期刊
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
卷 2013, 期 20, 页码 3533-3541出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201300284
关键词
Ring-opening polymerization; Kinetics; Heterobimetallic complexes; Magnesium; Aluminium; Lactides
资金
- National Natural Science Foundation of China (NSFC) [21071069, 21171078, 21271092]
- State Education Ministry and Fundamental Research Funds of the Central Universities of China [lzujbky-2012-67]
- Project for National Basic Science Personnel Training Fund [J1103307]
Two aluminium and magnesium heterobimetallic complexes of [(LAl)MgOBn]2 (2) and [(LAl)Mg(OC2H4OCH3)]2 (3), in which L = N1,N1,N2,N2-tetrakis(2-hydroxy-3,5-dimethylbenzyl)-1,2-ethanediamine, have been synthesized and characterized by NMR spectroscopy, X-ray crystallography, and elemental analysis. The magnesium alkoxide of complex 2 supported by the bulky aluminium tetraphenolates, as a rare helical heterobimetallic initiator, can effectively initiate the ring-opening polymerization (ROP) of L-lactide (L-LA) leading to polymers with good molecular weight control and narrow molecular weight distributions. Kinetic studies have shown the overall rate expression is -d[lactide]/dt = k[lactide][complex] for the ROP of L-LA. Furthermore, complex 2 shows modest isotactic selectivity in the ROP of rac-lactide.
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