Title : Ring opening polymerization of new Schiff base complexes derived from [Bis-(2,6 diisopropylaniline) furfural and 2,2/-oxydianiline
Abstract:
Polycaprolactone (PCL) is one of the biodegradable polymers which have attracted the attentions of the researchers because of its widespread application in the medical arena (as biodegradable implants) and packaging industries. Over the last decade, ring opening polymerization (ROP) of cyclic esters has been the major route to synthesizing these polymers. Coordination chemistry plays a central role in this field by allowing the development of new, efficient, metal-based initiators by manipulation of the coordination environment. In this work, the reaction of 4,4' methylene bis (2,6-diisopropylaniline with one and two equivalent of furfural afforded new Schiff base compounds. The reaction of the new ligands with one or two mole of metals salt gave a new series of transition metal complexes of Fe(II), Co(II), Ni(II), Cu(II) and Zn(II). Also new ligand derived from 2,2/-oxydianiline Schiff-base with their complexes with Fe(II), Co(II) .The new ligands and their prepared complexes were characterized by x-ray single crystal,The new ligands and their prepared complexes were characterized by IR, 1H NMR and CHN analytical techniques. The complexes were screened for their potent activity as catalysts for the ring opening polymerization (ROP) of 3-caprolactone (3-CL). Results revealed that good activity is only achievable at temperatures ≥100°C over the minimum period of 1h. The polymer polydispersities were narrow, and the obtained molecular weights were much lower than calculated values.
