Syntheses And Characterizations Of Copper(Ⅱ),Nickel(Ⅱ) Complexes Containing Amino Acid Derivative Ligands And Studys On Their Catalysis For MMA Polymerization

In this paper, copper(Ⅱ) complexes containing amino acids Schiff bases ligands(1), nickel(Ⅱ) complexes containing amino acids Schiff bases ligands(2), a new amino acid derivatives ligands(3)(as seen in the following figure) were synthesized and characterized by EA, FTIR and 1H-NMR.Reverse atom transfer radical polymerization(RATRP) of methyl methacrylate (MMA) have been carried out under the condition using EBIN initiator with copper(Ⅱ) complexes containing amino acids Schiff bases ligands, nickel(Ⅱ) complexes containing amino acids Schiff bases ligands, copper(Ⅱ) complexes containing amino acid derivatives ligands as the catalyst and xylene or acetonitrile as solvent. The structure and properties of products(PMMA) were characterized by FTIR,1H-NMR,13C-NMR and GPC.The vinyl-polymerizations of MMA have been studied in detail by using copper(Ⅱ) complexes containing amino acids Schiff bases ligands, nickel(Ⅱ) complexes containing amino acids Schiff bases ligands, copper(Ⅱ) complexes containing amino acid derivatives ligands catalytic systems. All above catalytic systems were found to be efficient for the polymerization of MMA. We also studied the influence of reaction temperature, reaction time for polymerization of MMA. The experimental results show that the optimum polymerization temperature of MMA using complexes containing amino acids Schiff bases ligands as catalyst was 80℃. At this temperature, extending reaction time can help to increase conversion, and the conversion of copper(Ⅱ) complexes catalytic systems was up to the higest value at 12 hours. It explains the copper(Ⅱ) complexes containing amino acids Schiff bases ligands catalytic systems are excellent for polymerization of MMA at 80℃,12 hours.