 Published by Elsevier Ltd.
KeywordCarbon Dioxide Copolymerization Ligand
DOI10.1016/S0032-3861(03)00561-5
Indexed BySCI
Language英语
WOS IDWOS:000185182500016
PublisherELSEVIER SCI LTD
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Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/80408
Collection中国科学院化学研究所
Corresponding AuthorWang, XH
AffiliationChinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
Quan, ZL,Wang, XH,Zhao, XJ,et al. Copolymerization of CO2 and propylene oxide under rare earth ternary catalyst: design of ligand in yttrium complex[J]. POLYMER,2003,44(19):5605-5610.
APA Quan, ZL,Wang, XH,Zhao, XJ,&Wang, FS.(2003).Copolymerization of CO2 and propylene oxide under rare earth ternary catalyst: design of ligand in yttrium complex.POLYMER,44(19),5605-5610.
MLA Quan, ZL,et al."Copolymerization of CO2 and propylene oxide under rare earth ternary catalyst: design of ligand in yttrium complex".POLYMER 44.19(2003):5605-5610.
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