Salicylaldimine Copper(II) complex catalyst: Pioneer for ring opening Polymerization of Lactide

Journal of Chemical Sciences

NIBEDITA NATH¹  ANITA ROUTARAY¹  TUNGABIDYA MAHARANA2²  JAYA PRAKASH DAS¹  ALEKHA KUMAR SUTAR1¹  PRATAP KUMAR SAHOO³ 

[1] Catalysis Research Lab, Department of Chemistry, Ravenshaw University, Cuttack, Odisha, 753 003, India$$;Department of Chemistry, National Institute of Technology, Raipur, 492 010, India$$;School of Physical Sciences, National Institute of Science Education and Research, Bhubaneswar, Odisha, 751 005, India$$

关键词: Ring opening polymerization (ROP);    Lactide;    Salicylaldimine;    copper complex;    PLA.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

Salicylaldimine copper complex has been synthesized and its reactivity for the ring-opening polymerization(ROP) of lactide has been studied. This monomeric copper complex was prepared by the reaction ofcopper(II) solution with one molar equivalent of salicylaldimine Schiff-base ligand in methanol under nitrogenatmosphere. This copper complex has been characterized by different spectroscopic methods, which showedsquare planar geometry. The molecular structure of the salicylaldimine Schiff-base has been determined byX-ray diffraction studies. The complex was tested as the initiator for the ring-opening polymerization of lactide,with variation in diamine group in ligand. The rate of polymerization is dependent on the diamine groupin the following order: ethylene > propylene > phenyl. The salicylaldimine copper complex allows controlledring-opening polymerization as indicated by the linear relationship between the percentage conversion and thenumber-average molecular weight. On the basis of literature reports, a mechanism for ROP of lactide has beenproposed.

【 授权许可】

Unknown