Indexed by:
期刊论文
First Author:
Liu, Jie
Correspondence Author:
Lu, XB (reprint author), Dalian Univ Technol, State Key Lab Fine Chem, Coll Chem, 2 Linggong Rd, Dalian 116024, Peoples R China.
Co-author:
Bao, Yuan-Ye,Liu, Ye,Ren, Wei-Min,Lu, Xiao-Bing
Date of Publication:
2013-03-07
Journal:
POLYMER CHEMISTRY
Included Journals:
SCIE、EI、Scopus
Document Type:
J
Volume:
4
Issue:
5
Page Number:
1439-1444
ISSN No.:
1759-9954
Abstract:
Mono- and bi-nuclear chromium(III)-salan complexes are efficient catalysts for the alternating copolymerization of terminal epoxides [such as epichlorohydrin (CIPO) and glycidyl phenyl ether (GO)] and cyclic anhydrides [e.g. maleic anhydride (MA) and succinic anhydride (SA)] to afford the corresponding copolymers with >99% ester content. The binuclear complex c bearing a binaphthol linker showed significantly higher activity than the mononuclear chromium-salan complexes a and b. For example, the catalytic activities (based on chromium concentration) of complex c for MA/CIPO and MA/GO copolymerizations are 4.1 and 7.1 times that of complex a, respectively. An intramolecular bimetallic synergistic effect, in which the alternating chain-growth and dissociation of propagating copolymer species take turns at the two metal ions of the binuclear catalyst c, was suggested to make a contribution to the enhanced catalytic activity. Importantly, when using the binuclear complex c as a catalyst for MA/(S)-GO copolymerization, a highly regioregular ring-opening step was observed with a concomitant >99% retention of configuration at the methine carbon center of epoxide incorporated into the polyester.
Translation or Not:
no
