期刊
DALTON TRANSACTIONS
卷 44, 期 5, 页码 2157-2165出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4dt02616k
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资金
- Italian Ministry of University and Research
Aluminum complexes of non-chiral-salalen ligands were investigated in the catalysis of ring-opening polymerization (ROP) of lactide and epsilon-caprolactone and in their copolymerization. The aluminum-salalen complexes were found to polymerize all varieties of lactide, namely: L-, D-, rac- and meso-lactide, and showed moderate productivities. rac-LA gave rise to isotactic polylactides (with P-m up to 72%), while meso-LA gave rise to heterotactic polylactides (with a P-m of 79%). An experiment was designed for distinguishing between chain-end control and enantiomorphic-site control combined with polymeryl exchange for the isotactic stereoblock microstructure observed for the PLA produced from rac-LA; it gave strong evidence for polymeryl exchange between propagating species. Finally, this class of catalysts promoted the copolymerization of epsilon-caprolactone and lactides. In particular, compound 2b allowed controlled random copolymerization of epsilon-caprolactone and L-lactide.
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