Polymerization of norbornene using novel palladium carboxylate/boron trifluoride etherate catalyst system

The vinyl polymerization of norbornene with Pd(carboxylate)(2)/BF3OEt2 catalyst system has been investigated by varying the molar cocatalyst/metal ratio, the norbornene/metal ratio, the metal concentration and the reaction temperature. The effects on the catalyst activity were explained on the basis of complexation equilibrium for the active homogeneous complex. A "particular" activity of 154 100 kg NB per mole Pd for an hour has been achieved at B/Pd = 25 and 25 degrees C. The molecular weights M-w from 77 700 to 293 800 g/mol and glass transition temperatures T-g from 240 to 262 degrees C were observed for the representative samples of polynorbornene. The molar mass distribution indicates a single-site, highly homogeneous character of the active catalyst species. Catalytic activity and polymer molecular weight can be controlled by varying the reaction parameters over a wide range. NMR and IR spectroscopic studies of the polymer showed 2,3-enchained repeating units of polymer backbone with low diisotacticity. The simplicity of catalyst system composition might be of industrial importance. (c) 2006 Elsevier Ltd. All rights reserved.
Publisher
Elsevier Sci Ltd
Issue Date
2006-12
Language
ENG
Keywords

VINYL-TYPE POLYMERIZATION; ADDITION POLYMERIZATION; NICKEL-COMPLEXES; METAL-CATALYSTS; LIGANDS; DERIVATIVES; TRIS(PENTAFLUOROPHENYL)BORANE; HOMOPOLYMERIZATION; POLYNORBORNENE; ACTIVATION

Citation

POLYMER, v.47, no.26, pp.8474 - 8479

ISSN
0032-3861
DOI
10.1016/j.polymer.2006.10.009
URI
http://hdl.handle.net/10203/3518
Appears in Collection
CBE-Journal Papers(저널논문)
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