Coupled Atom Transfer Radical Coupling and Atom Transfer Radical Polymerization Approach for Controlled Grafting from Poly( vinylidene fluoride) Backbone

A new grafting from strategy for grafting of different monomers (methacrylates, acrylates, and acrylamide) on poly(vinylidene fluoride) (PVDF) backbone is designed using atom transfer radical coupling (ATRC) and atom transfer radical polymerization (ATRP). 4-Hydroxy TEMPO moieties are anchored on PVDF backbone by ATRC followed by attachment of ATRP initiating sites chosen according to the reactivity of different monomers. High graft conversion is achieved and grafting of poly(methyl methacrylate) (PMMA) exhibits high degree of polymerization (DPn=770) with a very low graft density (0.18 per hundred VDF units) which has been increased to 0.44 by regenerating the active catalyst with the addition of Cu(0). A significant impact on thermal and stress-strain property of graft copolymers on the graft density and graft length is noted. Higher tensile strain and toughness are observed for PVDF-g-PMMA produced from model initiator but graft copolymer from pure PVDF exhibits higher tensile strength and Young's modulus. (c) 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 995-1008