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- Title
Ring-opening polymerization of ε-caprolactone by a new yttrium complex: Y[2,2′-ethylidene-bis(4,6-di- tert-butylphenoxy)]<sub>2</sub>(ethylene glycol dimethyl ether)Na(ethylene glycol dimethyl ether)<sub>3</sub>.
- Authors
Wu, Guangming; Liu, Jiachu; Sun, Weilin; Shen, Zhiquan; Ni, Xufeng
- Abstract
The main aims of the work reported here were to synthesize and characterize a new 2,2′-ethylidene-bis(4,6-di- tert-butylphenol) (EDBPH2)-based bimetal yttrium complex, Y(EDBP)2(DME)Na(DME)3 (1c; where DME is ethylene glycol dimethyl ether), which was employed as an efficient initiator for the ring-opening polymerization of ε-caprolactone (ε-CL). From single-crystal X-ray diffraction, the solid structure of this new bimetal initiator was well established. Experimental results show that 1c initiates the ring-opening polymerization of ε-CL to afford poly(ε-CL) with a narrow molecular weight distribution ( Mw/ Mn = 1.09-1.36, 65 °C). Based on an in situ NMR study, a plausible coordination-insertion mechanism is then proposed. The bimetal complex 1c can be used as an initiator for the ring-opening polymerization of ε-CL with some living characteristics. A study of the mechanism reveals that DME displacement in 1c by ε-CL is involved in the initiation process and the propagation may proceed through three pathways by NaO insertion or YO insertion. Copyright © 2009 Society of Chemical Industry
- Subjects
YTTRIUM; POLYMERIZATION; LAMINATED metals; CRYSTALS; X-ray diffraction
- Publication
Polymer International, 2010, Vol 59, Issue 4, p431
- ISSN
0959-8103
- Publication type
Article
- DOI
10.1002/pi.2708