Benzophenone-functionalized, starlilke polystyrenes as organic supports for a tridentate bis(imino)pyridinyliron/trimethylaluminum catalytic system for ethylene polymerization

Abstract : Starlike polystyrenes composed of a microgel core and arms terminated with benzophenone groups were used as organic supports for a tridentate bis(imino)-pyridinyliron catalyst for ethylene polymerization in the presence of trimethylaluminum as a cocatalyst. The microgels were synthesized by the atom transfer radical polymerization of styrene initiated by 4-(1-bromoethyl)-benzophenone, with divinyl-benzene as the crosslinker. The bromine polystyrene chain ends prevented the ethylene polymerization reaction and bad to be removed. This was readily achieved with Cu-0 together with dodecanethiol as a transfer agent. When used as supports in the presence of trimethylaluminum and 2,6-bis[1-2,6(diisopropylphenyl)imino]ethylpyridynyl iron, these bromine-free, functionalized. polystyrene stars enabled the production of polyethylene beads of a spherical morphology and high bulk density with a catalytic activity similar to that under homogeneous reaction conditions. Moreover, the molar mass distribution of the polyethylene was narrow, suggesting limited transfer to trimethylaluminum
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Submitted on : Wednesday, March 18, 2009 - 5:15:24 PM
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Cécile Bouilhac, Henri Cramail, Eric Cloutet, Alain Deffieux, Daniel Taton. Benzophenone-functionalized, starlilke polystyrenes as organic supports for a tridentate bis(imino)pyridinyliron/trimethylaluminum catalytic system for ethylene polymerization. Journal of Polymer Science Part A: Polymer Chemistry, Wiley, 2006, 44 (24), pp.6997-7007. ⟨10.1002/pola.21779⟩. ⟨hal-00369232⟩

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