| 초록 |
ABSTRACT: Two pyridylphosphine ligands, 2-(diphenylphosphino)pyridine and 2-[(diphenylphosphino)methyl]pyridine, were investigated as novel complexing ligands in iron-mediated atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) with various initiators and solvents. In studies of their ATRP behaviour, FeBr2/DPPP catalytic system was more efficient ATRP catalyst for MMA polymerization than other complexes studied on this paper. Most of these systems were controlled with a linear increase in the number average molecular weights (Mn) vs conversion and relatively low molecular weight distributions (Mw/Mn = 1.15-1.3) throughout the reactions, and the measured molecular weights matched the predicted values with DPPP ligand.The polymerization rate of MMA attained a maximum at 2:1 ratio of ligand to metal in p-xylene at 80℃. The polymerization was faster in polar solvents, as compared to p-xylene. |
