Abstract
A number of unreported salen aluminum complexes bearing Schiff base ligands starting from (R,R)-1,2-diammoniumcyclohexane mono-(+)-tartrate salt were synthesized. These complexes were characterized by 1H, 13C NMR, and elemental analysis. These complexes were employed as initiators for the ring-opening polymerization (ROP) of L-lactide and rac-lactide. Complex 3 (R = Br) showed the highest activity for the ROP of L-lactide among these complexes, and complex 2 (R = iPr) possessed the highest stereoselectivity for the ROP of rac-lactide among these aluminum isopropoxides. The kinetics studies of the polymerization employed complex 2 as initiator indicated that the polymerization rate was first-ordered in lactide and initiator.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (grant number 21204082); the Project for Science and Technology Development of Jilin Science & Technology Department, Jilin province, China (grant number 20140204017GX); the Science and Technology Bureau of Changchun City, China (grant number 2013060); and Training Programs of Innovation and Entrepreneurship for Undergraduates (No. 2015X094).
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Zuwang Wen and Dongni Li contributed equally to this work.
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Wen, Z., Li, D., Qi, J. et al. Effect of the phenyl ring substituent on stereoselectivity in the ring-opening polymerization of the rac-lactide initiated by salen aluminum complexes. Colloid Polym Sci 293, 3449–3457 (2015). https://doi.org/10.1007/s00396-015-3720-7
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DOI: https://doi.org/10.1007/s00396-015-3720-7