Role of Tridentate Schiff Base and Methoxyethylindenyl Derivatives of Lanthanocene Complexes for the Synthesis of High Molecular Weight Polymethyl Methacrylate (PMMA)

Authors : Muhammad Yousaf, Aftab Ahmad Chatha, Abdul Jabbar

Pages : 471-477

View : 15 | Download : 8

Publication Date : 9999-12-31

Article Type : Makaleler

Abstract :Different mixed ligand lanthanocene complexes along with Al(i-Bu)3 are capable of synthesizing partially syndiotactic high molecular weight polymethylmethacrylate. The Schiff base derivative of mixed ligand lanthanocene complexes (1-4) showed better efficiency (Mv = 227 \times 103-354 \times 103) compared to the methoxyethylindenyl derivative of mixed ligand lanthanocene complexes (5-9) (Mv = 72 \times 103, 172 \times 103). The effects of the catalyst, temperature, catalyst/MMA molar ratio, and catalyst/Al(i-Bu)3 molar ratio on the polymerization of MMA at 60 °C suggested that ligand size and radius of rare earth metals play an important role in determining the activity of the catalyst.
Keywords : Tridentate Schiff base, lanthanocene, methoxyethylindene lanthanocene, MMA, polymerization