Title of article :
Pyridylphosphine ligands for iron-based atom transfer radical polymerization of methyl methacrylate and styrene
Author/Authors :
Xue، نويسنده , , Zhigang and Lee، نويسنده , , Bae Wook and Noh، نويسنده , , Seok Kyun and Lyoo، نويسنده , , Won Seok، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2007
Pages :
11
From page :
4704
To page :
4714
Abstract :
Two pyridylphosphine ligands, 2-(diphenylphosphino)pyridine (DPPP) and 2-[(diphenylphosphino)methyl]pyridine (DPPMP), were investigated as complexing ligands in the iron-mediated atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) and styrene with various initiators and solvents. In studies of their ATRP behavior, the FeBr2/DPPP catalytic system was a more efficient ATRP catalyst for the MMA polymerization than the other complexes studied in this paper. Most of these systems were well 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) being observed throughout the reactions, and the measured molecular weights matched the predicted values with the DPPP ligand. The polymerization rate of MMA attained a maximum at a ratio of ligand to metal of 2:1 in p-xylene at 80 °C. The polymerization was faster in polar solvents than in p-xylene. The 2-bromopropionitrile (BPN) initiated ATRP of MMA with the FeX2/DPPP catalytic system (X = Cl, Br) was able to be controlled in p-xylene at 80 °C. The polymerization of styrene was able to be controlled using the PECl/FeCl2/DPPP system in DMF at 110 °C.
Keywords :
atom transfer radical polymerization , Iron halide , Pyridylphosphine ligands
Journal title :
Polymer
Serial Year :
2007
Journal title :
Polymer
Record number :
1729827
Link To Document :
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