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

被引:71
作者
Fuoco, Tiziana [1 ]
Pappalardo, Daniela [1 ,2 ]
机构
[1] KTH Royal Inst Technol, Dept Fibre & Polymer Technol, S-10044 Stockholm, Sweden
[2] Univ Sannio, Dipartimento Sci & Tecnol, Via Mulini 59-A, I-82100 Benevento, Italy
来源
CATALYSTS | 2017年 / 7卷 / 02期
关键词
aluminum; ring-opening polymerization; aliphatic poly(esters); poly(lactide); poly(caprolactone); poly(glycolide); PHENOXY-IMINE LIGANDS; HALF-SALEN COMPLEXES; EPSILON-CAPROLACTONE; AL COMPLEXES; L-LACTIDE; DIMETHYL(SALICYLALDIMINATO)ALUMINUM COMPOUNDS; CATALYTIC-ACTIVITY; POROUS SCAFFOLDS; RACEMIC LACTIDE; CHELATE LIGANDS;
D O I
10.3390/catal7020064
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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 epsilon-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.
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页数:17
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