Controlling Polymer Topology by Atom Transfer Radical Self-Condensing Vinyl Polymerization of p-(2-Bromoisobutyloylmethyl)styrene

摘要: A new unsymmetrical AB* inimer, p-(2-bromoisobutyloylmethyl)styrene (BiBMS), was applied to the atom transfer radical polymerization (ATRP) prepare a family of polymers with topologies ranging from linear branched. The catalyst system Cu/CuBr2 coupled 2,2′-bipyridine (Bipy) or N,N-bis(2-pyridylmethyl)octylamine (BPMOA) as ligand in toluene anisole at different temperatures, which ensured very low (CuBr) concentration throughout by slow reduction process. First, BiBMS polymerized 0 °C using Cu/CuBr2/BPMOA system; this temperature, initiating activity formed A* frozen and step-growth polymerization, resulting formation polymer (LP1) whose main chain linked ester bonds. Second, 20 Cu/CuBr2/Bipy system. Under condition, initiation B* slow, followed fast poly...