title: A Simplified Fe-Based PhotoATRP Using Only Monomers and Solvent.
abstract: A photoinduced atom transfer radical polymerization (photoATRP) of methacrylates is investigated using air-stable FeBr3as catalyst in the absence of conventional ATRP initiators, additional ligands, reducing agents, and/or radical initiators. The ATRP alkyl halide initiator is formed in situ via photoreduction of FeBr3by methacrylate monomers. The kinetics of the polymerization display a linear semilogarithmic plot after several hours of induction period. The molecular weight can be modulated by additions of different amounts of FeBr3, and polymers have narrow molecular weight distributions. Thus, FeBr3acts as deactivator, as well as a source of activator FeBr2and initiator. This method features a temporal control, and can provide various polymethacrylates with high chain end functionality.
authors.affiliation: Center for Macromolecular Engineering, Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA, 15213, USA.
authors.forename: Xiangcheng
authors.initials: X
authors.lastname: Pan
authors.affiliation: Center for Macromolecular Engineering, Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA, 15213, USA.
authors.forename: Nikhil
authors.initials: N
authors.lastname: Malhotra
authors.affiliation: Center for Macromolecular Engineering, Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA, 15213, USA.
authors.forename: Sajjad
authors.initials: S
authors.lastname: Dadashi-Silab
authors.affiliation: Center for Macromolecular Engineering, Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA, 15213, USA.
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Matyjaszewski
mesh_terms: D002384:Catalysis; D007501:Iron / Q000737:chemistry*; D008689:Methacrylates / Q000138:chemical synthesis*; D058105:Polymerization / Q000528:radiation effects; D011108:Polymers / Q000138:chemical synthesis*; D012997:Solvents / Q000737:chemistry*
chemical_list: D008689:Methacrylates; D011108:Polymers; D012997:Solvents; D007501:Iron
keywords: ATRP; iron; photocatalysts; photoinduced; radical polymerization