Nickel(II) complex catalyzed ring-opening polymerization of lactide. (24th November 2016)

• Record Type: Journal Article
• Authors: Routaray, Anita; Mantri, Somanath; Nath, Nibedita; Sutar, Alekha Kumar; Maharana, Tungabidya
• Is Part Of: Polyhedron. Volume 119(2016)
• Page Start: 335
• Page End: 341
• Publication Date: 2016-11-24
• Subjects: Ring opening polymerization -- Lactide -- Schiff base -- Nickel complex -- PLA; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2016.08.032
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: Salen-type Schiff-base ligands and their nickel complexes have been synthesized and fully characterized. All of the nickel complexes were tested for the ring-opening polymerization of lactide. The PLA produced by the ROP ofl -lactide shows a moderate molecular weight with a narrow PDI range. Abstract: The present manuscript is focused on the synthesis of a series of nickel complexes [Ni-HMBED, Ni-HMBPD and Ni-HMBBD] based on Salen-type Schiff-base ligands and a study of their reactivity for the ring-opening polymerization (ROP) of lactide. These nickel complexes were prepared by the reactions of a nickel solution with one molar equivalent of the Salen-type Schiff-base ligands in methanol under a nitrogen atmosphere. Characterization of these nickel complexes have been carried out by different analytical techniques, which showed a square planar geometry for the Ni atom. The nickel complexes have shown high activity towards the ring-opening polymerization of lactide, with variation in the diamine group. The linear relationship established between the percentage conversion and the number-average molecular weight has confirmed the controlled ROP by the use of the nickel complexes as a catalyst. Finally, a mechanism for the ROP of lactide has been proposed.