Issue 121, 2015

Comparing l-lactide and ε-caprolactone polymerization by using aluminum complexes bearing ketiminate ligands: steric, electronic, and chelating effects

Abstract

Our previous studies on the ring-opening polymerization of ε-caprolactone using aluminum complexes bearing ketimine ligands as pre-catalysts with benzyl alcohol as an initiator clearly showed how the steric, electronic and chelating effects influenced the polymerization rate. Herein, the L-lactide polymerization rate of a series of Al complexes bearing ketimine ligands was also investigated, and the polymerization characteristics between L-lactide and ε-caprolactone were compared. The kinetic results revealed complexes with more steric hindrance ligands that demonstrated greater propagation activity of the CL polymerization; however, an opposite trend was obtained in the L-lactide polymerization because of the larger size of L-lactide hindering its coordination with Al atoms in the crowded surroundings. The electron-withdrawing group of ligands, or less chelating ligands, demonstrated greater propagation activity both in L-lactide and ε-caprolactone polymerization.

Graphical abstract: Comparing l-lactide and ε-caprolactone polymerization by using aluminum complexes bearing ketiminate ligands: steric, electronic, and chelating effects

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
04 Aug 2015
Accepted
05 Nov 2015
First published
05 Nov 2015

RSC Adv., 2015,5, 100272-100280

Author version available

Comparing L-lactide and ε-caprolactone polymerization by using aluminum complexes bearing ketiminate ligands: steric, electronic, and chelating effects

Y. Chen, Y. Chen, H. Tseng, C. Lian, H. Tsai, Y. Lai, S. C. N. Hsu, M. Y. Chiang and H. Chen, RSC Adv., 2015, 5, 100272 DOI: 10.1039/C5RA15530D

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