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Article Dans Une Revue Polymer Chemistry Année : 2012

Control of morphology in olefin polymerization catalyzed by nickel diimine complexes encapsulated into polybutadiene based support

Résumé

commercially available hydroxyl terminated low molecular cis-1,4-polybutadiene was modified by carboxylic functions and used as an effective support in single-site alpha-olefin polymerization. Dynamic light scattering analysis of support solution in heptane confirmed increased ability to self-assembly of modified polybutadienes in the presence of methylaluminoxane cocatalyst (MAO). alpha-Diimine nickel and bis(indenyl) zirconium dichloride catalysts activated by trimethylaluminium or MAO cocatalysts were encapsulated into polymer micellar aggregates and used for ethylene and octadec-1-ene polymerization. Furthermore, the effects of cocatalyst type and concentration on the micelle-formation process, activity and morphology of polyethylene (polyoctadec-1-ene) particles were investigated. In the presence of polybutadiene supports, formation of spherical micrometric PE beads was observed during MAO cocatalyzed ethylene polymerization, whereas the activity of polymerization was not decreased.
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Dates et versions

hal-00762784 , version 1 (07-12-2012)

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Zdenek Hostalek, Jan Merna, Bertrand Heurtefeu, Henri Cramail. Control of morphology in olefin polymerization catalyzed by nickel diimine complexes encapsulated into polybutadiene based support. Polymer Chemistry, 2012, 3 (3), pp.658-6678. ⟨10.1039/c2py00482h⟩. ⟨hal-00762784⟩

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