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Catalysts 2017, 7(2), 64; doi:10.3390/catal7020064

Aluminum Alkyl Complexes Bearing Salicylaldiminato Ligands: Versatile Initiators in the Ring-Opening Polymerization of Cyclic Esters

1
Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, 10044 Stockholm, Sweden
2
Dipartimento di Scienze e Tecnologie, Università del Sannio, via dei Mulini 59/A, 82100 Benevento, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Carl Redshaw
Received: 23 December 2016 / Revised: 7 February 2017 / Accepted: 13 February 2017 / Published: 16 February 2017
View Full-Text   |   Download PDF [1830 KB, uploaded 16 February 2017]   |  

Abstract

Linear aliphatic polyesters are degradable thermoplastic polymers, which can be obtained by ring-opening polymerization (ROP) of cyclic esters through a coordination-insertion mechanism. Aluminum based organometallic complexes have a leading position as efficient catalysts for this polymerization process. Aluminumalkyl complexes bearing salicylaldiminato ligands, although less explored, have been shown to be efficient and versatile catalysts for the ROP of various cyclic esters. These species have the potential to function as active catalysts in the ROP because of their less coordinatively saturated nature with respect to analogous SALEN-type complexes. They have been used as efficient catalysts in the ROP of commercially available cyclic esters, such as ε-caprolactone, l-lactide, rac-lactide, and glycolide. Moreover, they resulted in efficient catalysts for the ROP of cyclic esters with large ring-size and for the ROP of functionalized lactide. Furthermore, they have been used in the co- and ter-polymerization of various cyclic esters affording well controlled polymerization and a plethora of microstructural architectures, ranging from random to block to multiblock. View Full-Text
Keywords: aluminum; ring-opening polymerization; aliphatic poly(esters); poly(lactide); poly(caprolactone); poly(glycolide) aluminum; ring-opening polymerization; aliphatic poly(esters); poly(lactide); poly(caprolactone); poly(glycolide)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Fuoco, T.; Pappalardo, D. Aluminum Alkyl Complexes Bearing Salicylaldiminato Ligands: Versatile Initiators in the Ring-Opening Polymerization of Cyclic Esters. Catalysts 2017, 7, 64.

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